UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM 10-Q

(Mark One)

   (X)   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
         For the quarterly period ended June 30, 2004

                                       OR

   ( )   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
         For the transition period from             to
                                        -----------     -----------

                          Commission File Number 1-8864

                                 USG CORPORATION
- ------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

               Delaware                                    36-3329400
- ------------------------------------------------------------------------------
      (State or other jurisdiction of                   (I.R.S. Employer
       incorporation or organization)                  Identification No.)

 125 South Franklin Street, Chicago, Illinois              60606-4678
- ------------------------------------------------------------------------------
 (Address of principal executive offices)                  (Zip code)

Registrant's telephone number, including area code        (312) 606-4000

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes   X   No
                                       -----    -----

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes   X   No
                                         -----    -----

Indicate by check mark whether the registrant has filed all documents and
reports required to be filed by Section 12, 13, or 15(d) of the Securities
Exchange Act of 1934 subsequent to the distribution of securities under a plan
confirmed by a court. Yes   X   No
                          -----    -----

As of June 30, 2004, 43,015,424 shares of USG common stock were outstanding.



                                TABLE OF CONTENTS



                                                               Page
                                                               ----
                                                            
PART I  FINANCIAL INFORMATION

Item 1. Financial Statements:

        Consolidated Statements of Earnings:
            Three Months and Six Months
            Ended June 30, 2004 and 2003                         3

        Consolidated Balance Sheets:
            As of June 30, 2004 and December 31, 2003            4

        Consolidated Statements of Cash Flows:
            Six Months Ended June 30, 2004 and 2003              5

        Notes to Consolidated Financial Statements               6

Item 2. Management's Discussion and Analysis of Results
          of Operations and Financial Condition                 38

Item 4. Controls and Procedures                                 50

Report of Independent Registered Public Accounting Firm         51

PART II  OTHER INFORMATION

Item 1. Legal Proceedings                                       53

Item 2. Changes in Securities, Use of Proceeds and/or Issuer
          Purchases of Equity Securities                        53

Item 4. Submission of Matters to a Vote of Security Holders     54

Item 6. Exhibits and Reports on Form 8-K                        55

Signatures                                                      56


                                      -2-


PART I      FINANCIAL INFORMATION
ITEM 1.     FINANCIAL STATEMENTS

                                 USG CORPORATION
                       CONSOLIDATED STATEMENTS OF EARNINGS
                   (DOLLARS IN MILLIONS EXCEPT PER-SHARE DATA)
                                   (UNAUDITED)



                                               THREE MONTHS                       SIX MONTHS
                                              ENDED JUNE 30,                     ENDED JUNE 30,
                                       -----------------------------     -----------------------------
                                           2004             2003             2004             2003
                                       ------------     ------------     ------------     ------------
                                                                              
Net sales                              $      1,145     $        914     $      2,165     $      1,776
Cost of products sold                           929              780            1,778            1,525
Selling and administrative expenses              79               81              156              161
Chapter 11 reorganization expenses                4                3                6                5
                                       ------------     ------------     ------------     ------------
Operating profit                                133               50              225               85
Interest expense                                  1                2                2                3
Interest income                                  (1)              (1)              (2)              (2)
Other income, net                                 1               (5)               3               (5)
                                       ------------     ------------     ------------     ------------
Earnings before income taxes and
cumulative effect of accounting
change                                          132               54              222               89
Income taxes                                     52               23               85               36
                                       ------------     ------------     ------------     ------------
Earnings before cumulative effect
of accounting change                             80               31              137               53
                                       ------------     ------------     ------------     ------------
Cumulative effect of accounting
change, net of tax                                -                -                -              (16)
                                       ------------     ------------     ------------     ------------
Net earnings                                     80               31              137               37
                                       ============     ============     ============     ============

EARNINGS PER COMMON SHARE:
  Basic and diluted before
  cumulative effect of accounting
  change                                       1.86             0.73             3.18             1.24

  Cumulative effect of accounting
  change                                          -                -                -            (0.37)
                                       ------------     ------------     ------------     ------------
  Basic and diluted                            1.86             0.73             3.18             0.86
                                       ============     ============     ============     ============

Dividends paid per common share                   -                -                -                -
Average common shares                    43,017,068       43,045,854       43,020,344       43,097,190
Average diluted common shares            43,017,971       43,045,854       43,021,448       43,097,190


See accompanying Notes to Consolidated Financial Statements.

                                      -3-


                                 USG CORPORATION
                           CONSOLIDATED BALANCE SHEETS
                              (DOLLARS IN MILLIONS)
                                   (UNAUDITED)



                                                      AS OF          AS OF
                                                     JUNE 30,     DECEMBER 31,
                                                       2004           2003
                                                     --------    -------------
                                                           
ASSETS
Current Assets:
Cash and cash equivalents                            $    664      $    700
Short-term marketable securities                           65            64
Restricted cash                                            33             7
Receivables (net of reserves - $15 and $15)               488           321
Inventories                                               357           280
Income taxes receivable                                    24            26
Deferred income taxes                                      44            43
Other current assets                                       56            57
                                                     --------      --------
Total current assets                                    1,731         1,498

Long-term marketable securities                           211           176
Property, plant and equipment (net of accumulated
      depreciation and depletion - $862 and $816)       1,800         1,818
Deferred income taxes                                     148           178
Goodwill                                                   41            39
Other assets                                              103            90
                                                     --------      --------
Total Assets                                            4,034         3,799
                                                     ========      ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable                                          274           202
Accrued expenses                                          203           206
Current portion of long-term debt                           1             1
Income taxes payable                                       27             5
                                                     --------      --------
Total current liabilities                                 505           414

Long-term debt                                              1             1
Deferred income taxes                                      23            23
Other liabilities                                         442           429
Liabilities subject to compromise                       2,240         2,243

Commitments and contingencies

Stockholders' Equity:
Preferred stock                                             -             -
Common stock                                                5             5
Treasury stock                                           (258)         (258)
Capital received in excess of par value                   414           414
Accumulated other comprehensive income (loss)              (4)           (1)
Retained earnings                                         666           529
                                                     --------      --------
Total stockholders' equity                                823           689
                                                     --------      --------
Total Liabilities and Stockholders' Equity              4,034         3,799
                                                     ========      ========


See accompanying Notes to Consolidated Financial Statements.

                                      -4-


                                 USG CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                              (DOLLARS IN MILLIONS)
                                   (UNAUDITED)



                                                          SIX MONTHS
                                                        ENDED JUNE 30,
                                                        ---------------
                                                        2004      2003
                                                        -----     -----
                                                            
OPERATING ACTIVITIES:
Net earnings                                            $ 137     $  37
Adjustments to reconcile net earnings to net cash:
    Cumulative effect of accounting change                  -        16
    Depreciation, depletion and amortization               55        52
    Deferred income taxes                                  25        18
    (Gain) loss on asset dispositions                      (1)        -
   (Increase) decrease in working capital:
     Receivables                                         (167)      (85)
     Income taxes receivable                                2         3
     Inventories                                          (77)      (17)
     Payables                                              94        32
     Accrued expenses                                      (3)      (55)
(Increase) decrease in other assets                        (6)      (12)
Increase (decrease) in other liabilities                   12         5
Change in asbestos receivable                              11        19
Decrease in liabilities subject to compromise              (3)      (17)
Other, net                                                 (8)        -
                                                        -----     -----
Net cash provided by (used for) operating activities       71        (4)
                                                        -----     -----
INVESTING ACTIVITIES:
Capital expenditures                                      (47)      (36)
Purchases of marketable securities                       (171)     (148)
Sales or maturities of marketable securities              135        91
Net proceeds from asset dispositions                        6         -
Acquisition of business                                    (4)       (2)
                                                        -----     -----
Net cash used for investing activities                    (81)      (95)
                                                        -----     -----
FINANCING ACTIVITIES:
Deposit of restricted cash                                (26)      (21)
                                                        -----     -----
Net cash used for financing activities                    (26)      (21)
                                                        -----     -----

Net decrease in cash and cash equivalents                 (36)     (120)

Cash and cash equivalents at beginning of period          700       649
                                                        -----     -----
Cash and cash equivalents at end of period                664       529
                                                        =====     =====
SUPPLEMENTAL CASH FLOW DISCLOSURES:
Interest paid                                               1         1
Income taxes paid, net                                     32         9


See accompanying Notes to Consolidated Financial Statements.

                                      -5-


                                 USG CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                   (UNAUDITED)

(1)   PREPARATION OF FINANCIAL STATEMENTS

      The accompanying unaudited consolidated financial statements of USG
      Corporation ("the Corporation") have been prepared in accordance with
      applicable United States Securities and Exchange Commission guidelines
      pertaining to interim financial information. The preparation of financial
      statements in conformity with accounting principles generally accepted in
      the United States of America requires management to make estimates and
      assumptions that affect the reported amounts of assets, liabilities,
      revenues and expenses. Actual results could differ from those estimates.
      In the opinion of management, the financial statements reflect all
      adjustments, which are of a normal recurring nature, necessary for a fair
      presentation of the Corporation's financial results for the interim
      periods. These financial statements and notes are to be read in
      conjunction with the financial statements and notes included in the
      Corporation's 2003 Annual Report on Form 10-K which was filed on February
      24, 2004.

(2)   VOLUNTARY REORGANIZATION UNDER CHAPTER 11

      On June 25, 2001 (the "Petition Date"), the Corporation and the 10 United
      States subsidiaries listed below (collectively, the "Debtors") filed
      voluntary petitions for reorganization (the "Filing") under chapter 11 of
      the United States Bankruptcy Code (the "Bankruptcy Code") in the United
      States Bankruptcy Court for the District of Delaware (the "Bankruptcy
      Court"). This action was taken to resolve asbestos claims in a fair and
      equitable manner, to protect the long-term value of the Debtors'
      businesses, and to maintain the Debtors' leadership positions in their
      markets.

      The chapter 11 cases of the Debtors (collectively, the "Chapter 11 Cases")
      are being jointly administered as In re: USG Corporation et al. (Case No.
      01-2094). The Chapter 11 Cases do not include any of the Corporation's
      non-U.S. subsidiaries. The following subsidiaries filed chapter 11
      petitions: United States Gypsum Company ("U.S. Gypsum"); USG Interiors,
      Inc. ("USG Interiors"); USG Interiors International, Inc.; L&W Supply
      Corporation ("L&W Supply"); Beadex Manufacturing, LLC; B-R Pipeline
      Company; La Mirada Products Co., Inc.; Stocking Specialists, Inc.; USG
      Industries, Inc.; and USG Pipeline Company.

      The background of asbestos litigation, developments in the Corporation's
      reorganization proceeding and estimated cost are discussed in Note 13.
      Litigation.

                                      -6-


      CONSEQUENCES OF THE FILING

      As a consequence of the Filing, all asbestos lawsuits and other lawsuits
      pending against the Debtors as of the Petition Date are stayed, and no
      party may take any action to pursue or collect pre-petition claims except
      pursuant to an order of the Bankruptcy Court. Since the Filing, the
      Debtors have ceased making both cash payments and accruals with respect to
      asbestos lawsuits, including cash payments and accruals pursuant to
      settlements of asbestos lawsuits. The Debtors are operating their
      businesses without interruption as debtors-in-possession subject to the
      provisions of the Bankruptcy Code, and vendors are being paid for goods
      furnished and services provided after the Filing.

      The Debtors' Chapter 11 Cases are currently assigned to Judge Judith K.
      Fitzgerald, a bankruptcy court judge sitting in the United States
      Bankruptcy Court for the District of Delaware. Three creditors'
      committees, one representing asbestos personal injury claimants, another
      representing asbestos property damage claimants, and a third representing
      unsecured creditors, were appointed as official committees in the Chapter
      11 Cases. The Bankruptcy Court also appointed Dean M. Trafelet as the
      legal representative for future asbestos claimants in the Debtors'
      bankruptcy proceeding. Mr. Trafelet was formerly a judge of the Circuit
      Court of Cook County, Illinois. The appointed committees, together with
      Mr. Trafelet, will play significant roles in the Chapter 11 Cases and
      resolution of the terms of any plan of reorganization.

      The Debtors intend to address their liability for all present and future
      asbestos claims, as well as all other pre-petition claims, in a plan or
      plans of reorganization approved by the Bankruptcy Court. The Debtors
      currently have the exclusive right to file a plan of reorganization until
      December 1, 2004. The Debtors may seek one or more additional extensions
      of the exclusivity period depending upon developments in the Chapter 11
      Cases.

      The plan of reorganization ultimately approved by the Bankruptcy Court in
      the Chapter 11 Cases may include one or more independently administered
      trusts under Section 524(g) of the Bankruptcy Code, which may be funded by
      the Debtors to allow payment of present and future asbestos personal
      injury claims and demands. Under the Bankruptcy Code, a plan of
      reorganization creating a Section 524(g) trust may be confirmed only if
      75% of the asbestos claimants who vote on the plan approve the plan. A
      plan of reorganization, including a plan creating a Section 524(g) trust,
      may be confirmed without the consent of non-asbestos creditors and equity
      security holders if certain requirements of the Bankruptcy Code are met.

      The Debtors also expect that the plan of reorganization will address the
      Debtors' liability for asbestos property damage claims, whether by
      including those liabilities in a Section 524(g) trust or by other means.

      If the confirmed plan of reorganization includes the creation and funding
      of a Section 524(g) trust, the Bankruptcy Court will issue a permanent

                                      -7-


      injunction barring the assertion of present and future asbestos claims
      against the Debtors, their successors, and their affiliates, and
      channeling those claims to the trust for payment in whole or in part.

      Similar plans of reorganization containing Section 524(g) trusts have been
      confirmed in the chapter 11 cases of other companies with asbestos
      liabilities, but there is no guarantee that the Bankruptcy Court in the
      Debtors' Chapter 11 Cases will approve creation of a Section 524(g) trust
      or issue a permanent injunction channeling to the trust all asbestos
      claims against the Debtors and/or their successors and affiliates. In
      addition, if federal legislation addressing asbestos personal injury
      claims is passed, which is extremely unpredictable at this time, such
      legislation may affect the amount that will be required to resolve the
      Debtors' asbestos personal injury liability in the Chapter 11 Cases and
      may affect whether the Debtors establish a trust under Section 524(g). See
      Potential Federal Legislation Regarding Asbestos Personal Injury Claims,
      below.

      A key factor in determining the recovery of pre-petition creditors and
      stockholders under any plan of reorganization is the amount that must be
      provided in the plan to resolve the Debtors' liability for present and
      future asbestos claims. Counsel for the Official Committee of Asbestos
      Personal Injury Claimants and counsel for the legal representative for
      future asbestos personal injury claimants have stated that the Debtors'
      liabilities for present and future asbestos claims exceed the value of the
      Debtors' assets and that the Debtors are insolvent. The Debtors have
      stated that they believe they are solvent if their asbestos liabilities
      are fairly and appropriately valued.

      The Debtors' asbestos liabilities to be funded under a plan of
      reorganization have not yet been determined and are subject to substantial
      dispute and uncertainty. While it is the Debtors' intention to seek a full
      recovery for their creditors, it is not possible to predict the amount
      that will have to be provided in the plan of reorganization to resolve
      present and future asbestos claims, how the plan of reorganization will
      treat other pre-petition claims, whether there will be sufficient assets
      to satisfy the Debtors' pre-petition liabilities, and what impact any plan
      may have on the value of the shares of the Corporation's common stock and
      other outstanding securities. The payment rights and other entitlements of
      pre-petition creditors and the Corporation's shareholders may be
      substantially altered by any plan of reorganization confirmed in the
      Chapter 11 Cases. Pre-petition creditors may receive under the plan of
      reorganization less than 100% of the face value of their claims, the
      pre-petition creditors of some Debtors may be treated differently from the
      pre-petition creditors of other Debtors, and the interests of the
      Corporation's stockholders are likely to be substantially diluted or
      cancelled in whole or in part. There can be no assurance as to the value
      of any distributions that might be made under any plan of reorganization
      with respect to such pre-petition claims, equity interests, or other
      outstanding securities.

                                      -8-


      It is also not possible to predict how the plan of reorganization will
      treat intercompany indebtedness, licenses, transfers of goods and
      services, and other intercompany arrangements, transactions and
      relationships that were entered into before the Petition Date. These
      arrangements, transactions and relationships may be challenged by various
      parties in the Chapter 11 Cases, and the outcome of those challenges, if
      any, may have an impact on the treatment of various claims under any plan
      of reorganization.

      In connection with the Filing, the Corporation implemented a Bankruptcy
      Court-approved key employee retention plan that commenced on July 1, 2001,
      and continued until June 30, 2004. Under the plan, participants received
      semi-annual payments that began in January 2002. Expenses associated with
      this plan amounted to $2.6 million and $5.3 million in the second quarter
      and first six months of 2004, respectively. For the comparable 2003
      periods, expenses totaled $5.5 million and $11.1 million. The lower level
      of expense in 2004 reflected a provision of the plan that required the
      recording in earlier periods of deferred amounts included in the final
      payment.

      The key employee retention plan, in an amended form, has been extended
      until December 31, 2005. The amendments introduce a performance feature
      for the last two (of four) payments to be made under the extended plan.
      The cost of the extended plan is projected to be approximately $9.8
      million during the second half of 2004 and $19.6 million for the full year
      2005 before taking into account the performance feature which could add up
      to 25% to the final two payments or eliminate them altogether. Because of
      the performance feature, expense in 2005 could range from a low of
      approximately $7.0 million (assuming failure to meet the performance
      target which would result in the final two payments being eliminated) to a
      maximum of approximately $22.7 million (assuming full attainment of the
      performance target).

      POTENTIAL FEDERAL LEGISLATION REGARDING ASBESTOS PERSONAL INJURY CLAIMS

      The Corporation has for many years actively supported proposals for
      federal legislation addressing asbestos personal injury claims. On April
      7, 2004, the Fairness in Asbestos Injury Resolution Act of 2004 (Senate
      Bill 2290, the "FAIR Bill") was introduced in the United States Senate.
      The FAIR Bill has not been approved by the Senate, has not been introduced
      in the House of Representatives, and is not law.

      The FAIR Bill introduced in the Senate is intended to establish a
      nationally administered trust fund to compensate asbestos personal injury
      claimants. In the FAIR Bill's current form, companies that have made past
      payments for asbestos personal injury claims would be required to
      contribute amounts to a national trust fund on a periodic basis that would
      pay the claims of qualifying asbestos personal injury claimants. The
      nationally administered trust fund would be the exclusive remedy for
      asbestos personal injury claims, and such claims could not be brought in
      state or federal court as long as such claims are being compensated under

                                      -9-


      the national trust fund.

      In the FAIR Bill's current form, the amounts to be paid to the national
      trust fund are based on an allocation methodology set forth in the FAIR
      Bill. The amounts that participants, including the Debtors, would be
      required to pay are not dischargeable in a bankruptcy proceeding. The FAIR
      Bill also provides, among other things, that the national trust fund shall
      cease paying new claims if it is determined that the money in the fund is
      not sufficient to compensate eligible claimants. In such a case, under the
      terms of the current FAIR Bill, the claimants and defendants would return
      to the federal court system to resolve claims not paid by the national
      trust fund. The text of the FAIR Bill as introduced in the Senate may be
      found at http://thomas.loc.gov (type in bill number "S.2290").

      Enactment of the FAIR Bill or similar legislation addressing the financial
      contributions of the Debtors for asbestos personal injury claims would
      have a material impact on the amount of the Debtors' asbestos personal
      injury liability and Debtors' Chapter 11 Cases.

      The outcome of the legislative process, however, is inherently
      speculative, and it cannot be known whether the FAIR Bill or similar
      legislation will ever be enacted or, even if enacted, what the terms of
      the final legislation might be. Many labor organizations, including the
      AFL-CIO, as well as some Senators, have indicated that they oppose the
      FAIR Bill as introduced because, among other things, they believe that the
      FAIR Bill does not provide sufficient compensation to asbestos claimants.
      On April 22, 2004, the Senate defeated a motion to proceed with floor
      consideration of the FAIR Bill. Discussions continue regarding possible
      revisions to the FAIR Bill that would allow it to move forward, but it is
      unclear whether these discussions will produce agreements on key issues.
      It is likely that even if the FAIR Bill is enacted, the terms of the
      enacted legislation will be different from the current FAIR Bill, and
      those differences may be material to the FAIR Bill's impact on the
      Corporation.

      During the legislative process, proceedings in the Chapter 11 Cases will
      continue. See Consequences of the Filing, above, and Note 13. Litigation.

      PRE-PETITION LIABILITIES OTHER THAN ASBESTOS-RELATED CLAIMS

      Subsequent to the Filing, the Debtors received approval from the
      Bankruptcy Court to pay or otherwise honor certain of their pre-petition
      obligations, including employee wages, salaries, benefits and other
      employee obligations, and from limited available funds, pre-petition
      claims of certain critical vendors, real estate taxes, environmental
      obligations, certain customer programs and warranty claims, and certain
      other pre-petition claims.

      Pursuant to the Bankruptcy Code, schedules were filed by the Debtors with
      the Bankruptcy Court on October 23, 2001, and certain of the schedules
      were amended on May 31, 2002, and December 13, 2002, setting forth the

                                      -10-


      assets and liabilities of the Debtors as of the date of the Filing. The
      Bankruptcy Court established a bar date of January 15, 2003, by which
      proofs of claim were required to be filed against the Debtors for all
      claims other than asbestos-related personal injury claims as defined in
      the Bankruptcy Court's order.

      Approximately 5,000 proofs of claim for general unsecured creditors
      (including pre-petition debtholders and contingent claims, but excluding
      asbestos-related claims), totaling approximately $8.7 billion were filed
      by the bar date. Of this amount, $5.7 billion worth of claims have been
      withdrawn from the case by creditors. The Debtors have been analyzing the
      remaining proofs of claim and determined that many of them are duplicates
      of other proofs of claim or of liabilities previously scheduled by the
      Debtors. In addition, many claims were filed against multiple Debtors or
      against an incorrect Debtor, or were incorrectly claiming a priority level
      higher than general unsecured or an incorrect dollar amount. To date, the
      court has expunged 264 claims totaling $29.5 million as duplicates;
      expunged 416 claims totaling $198.4 million as amended or superceded;
      allowed the reduction of 565 claims by a total of $5.5 million; and
      allowed the correction of the Debtors on 1,209 claims and the
      reclassification of 258 claims to general unsecured claims. The Debtors
      continue to analyze and reconcile filed claims on an ongoing basis.

      The deadline to bring avoidance actions in the Chapter 11 Cases was June
      25, 2003. Avoidance actions could include claims to avoid alleged
      preferences made during the 90-day period prior to the filing (or one-year
      period for insiders) and other transfers made or obligations incurred
      which could be alleged to be constructive or actual fraudulent conveyances
      under applicable law. Effective prior to the avoidance action deadline,
      the Bankruptcy Court granted the motion of the committee representing the
      unsecured creditors to file a complaint seeking to avoid and recover as
      preferences certain pre-petition payments made by the Debtors to 206
      creditors, where such payments, in most cases, exceeded $500,000. The
      Bankruptcy Court also granted the committee's request to extend the time
      by which the summons and complaint are served upon each named defendant
      until 90 days after confirmation of a plan of reorganization filed in
      connection with the Chapter 11 Cases.

      In addition, prior to the deadline for filing avoidance actions, certain
      of the Debtors entered into a Tolling Agreement pursuant to which the
      Debtors voluntarily agreed to extend the time during which actions could
      be brought to avoid certain intercompany transactions that occurred during
      the one-year period prior to the filing of the Chapter 11 Cases. The
      transactions as to which the Tolling Agreement applies are the creation of
      liens on certain assets of Debtor subsidiaries in favor of the Corporation
      in connection with intercompany loan agreements; a transfer by U.S. Gypsum
      to the Corporation of a 9% interest in the equity of CGC Inc., the
      principal Canadian subsidiary of the Corporation; and transfers made by
      the Corporation to USG Foreign Investments, Ltd., a non-Debtor subsidiary.
      The Bankruptcy Court approved the Tolling Agreement in June 2003.

                                      -11-


      The Debtors expect to address claims for general unsecured creditors
      through liquidation, estimation or disallowance of the claims. In
      connection with this process, the Debtors will make adjustments to their
      schedules and financial statements as appropriate. Any such adjustments
      could be material to the Corporation's consolidated financial position,
      cash flows and results of operations in any given period. At this time, it
      is not possible to estimate the Debtors' liability for these claims.
      However, it is likely that the Debtors' liability for these claims will be
      different from the amounts now recorded by the Debtors. Proofs of claim
      alleging asbestos property damage claims are discussed in Note 13.
      Litigation under Developments in the Reorganization Proceeding.

      FINANCIAL STATEMENT PRESENTATION

      The accompanying consolidated financial statements have been prepared in
      accordance with American Institute of Certified Public Accountants
      ("AICPA") Statement of Position 90-7 ("SOP 90-7"), "Financial Reporting by
      Entities in Reorganization Under the Bankruptcy Code," and on a
      going-concern basis, which contemplates continuity of operations,
      realization of assets and liquidation of liabilities in the ordinary
      course of business. However, as a result of the Filing, such realization
      of assets and liquidation of liabilities, without substantial adjustments
      and/or changes of ownership, are subject to uncertainty. Given this
      uncertainty, there is substantial doubt about the Corporation's ability to
      continue as a going concern. Such doubt includes, but is not limited to, a
      possible change in control of the Corporation, as well as a potential
      change in the composition of the Corporation's business portfolio. The
      financial statements do not include any adjustments that might result from
      the outcome of this uncertainty. While operating as debtors-in-possession
      under the protection of chapter 11 of the Bankruptcy Code and subject to
      Bankruptcy Court approval or otherwise as permitted in the ordinary course
      of business, the Debtors, or any of them, may sell or otherwise dispose of
      assets and liquidate or settle liabilities for amounts other than those
      reflected in the consolidated financial statements. Further, a plan of
      reorganization could materially change the amounts and classifications in
      the historical consolidated financial statements.

      The Corporation's ability to continue as a going concern is dependent
      upon, among other things, (i) the ability of the Corporation to maintain
      adequate cash on hand, (ii) the ability of the Corporation to generate
      cash from operations, (iii) confirmation of a plan of reorganization under
      the Bankruptcy Code and (iv) the Corporation's ability to be profitable
      following such confirmation. The Corporation believes that cash and
      marketable securities on hand and future cash available from operations
      will provide sufficient liquidity to allow its businesses to operate in
      the normal course without interruption for the duration of the chapter 11
      proceedings. This includes its ability to meet post-petition obligations
      of the Debtors and to meet obligations of the non-Debtor subsidiaries.

                                      -12-


      LIABILITIES SUBJECT TO COMPROMISE

      As reflected in the consolidated financial statements, liabilities subject
      to compromise refers to the Debtors' liabilities incurred prior to the
      commencement of the Chapter 11 Cases. The amounts of the various
      liabilities that are subject to compromise are set forth in the table
      below. These amounts represent the Debtors' estimate of known or potential
      pre-petition claims to be resolved in connection with the Chapter 11
      Cases. Such claims remain subject to future adjustments. Adjustments may
      result from (i) negotiations, (ii) actions of the Bankruptcy Court, (iii)
      further developments with respect to disputed claims, (iv) rejection of
      executory contracts and unexpired leases, (v) the determination as to the
      value of any collateral securing claims, (vi) proofs of claim, including
      unaccrued and unrecorded post-petition interest expense, (vii) effect of
      any legislation which may be enacted or (viii) other events.

      The amount shown below for the asbestos reserve reflects the Corporation's
      pre-petition estimate of liability associated with asbestos claims to be
      filed in the tort system through 2003, and this liability, in addition to
      liability for post-2003 claims, is the subject of significant dispute in
      the Chapter 11 Cases. See Note 13. Litigation for additional information
      on the background of asbestos litigation, developments in the
      Corporation's reorganization proceeding and estimated cost.

      As of the date of this report, virtually all of the Corporation's
      pre-petition debt is in default due to the Filing and included in
      liabilities subject to compromise. This includes debt outstanding of $469
      million under the pre-petition bank credit facilities and $536 million of
      other outstanding debt.

      Payment terms for liabilities subject to compromise will be established as
      part of a plan of reorganization under the Chapter 11 Cases. Liabilities
      subject to compromise in the consolidated and debtor-in-possession balance
      sheets as of June 30 consisted of the following items (dollars in
      millions):



                                                 As of          As of
                                                June 30,     December 31,
                                                  2004          2003
                                                --------     ------------
                                                      
Accounts payable                                $    162     $        162
Accrued expenses                                      42               44
Debt                                               1,005            1,005
Asbestos reserve                                   1,061            1,061
Other long-term liabilities                           13               14
                                                --------     ------------
Subtotal                                           2,283            2,286
Elimination of intercompany accounts payable         (43)             (43)
                                                --------     ------------
Total liabilities subject to compromise            2,240            2,243
                                                ========     ============


                                      -13-


      INTERCOMPANY TRANSACTIONS

      In the normal course of business, the Corporation (also referred to as the
      "Parent Company" in the following discussion of intercompany transactions)
      and the operating subsidiaries engage in intercompany transactions. To
      document the relations created by these transactions, the Parent Company
      and the operating subsidiaries, from the formation of the Corporation in
      1985, have been parties to intercompany loan agreements that evidence
      their obligations as borrowers or rights as lenders arising out of
      intercompany cash transfers and various allocated intercompany charges
      (the "Intercompany Corporate Transactions").

      The Corporation operates a consolidated cash management system under which
      the cash receipts of the domestic operating subsidiaries are ultimately
      concentrated in Parent Company accounts. Cash disbursements for those
      operating subsidiaries originate from those Parent Company concentration
      accounts. Allocated intercompany charges from the Parent Company to the
      operating subsidiaries primarily include expenses related to rent,
      property taxes, information technology, and research and development,
      while allocated intercompany charges between certain operating
      subsidiaries primarily include expenses for shared marketing, sales,
      customer service, engineering and accounting services. Detailed accounting
      records are maintained of all cash flows and intercompany charges through
      the system in either direction. Net balances, receivables or payables of
      such cash transactions are reviewed on a regular basis with interest
      earned or accrued on the balances. During the first six months of 2001,
      the Corporation took steps to secure the obligations from each of the
      principal domestic operating subsidiaries under the intercompany loan
      agreements when it became clear that the asbestos liability claims of U.S.
      Gypsum were becoming an increasingly greater burden on the Corporation's
      cash resources.

      As of June 30, 2004, U.S. Gypsum and USG Interiors had net pre-petition
      payable balances to the Parent Company for Intercompany Corporate
      Transactions of $295 million and $109 million, respectively. L&W Supply
      had a net pre-petition receivable balance from the Parent Company of $33
      million. These pre-petition balances are subject to the provisions of the
      Tolling Agreement discussed above. See Pre-Petition Liabilities Other Than
      Asbestos Personal Injury Claims, above.

      As of June 30, 2004, U.S. Gypsum and L&W Supply had net post-petition
      receivable balances from the Parent Company for Intercompany Corporate
      Transactions of $273 million and $160 million, respectively. USG Interiors
      had a net post-petition payable balance to the Parent Company of $16
      million.

      In addition to the above transactions, the operating subsidiaries engage
      in ordinary course purchase and sale of products with other operating
      subsidiaries (the "Intercompany Trade Transactions"). Detailed accounting
      records also are maintained of all such transactions, and settlements are
      made on a monthly basis. Certain Intercompany Trade Transactions between

                                      -14-


      U.S. and non-U.S. operating subsidiaries are settled via wire transfer
      payments utilizing several payment systems.

      CHAPTER 11 REORGANIZATION EXPENSES

      Chapter 11 reorganization expenses in the consolidated and
      debtor-in-possession statements of earnings consisted of the following
      (dollars in millions):



                                              Three Months         Six Months
                                             ended June 30,      ended June 30,
                                             --------------      --------------
                                             2004      2003      2004      2003
                                             ----      ----      ----      ----
                                                               
Legal and financial advisory fees            $  6      $  5      $ 10      $  9
Bankruptcy-related interest income             (2)       (2)       (4)       (4)
                                             ----      ----      ----      ----
Total chapter 11 reorganization expenses        4         3         6         5
                                             ====      ====      ====      ====


      INTEREST EXPENSE

      For the second quarter and first six months of 2004, contractual interest
      expense not accrued or recorded on pre-petition debt totaled $18 and $35
      million, respectively. From the Petition Date through June 30, 2004,
      contractual interest expense not accrued or recorded on pre-petition debt
      totaled $221 million. Although no post-petition accruals are required to
      be made for such contractual interest expense, debtholders may seek to
      recover such amounts in the Chapter 11 Cases.

      DIP FINANCIAL STATEMENTS

      Under the Bankruptcy Code, the Corporation is required to file
      periodically with the Bankruptcy Court various documents including
      financial statements of the Debtors (the Debtor-In-Possession or "DIP"
      financial statements). The Corporation cautions that these financial
      statements are prepared according to requirements under the Bankruptcy
      Code. While these financial statements accurately provide information
      required under the Bankruptcy Code, they are nonetheless unconsolidated,
      unaudited and prepared in a format different from that used in the
      Corporation's consolidated financial statements filed under the securities
      laws. Accordingly, the Corporation believes the substance and format do
      not allow meaningful comparison with the Corporation's regular publicly
      disclosed consolidated financial statements. The Debtors consist of the
      Corporation and the following wholly owned subsidiaries: United States
      Gypsum Company; USG Interiors, Inc.; USG Interiors International, Inc.;
      L&W Supply Corporation; Beadex Manufacturing, LLC; B-R Pipeline Company;
      La Mirada Products Co., Inc.; Stocking Specialists, Inc.; USG Industries,
      Inc.; and USG Pipeline Company.

      The condensed DIP financial statements of the Debtors are presented as
      follows:

                                      -15-


                   USG CORPORATION AND OTHER DEBTOR COMPANIES
                   DEBTOR-IN-POSSESSION STATEMENT OF EARNINGS
                              (DOLLARS IN MILLIONS)
                                   (UNAUDITED)



                                         THREE MONTHS            SIX MONTHS
                                        ENDED JUNE 30,         ENDED JUNE 30,
                                       -----------------     -------------------
                                        2004       2003       2004        2003
                                       -------     -----     -------     -------
                                                             
Net sales                              $ 1,035     $ 827     $ 1,953     $ 1,608
Cost of products sold                      853       719       1,648       1,403
Selling and administrative expenses         67        70         132         139
Chapter 11 reorganization expenses           4         3           6           5
Interest expense                             1         2           2           3
Interest income                             (1)       (1)         (1)         (1)
Other (income) expense, net                  -        (2)          -          (4)
                                       -------     -----     -------     -------
Earnings before income taxes and
cumulative effect of accounting
change                                     111        36         166          63

Income taxes                                47        17          73          29
                                       -------     -----     -------     -------
Earnings before cumulative effect
of accounting change                        64        19          93          34
Cumulative effect of accounting
change                                       -         -           -         (13)
                                       -------     -----     -------     -------
Net earnings                                64        19          93          21
                                       =======     =====     =======     =======


                                      -16-


                   USG CORPORATION AND OTHER DEBTOR COMPANIES
                       DEBTOR-IN-POSSESSION BALANCE SHEETS
                              (DOLLARS IN MILLIONS)
                                   (UNAUDITED)



                                                      AS OF          AS OF
                                                     JUNE 30,     DECEMBER 31,
                                                       2004           2003
                                                     --------     ------------
                                                            
ASSETS
Current Assets:
Cash and cash equivalents                            $    444     $        489
Short-term marketable securities                           65               64
Restricted cash                                            26                7
Receivables (net of reserves - $11 and $11)               422              276
Inventories                                               309              232
Income taxes receivable                                    20               21
Deferred income taxes                                      44               41
Other current assets                                       46               47
                                                     --------     ------------
Total current assets                                    1,376            1,177
Long-term marketable securities                           211              176
Property, plant and equipment (net of accumulated
  depreciation and depletion - $687 and $645)           1,572            1,576
Deferred income taxes                                     148              178
Goodwill                                                   41               39
Other assets                                              356              358
                                                     --------     ------------
Total Assets                                            3,704            3,504
                                                     ========     ============
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable                                          241              168
Accrued expenses                                          184              186
Income taxes payable                                       26                4
                                                     --------     ------------
Total current liabilities                                 451              358
Other liabilities                                         415              403
Liabilities subject to compromise                       2,240            2,243
Stockholders' Equity:
Preferred stock                                             -                -
Common stock                                                5                5
Treasury stock                                           (258)            (258)
Capital received in excess of par value                   101              101
Accumulated other comprehensive income                     13                8
Retained earnings                                         737              644
                                                     --------     ------------
Total stockholders' equity                                598              500
                                                     --------     ------------
Total Liabilities and Stockholders' Equity              3,704            3,504
                                                     ========     ============


                                      -17-


                   USG CORPORATION AND OTHER DEBTOR COMPANIES
                  DEBTOR-IN-POSSESSION STATEMENTS OF CASH FLOWS
                              (DOLLARS IN MILLIONS)
                                   (UNAUDITED)



                                                              SIX MONTHS
                                                            ENDED JUNE 30,
                                                            ---------------
                                                            2004      2003
                                                            -----     ----
                                                                
OPERATING ACTIVITIES:
Net earnings                                                $  93     $  21
Adjustments to reconcile net earnings to net cash:
    Cumulative effect of accounting change                      -        13
    Depreciation, depletion and amortization                   46        44
    Deferred income taxes                                      24        16
    (Gain) loss on asset dispositions                          (1)        -
(Increase) decrease in working capital:
     Receivables                                             (146)      (70)
     Income taxes receivable                                    1         3
     Inventories                                              (77)      (10)
     Payables                                                  95        31
     Accrued expenses                                          (2)      (43)
(Increase) decrease in intercompany receivable                 18       (10)
(Increase) decrease in other assets                            (9)       (3)
Increase (decrease) increase in other liabilities              12         2
Change in asbestos receivable                                  11        19
Decrease in liabilities subject to compromise                  (3)      (17)
Other, net                                                     (8)       (6)
                                                            -----     -----
Net cash provided by (used for) operating activities           54       (10)
                                                            -----     -----
INVESTING ACTIVITIES:
Capital expenditures                                          (41)      (24)
Purchases of marketable securities                           (171)     (148)
Sale or maturities of marketable securities                   135        91
Net proceeds from asset dispositions                            1         -
Acquisition of business                                        (4)       (2)
                                                            -----     -----
Net cash used for investing activities                        (80)      (83)
                                                            -----     -----
FINANCING ACTIVITIES:
Deposit of restricted cash                                    (19)      (21)
                                                            -----     -----
Net cash used for financing activities                        (19)      (21)
                                                            -----     -----
Net decrease in cash and cash equivalents                     (45)     (114)

Cash and cash equivalents at beginning of period              489       478
                                                            -----     -----
Cash and cash equivalents at end of period                    444       364
                                                            =====     =====
SUPPLEMENTAL CASH FLOW DISCLOSURES:
Interest paid                                                   1         1
Income taxes paid, net                                         25         1


                                      -18-


(3)   EXIT ACTIVITIES

      In the fourth quarter of 2003, the Corporation recorded a charge of $3
      million pretax ($2 million after-tax) for severance related to a salaried
      workforce reduction of approximately 70 employees. An additional 56 open
      positions were eliminated. Payments totaling $1 million were made in the
      fourth quarter of 2003, and a reserve of $2 million was included in
      accrued expenses on the consolidated balance sheet as of December 31,
      2003. The remaining payments of $2 million were made in the first quarter
      of 2004.

(4)   EARNINGS PER SHARE

      Basic earnings per share are based on the weighted average number of
      common shares outstanding. Diluted earnings per share are based on the
      weighted average number of common shares outstanding and the dilutive
      effect of the potential exercise of outstanding stock options. Diluted
      earnings per share exclude the potential exercise of outstanding stock
      options for any period in which such exercise would have an anti-dilutive
      effect. The reconciliation of basic earnings per share to diluted earnings
      per share is shown in the following table (dollars in millions, except
      share data):



                                                          Weighted
                                                           Average
                                      Net       Shares    Per-Share
                                    Earnings    (000)      Amount
                                    --------    ------    ---------
                                                 
Three Months Ended June 30,
2004:
Basic earnings                        $ 80      43,017    $   1.86
Dilutive effect of stock options                     1
                                      ----      ------    ---------
Diluted earnings                        80      43,018        1.86
                                      ====      ======    =========
2003:
Basic earnings                          31      43,046        0.73
Dilutive effect of stock options                     -
                                      ----      ------    ---------
Diluted earnings                        31      43,046        0.73
                                      ====      ======    =========

Six Months Ended June 30,
2004:
Basic earnings                        $137      43,020    $   3.18
Dilutive effect of stock options                     1
                                      ----      ------    ---------
Diluted earnings                       137      43,021        3.18
                                      ====      ======    =========
2003:
Basic earnings                          37      43,097        0.86
Dilutive effect of stock options                     -
                                      ----      ------    ---------
Diluted earnings                        37      43,097        0.86
                                      ====      ======    =========


                                      -19-


(5)   MARKETABLE SECURITIES

      As of June 30, 2004 and 2003, the Corporation's investments in marketable
      securities consisted of the following (dollars in millions):



                                               2004                2003
                                       -------------------  ------------------
                                                    Fair                Fair
                                       Amortized   Market   Amortized  Market
                                         Cost      Value      Cost      Value
                                       ---------  --------  ---------  -------
                                                           
Asset-backed securities                 $   113   $   112    $   108   $   108
U.S. government and agency securities        69        69         64        65
Municipal securities                         40        40         28        28
Corporate securities                         51        51         10        10
Time deposits                                 4         4         27        27
                                        -------   -------    -------   -------
Total marketable securities                 277       276        237       238
                                        =======   =======    =======   =======


      Contractual maturities of marketable securities as of June 30, 2004, were
      as follows (dollars in millions):



                                             Fair
                               Amortized    Market
                                 Cost       Value
                               ---------    ------
                                      
Due in 1 year or less          $      69    $   69
Due in 1-5 years                      44        44
Due in 5-10 years                      5         5
Due after 10 years                    46        46
                               ---------    ------
                                     164       164
Asset-backed securities              113       112
                               ---------    ------
Total marketable securities          277       276
                               =========    ======


      The average duration of the portfolio is less than one year because a
      majority of the longer-term securities have paydown or put features and
      liquidity facilities.

      The Corporation had investments in marketable securities with a fair
      market value of $173 million that were in an unrealized loss position for
      less than 12 months as of June 30, 2004. These investments were in the
      following types of securities: $81 million in asset-backed securities, $58
      million in government and agency securities, $30 million in corporate
      securities and $4 million in time deposits. The unrealized losses for
      these investments amounted to $1 million. The Corporation also had $3
      million in asset backed securities, $3 million in government and agency
      securities, and $4 million in corporate securities that had been in a
      continuous loss position for a period greater than 12 months as of June
      30, 2004. The amount of unrealized loss positions for these investments
      was less than $100,000.

                                      -20-


(6)   ASSET RETIREMENT OBLIGATIONS

      On January 1, 2003, the Corporation adopted SFAS No. 143, "Accounting for
      Asset Retirement Obligations." This standard requires the recording of the
      fair value of a liability for an asset retirement obligation in the period
      in which it is incurred. The Corporation's asset retirement obligations
      include reclamation requirements as regulated by government authorities
      related principally to assets such as the Corporation's mines, quarries,
      landfills, ponds and wells. The impact to the Corporation of adopting SFAS
      No. 143 was an increase in assets of $14 million, which included a $12
      million increase in deferred tax assets, and an increase in liabilities of
      $30 million, which included a $1 million increase in deferred tax
      liabilities. A noncash, after-tax charge of $16 million ($27 million
      pretax) was reflected on the consolidated statement of earnings as a
      cumulative effect of a change in accounting principle as of January 1,
      2003. The liability for asset retirement obligations was $35 million as of
      June 30, 2004, and December 31, 2003.

(7)   GOODWILL AND OTHER INTANGIBLE ASSETS

      Total goodwill amounted to $41 million as of June 30, 2004, and $39
      million as of December 31, 2003. Goodwill increased by $2 million during
      the first six months of 2004 as a result of a business acquisition during
      the period.

      Other intangible assets amounted to $2 million as of June 30, 2004, and
      December 31, 2003. As of June 30, 2004, $1 million of this amount was
      subject to amortization over a five-year life. Other intangible assets are
      included in other assets on the consolidated balance sheet.

                                      -21-


(8)   DERIVATIVE INSTRUMENTS

      The Corporation uses derivative instruments to manage selected commodity
      price and foreign currency exposures. The Corporation does not use
      derivative instruments for trading purposes. All derivative instruments
      are recorded on the balance sheet at fair value. For derivatives
      designated as fair value hedges, the changes in the fair values of both
      the derivative instrument and the hedged item are recognized in earnings
      in the current period. For derivatives designated as cash flow hedges, the
      effective portion of changes in the fair value of the derivative is
      recorded to accumulated other comprehensive income (loss) on the balance
      sheet and is reclassified to earnings when the underlying transaction has
      an impact on earnings. The ineffective portion of changes in the fair
      value of the derivative is reported in cost of products sold. The amount
      of ineffectiveness recorded in the second quarter and first six months of
      2004 amounted to pretax income of $1 million and $2 million respectively.

      COMMODITY DERIVATIVE INSTRUMENTS

      The Corporation uses swap contracts to hedge anticipated purchases of
      natural gas to be used in its manufacturing operations. The current
      contracts, all of which mature by December 31, 2005, are generally
      designated as cash flow hedges, with changes in fair value recorded to
      accumulated other comprehensive income (loss) until the hedged transaction
      occurs, at which time it is reclassified to earnings. As of June 30, 2004,
      the fair value of these swap contracts was $25 million ($15 million
      after-tax), of which $23 million ($14 million after-tax) remained in
      accumulated other comprehensive income (loss).

      FOREIGN EXCHANGE DERIVATIVE INSTRUMENTS

      The Corporation has operations in a number of countries and uses forward
      contracts from time to time to hedge selected risk of changes in cash
      flows resulting from forecasted intercompany and third-party sales or
      purchases denominated in non-U.S. currencies. These contracts are
      generally designated as cash flow hedges, for which changes in fair value
      are recorded to accumulated other comprehensive income (loss) until the
      underlying transaction has an impact on earnings. As of June 30, 2004, the
      Corporation had no such foreign currency contracts.

      COUNTERPARTY RISK

      The Corporation is exposed to credit losses in the event of nonperformance
      by the counterparties on its financial instruments. All counterparties
      have investment grade credit standing; accordingly, the Corporation
      anticipates that these counterparties will be able to satisfy fully their
      obligations under the contracts. The Corporation does not generally obtain
      collateral or other security to support financial instruments subject to
      credit risk but monitors the credit standing of all counterparties.

                                      -22-


(9)   COMPREHENSIVE INCOME

      The components of comprehensive income are summarized in the following
      table (dollars in millions):



                                           Three Months        Six Months
                                          ended June 30,     ended June 30,
                                          --------------     --------------
                                          2004      2003     2004      2003
                                          -----     ----     -----     ----
                                                           
Net earnings                              $  80     $ 31     $ 137     $ 37
                                          -----     ----     -----     ----

Pretax gain (loss) on derivatives            (1)      (2)       12       (2)
Income tax benefit (expense)                  -        1        (5)       1
                                          -----     ----     -----     ----
Gain (loss) on derivatives, net of tax       (1)      (1)        7       (1)
                                          -----     ----     -----     ----
Deferred currency translation                (7)      13        (9)      24
                                          -----     ----     -----     ----
Unrealized gain (loss) on marketable
  securities, net of tax                     (1)       -        (1)       -
                                          -----     ----     -----     ----
Total comprehensive income                   71       43       134       60
                                          =====     ====     =====     ====


      There was no tax impact on the foreign currency translation adjustments.

      The components of accumulated other comprehensive income (loss) included
      on the consolidated balance sheets are summarized in the following table
      (dollars in millions):



                                                                As of          As of
                                                               June 30,     December 31,
                                                                 2004           2003
                                                               --------     ------------
                                                                      
Gain on derivatives, net of tax                                $     17     $         10
Deferred currency translation                                       (17)              (8)
Minimum pension liability, net of tax                                (3)              (3)
Unrealized gain (loss) on marketable securities, net of tax          (1)               -
                                                               --------     ------------
Total accumulated other comprehensive income (loss)                  (4)              (1)
                                                               ========     ============


      During the second quarter of 2004, accumulated net after-tax gains of $5
      million ($9 million pretax) on derivatives were reclassified from
      accumulated other comprehensive income (loss) to earnings. As of June 30,
      2004, the estimated net after-tax gain expected to be reclassified within
      the next 12 months from accumulated other comprehensive income (loss) into
      earnings is $15 million.

                                      -23-


(10)  EMPLOYEE RETIREMENT PLANS

      The components of net pension and postretirement benefits costs for the
      three months and six months ended June 30, 2004 and 2003 are summarized in
      the following table (dollars in millions):



                                    Three Months        Six Months
                                   ended June 30,     ended June 30,
                                   --------------     --------------
                                   2004      2003     2004      2003
                                   -----     ----     -----     ----
                                                   
PENSION:
Service cost of benefits earned    $   9     $  9     $  16     $ 14
Interest cost on projected
       benefit obligation             14       13        27       26
Expected return on plan assets       (14)     (13)      (27)     (26)
Net amortization                       4        3         9        6
                                   -----     ----     -----     ----
Net cost                              13       12        25       20
                                   =====     ====     =====     ====

POSTRETIREMENT:
Service cost of benefits earned        3        3         7        6
Interest cost on projected
       benefit obligation              6        6        11       11
Recognized loss                        2        -         2        -
                                   -----     ----     -----     ----
Net cost                              11        9        20       17
                                   =====     ====     =====     ====


      In accordance with the Corporation's funding policy, the Corporation and
      its subsidiaries contributed cash of $30 million and $38 million during
      the second quarter and first six months of 2004, respectively, and expect
      to contribute cash of approximately $74 million during the full year 2004
      to their pension plans.

      On May 19, 2004, the Financial Accounting Standards Board ("FASB") issued
      FASB Staff Position ("FSP") FAS 106-2, "Accounting and Disclosure
      Requirements Related to the Medicare Prescription Drug, Improvement and
      Modernization Act of 2003." FSP 106-2 provides guidance on accounting for
      the effects of prescription drug provisions of the Medicare Act (the
      "Act") for employers that sponsor postretirement health care plans that
      provide prescription drug benefits and requires those employers to provide
      certain disclosures regarding the effect of the federal subsidy provided
      by the Act. This FSP supercedes FSP 106-1 of the same subject that allowed
      employers to either defer or recognize the legislation's effect. The new
      disclosure requirements will be effective for the first financial
      reporting period that begins after June 15, 2004. The Corporation adopted
      FSP 106-2 effective July 1, 2004 and estimates that the adoption of this
      FSP will result in an approximate $40 million reduction in its accumulated
      postretirement benefit obligation and a related $3 million reduction in
      net periodic postretirement benefit cost during the last six months of
      2004 versus the cost previously anticipated.

                                      -24-


      In addition, the required remeasurement of the plan's liability assumed a
      change in the health-care-cost trend rate which resulted in increases in
      the accumulated postretirement benefit obligation and net periodic
      postretirement benefit cost. These increases largely offset the reduction
      in the liability and costs related to the adoption of FSP 106-2 as
      described above.

(11)  STOCK-BASED COMPENSATION

      The Corporation accounts for stock-based compensation using the intrinsic
      value method, which measures compensation cost as the quoted market price
      of the stock at the date of grant less the grant price, if any, that the
      employee is required to pay. If the Corporation had elected to recognize
      compensation cost for stock-based compensation grants using the fair value
      method, net earnings and net earnings per common share would not have
      changed as shown below (dollars in millions, except per-share data):



                                          Three Months      Six Months
                                         ended June 30,    ended June 30,
                                         --------------    --------------
                                         2004     2003     2004     2003
                                         -----    -----    -----    -----
                                                        
NET EARNINGS:
Net Earnings: As reported                $  80    $  31    $ 137    $  37
Deduct: Fair value method of stock
        -based employee compensation
        expense, net of tax                  -        -        -        -
                                         -----    -----    -----    -----
Pro forma net earnings                      80       31      137       37
                                         =====    =====    =====    =====
BASIC AND DILUTED EARNINGS PER SHARE:
As reported                               1.86     0.73     3.18     0.86
Pro forma                                 1.86     0.73     3.18     0.86
                                         =====    =====    =====    =====


      Subsequent to the Filing, no stock option grants have been issued.

      As of June 30, 2004, common shares totaling 2,346,500 were reserved for
      future issuance in conjunction with existing stock option grants. In
      addition, 2,549,720 common shares were reserved for future grants. Shares
      issued in option exercises may be from original issue or available
      treasury shares.

                                      -25-


(12)  OPERATING SEGMENTS

      The Corporation's operations are organized into three operating segments:
      (i) North American Gypsum, which manufactures SHEETROCK(R) brand gypsum
      wallboard and joint compound, DUROCK(R) brand cement board, FIBEROCK(R)
      brand gypsum fiber panels and other related building products in the
      United States, Canada and Mexico; (ii) Worldwide Ceilings, which
      manufactures ceiling tile in the United States and ceiling grid in the
      United States, Canada, Europe and the Asia-Pacific region; and (iii)
      Building Products Distribution, which distributes gypsum wallboard,
      drywall metal, ceiling products, joint compound and other building
      products throughout the United States. Operating segment results were as
      follows (dollars in millions):



                                        Three Months            Six Months
                                       ended June 30,         ended June 30,
                                      -----------------     -------------------
                                       2004       2003       2004        2003
                                      -------     -----     -------     -------
                                                            
NET SALES:
North American Gypsum                 $   678     $ 566     $ 1,317     $ 1,108
Worldwide Ceilings                        190       154         356         301
Building Products Distribution            454       325         816         620
Eliminations                             (177)     (131)       (324)       (253)
                                      -------     -----     -------     -------
Total USG Corporation                   1,145       914       2,165       1,776
                                      =======     =====     =======     =======
OPERATING PROFIT:
North American Gypsum                     102        47         183          85
Worldwide Ceilings                         26         9          41          17
Building Products Distribution             31        16          45          24
Corporate                                 (20)      (18)        (36)        (36)
Chapter 11 reorganization expenses         (4)       (3)         (6)         (5)
Eliminations                               (2)       (1)         (2)          -
                                      -------     -----     -------     -------
Total USG Corporation                     133        50         225          85
                                      =======     =====     =======     =======


(13)  LITIGATION

      ASBESTOS AND RELATED BANKRUPTCY LITIGATION

      One of the Corporation's subsidiaries, U.S. Gypsum, is among many
      defendants in more than 100,000 asbestos lawsuits alleging personal injury
      or property damage liability. Most of the asbestos lawsuits against U.S.
      Gypsum seek compensatory and, in many cases, punitive damages for personal
      injury allegedly resulting from exposure to asbestos-containing products
      (the "Personal Injury Cases"). Certain of the asbestos lawsuits seek to
      recover compensatory and, in many cases, punitive damages for costs
      associated with the maintenance or removal and replacement of
      asbestos-containing products in buildings (the "Property Damage Cases"). A
      more detailed description of the Property Damage and Personal Injury Cases
      against U.S. Gypsum and asbestos personal injury cases against certain
      other Debtors is set forth below.

      U.S. Gypsum's asbestos liability derives from its sale of certain
      asbestos-

                                      -26-


      containing products beginning in the late 1920s. In most cases, the
      products were discontinued or asbestos was removed from the formula by
      1972, and no asbestos-containing products were produced after 1978.

      The amount of U.S. Gypsum's present and future asbestos liabilities is the
      subject of significant dispute in Debtors' Chapter 11 Cases. If the amount
      of the Debtors' asbestos liabilities is not resolved through negotiation
      in the Chapter 11 Cases or addressed by federal legislation, the amount of
      those liabilities may be determined through litigation proceedings in the
      Chapter 11 Cases, the outcome of which is extremely speculative.

      Recent developments in the Corporation's bankruptcy proceeding and a more
      detailed discussion of the Debtors' asbestos liabilities are addressed
      below. See also Note 2. Voluntary Reorganization Under Chapter 11, above,
      for additional information on the voluntary reorganization proceeding and
      potential federal legislation.

      DEVELOPMENTS IN THE REORGANIZATION PROCEEDING: In late 2001, the Debtors'
      Chapter 11 Cases, along with four other asbestos-related bankruptcies,
      were assigned to Judge Alfred M. Wolin of the United States District Court
      for the District of New Jersey.

      In 2002, the Debtors filed a motion requesting Judge Wolin to conduct
      hearings to substantively estimate the Debtors' liability for asbestos
      personal injury claims. The Debtors requested that the Court hear evidence
      and make rulings regarding the characteristics of valid asbestos personal
      injury claims against the Debtors and then estimate the Debtors' liability
      for present and future asbestos personal injury claims based upon these
      rulings. One of the key liability issues is whether claimants who do not
      have objective evidence of asbestos-related disease have valid claims and
      are entitled to be compensated by the Debtors or whether such claimants
      are entitled to compensation only if and when they develop
      asbestos-related disease.

      The Official Committee of Asbestos Personal Injury Claimants opposed the
      substantive estimation hearings proposed by the Debtors. The committee
      contends that U.S. Gypsum's liability for present and future asbestos
      personal injury claims should be based on extrapolation from U.S. Gypsum's
      settlement history of such claims and not on litigating liability issues
      in the bankruptcy proceeding. The committee contends that the Bankruptcy
      Court does not have the power to exclude claimants who do not have
      objective evidence of asbestos-related disease if such claimants are
      compensated in the tort system outside of bankruptcy.

      The Debtors also filed a motion with Judge Wolin requesting a ruling that
      putative claimants who cannot satisfy objective standards of
      asbestos-related disease are not entitled to vote on a Section 524(g)
      plan. The Debtors' motion on this voting issue has been stayed by order of
      Judge Wolin. It is

                                      -27-


      expected that the Official Committee of Asbestos Personal Injury Claimants
      will oppose the Debtors' motion.

      In response to the Debtors' motion seeking substantive estimation of the
      Debtors' asbestos personal injury liability, Judge Wolin issued a
      Memorandum Opinion and Order (the "Order") on February 19, 2003, setting
      forth a procedure for estimating the Debtors' liability for present and
      future asbestos personal injury claims alleging cancer. The Order provides
      that the Court will set a bar date for the filing of asbestos personal
      injury claims alleging cancer and that the Court will hold an estimation
      hearing regarding these claims under 11 U.S.C. Section 502(c), at which
      the "debtors will be permitted to present their defenses."

      The Order contemplates that after the estimation of the Debtors' liability
      for present and future cancer claims, the Court will determine whether the
      Debtors' liability for these cancer claims alone exceeds the Debtors'
      assets. According to the Order, the determination of whether the Debtors
      have sufficient assets to pay legitimate cancer claimants will guide the
      Court in determining whether the Debtors' resources should be spent
      resolving the issue of the validity of non-malignant claims where there is
      no objective evidence of asbestos-related disease.

      No timetable has been set for implementation of the Order or any hearing
      on estimation of the Debtors' liability for cancer claims.

      In November 2003, the Debtors and the committee representing unsecured
      creditors in the Chapter 11 Cases filed a motion to recuse, or remove,
      Judge Wolin from presiding over these cases. The motion stated that Judge
      Wolin should remove himself from presiding over these cases because he has
      appointed and relied upon advisors to assist him in resolution of these
      cases who have conflicts of interest and he has had multiple private
      communications between or among certain parties to these cases, the
      advisors, and other unidentified persons, without all parties being
      present and having knowledge of these communications.

      On May 17, 2004, the Third Circuit Court of Appeals issued an opinion and
      order directing Judge Wolin to remove himself from presiding over Debtors'
      Chapter 11 Cases. The court of appeals also directed that the Debtors'
      Chapter 11 Cases be reassigned to another district court judge. Effective
      June 30, 2004, Judge Wolin resigned from his position as district court
      judge. The Debtor's Chapter 11 Cases have not yet been reassigned to a new
      district court judge.

      In the second quarter of 2004, Judge Judith K. Fitzgerald, the bankruptcy
      judge presiding over the Debtors' Chapter 11 Cases, entered an order
      directing the parties to enter into non-binding mediation relating to the
      Debtors' asbestos personal injury liability and the potential terms of a
      plan of reorganization. Judge Fitzgerald appointed David Geronemus as
      mediator. It

                                      -28-


      is expected that the mediation will begin in the third quarter of 2004.

      The Debtors were recently informed by the mediator that the legal
      representative for future asbestos claimants has raised the issue of
      whether USG Corporation and its subsidiaries may be liable for asbestos
      personal injury claims arising from the sale of asbestos-containing
      products by A.P. Green Refractories Co. ("A.P. Green") before 1967. A.P.
      Green, which manufactured and sold products used in refractories, was
      acquired by merger into U.S. Gypsum Company in 1967 and thereafter
      operated as a wholly-owned subsidiary of U.S. Gypsum Company until 1985,
      at which time A.P. Green became a wholly-owned subsidiary of USG
      Corporation. In 1988, A.P. Green became a publicly-traded company when its
      shares were distributed to the shareholders of USG Corporation. In
      February 2002, A.P. Green (now known as A.P. Green Industries, Inc.), as
      well as its parent company, Global Industrial Technologies, Inc., and
      other affiliates, filed voluntary petitions for reorganization through
      which A.P. Green and its affiliates seek to resolve their asbestos-related
      liabilities. The A.P. Green reorganization proceeding is pending in the
      United States Bankruptcy Court for the Western District of Pennsylvania
      and is captioned In re: Global Industrial Technologies, Inc. (Case No.
      02-21626). The Corporation does not have sufficient information at this
      time to predict whether or how any plan of reorganization in the Debtors'
      Chapter 11 Cases might address any asbestos-related liability based on
      sales of asbestos-containing products by A.P. Green.

      The legal representative for future asbestos claimants and the Official
      Committee of Asbestos Personal Injury Claimants have also recently raised
      the issue of whether the assets and liabilities of all Debtors should be
      temporarily consolidated for purposes of the treatment of claims under a
      plan of reorganization. Under this theory, which is sometimes called
      "substantive consolidation," the liabilities of all Debtors subject to
      this consolidation, including liabilities based on sales of
      asbestos-containing products by U.S. Gypsum, would be paid from the pooled
      assets of U.S. Gypsum and all other Debtors subject to consolidation. If
      applied, substantive consolidation could materially and adversely affect
      the recovery rights of creditors of Debtors other than U.S. Gypsum and the
      holders of the Corporation's equity.

      As a result of the removal of Judge Wolin from Debtors' Chapter 11 Cases
      and the commencement of mediation, the Corporation does not know whether
      estimation proceedings regarding the Debtors' liability for cancer claims,
      as contemplated by Judge Wolin's February 19, 2003 Order, will occur. The
      Corporation also does not know whether the Court will ultimately address
      the validity and voting rights of non-malignant claims where there is no
      objective evidence of asbestos-related disease.

      With regard to asbestos property damage claims, the Bankruptcy Court
      established a bar date requiring all such claims against the Debtors to be
      filed by January 15, 2003. The Debtors continue to analyze and review the
      asbestos-related property damage claims received as of the claims bar
      date.

                                      -29-


      Approximately 1,400 asbestos property damage claims were filed,
      representing more than 2,000 buildings. In contrast, as of the Petition
      Date, 11 Property Damage Cases were pending against U.S. Gypsum.
      Approximately 500 of the asbestos property damage claims filed by the bar
      date assert a specific dollar amount of damages, and the total damages
      alleged in those claims is approximately $1.6 billion. However, this
      amount reflects numerous duplicate claims filed against multiple Debtors.
      Approximately 900 claims do not specify a damage amount. Most of the
      asbestos property damage claims filed do not provide any evidence that the
      Debtors' products were ever installed in any of the buildings at issue.
      Certain of the proof of claim forms purport to file claims on behalf of
      two classes of claimants that were the subject of pre-petition class
      actions. One of these claim forms was filed on behalf of a class of
      colleges and universities that was certified for certain purposes in a
      pre-petition lawsuit filed in federal court in South Carolina. However,
      many of the putative members of this class also filed individual claim
      forms. Four of the claim forms were filed by a claimant allegedly on
      behalf of putative members of certified and uncertified classes in
      connection with a pre-petition lawsuit pending in South Carolina state
      court.

      The Debtors believe that they have substantial defenses to many of these
      property damage claims, including the lack of evidence that the Debtors'
      products were ever installed in the buildings at issue, the failure to
      file the claims within the applicable statutes of limitation, and the lack
      of evidence that the claimants have any damages. The Debtors intend to
      address many of these claims through an objection and disallowance process
      in the Bankruptcy Court. The Debtors have begun this process by issuing
      written notices to claimants that failed to provide evidence that any of
      the Debtors' products were ever installed in the buildings at issue. To
      date, the Debtors have issued these deficiency notices with regard to more
      than 1,200 buildings and expect to issue additional notices. Because of
      the preliminary nature of the objection process, the Corporation cannot
      predict the outcome of these proceedings or the impact the proceedings may
      have on the estimated cost of resolving asbestos property damage claims.
      See Estimated Cost, below.

      The following is a summary of the Personal Injury and Property Damage
      Cases pending against U.S. Gypsum and certain other Debtors as of the
      Petition Date.

      PERSONAL INJURY CASES: As reported by the Center for Claims Resolution
      (the "Center"), U.S. Gypsum was a defendant in more than 100,000 pending
      Personal Injury Cases as of the Petition Date, as well as an additional
      approximately 52,000 Personal Injury Cases that may be the subject of
      settlement agreements. In the first half of 2001, up to the Petition Date,
      approximately 26,200 new Personal Injury Cases were filed against U.S.
      Gypsum, as reported by the Center, as compared to 27,800 new filings in
      the first half of 2000. Prior to the Filing, U.S. Gypsum managed the
      handling and settlement of Personal Injury Cases through its membership in
      the Center. From 1988 up to February 1, 2001, the Center administered and
      arranged for the defense and

                                      -30-


      settlement of Personal Injury Cases against U.S. Gypsum and other Center
      members. During that period, costs of defense and settlement of Personal
      Injury Cases were shared among the members of the Center pursuant to
      predetermined sharing formula. Effective February 1, 2001, the Center
      members, including U.S. Gypsum, ended their prior settlement-sharing
      arrangement. Up until the Petition Date, the Center continued to
      administer and arrange for the defense and settlement of the Personal
      Injury Cases, but liability payments were not shared among the Center
      members.

      In 2000 and years prior, U.S. Gypsum and other Center members negotiated a
      number of settlements with plaintiffs' law firms that included agreements
      to resolve over time the firms' pending Personal Injury Cases as well as
      certain future claims (the "Long-Term Settlements"). With regard to future
      claims, these Long-Term Settlements typically provide that the plaintiffs'
      firms will recommend to their future clients that they defer filing, or
      accept nominal payments on, personal injury claims that do not meet
      established disease criteria and, with regard to those claims meeting
      established disease criteria, that the future clients agree to settle
      those claims for specified amounts. These Long-Term Settlements typically
      resolve claims for amounts consistent with historical per-claim settlement
      costs paid to the plaintiffs' firms involved. As a result of the Filing,
      cash payments by U.S. Gypsum under these Long-Term Settlements have
      ceased, and U.S. Gypsum expects that its obligations under these
      settlements will be determined in the bankruptcy proceeding and plan of
      reorganization.

      In 2000, U.S. Gypsum closed approximately 57,000 Personal Injury Cases.
      U.S. Gypsum's cash payments in 2000 to defend and resolve Personal Injury
      Cases totaled $162 million, of which $90 million was paid or reimbursed by
      insurance. In 2000, the average settlement per case was approximately
      $2,600, exclusive of defense costs. U.S. Gypsum made cash payments of $100
      million in 1999 and $61 million in 1998 to resolve Personal Injury Cases,
      of which $85 million and $45.5 million, respectively, were paid or
      reimbursed by insurance.

      During late 2000 and in 2001, following the bankruptcy filings of other
      defendants in asbestos personal injury litigation, plaintiffs
      substantially increased their settlement demands to U.S. Gypsum. In
      response to these increased settlement demands, U.S. Gypsum attempted to
      manage its asbestos liability by contesting, rather than settling, a
      greater number of cases that it believed to be non-meritorious. As a
      result, in the first and second quarters of 2001, U.S. Gypsum agreed to
      settle fewer Personal Injury Cases, but at a significantly higher cost per
      case.

      In the first half of 2001, up to the Petition Date, U.S. Gypsum closed
      approximately 18,900 Personal Injury Cases. In the first half of 2001, up
      to the Petition Date, U.S. Gypsum's total asbestos-related cash payments,
      including defense costs, were approximately $124 million, of which
      approximately $10 million was paid or reimbursed by insurance. A portion
      of

                                      -31-


      these payments were for settlements agreed to in prior periods. As of
      March 31, 2001, U.S. Gypsum had estimated that cash expenditures for
      Personal Injury Cases in 2001 would total approximately $275 million
      before insurance recoveries of approximately $37 million.

      In addition to the Personal Injury Cases pending against U.S. Gypsum, one
      of the Corporation's subsidiaries and a Debtor in the bankruptcy
      proceeding, L&W Supply, was named as a defendant in approximately 21
      pending Personal Injury Cases as of the Petition Date. L&W Supply, a
      distributor of building products manufactured by U.S. Gypsum and other
      building products manufacturers, has not made any payments in the past to
      resolve Personal Injury Cases. Because of, among other things, the small
      number of Personal Injury Cases against L&W Supply to date and the lack of
      development of the cases against L&W Supply, the Corporation does not have
      sufficient information at this time to predict how any plan of
      reorganization will address any asbestos-related liability of L&W Supply.

      One of U.S. Gypsum's subsidiaries and a Debtor in the bankruptcy
      proceeding, Beadex Manufacturing, LLC ("Beadex"), manufactured and sold
      joint compound containing asbestos from 1963 through 1978 in the
      northwestern United States. As of the Petition Date, Beadex was a named
      defendant in approximately 40 Personal Injury Cases pending primarily in
      the states of Washington and Oregon. Beadex has approximately $11 million
      in primary or umbrella insurance coverage available to pay
      asbestos-related costs, as well as $15 million in available excess
      coverage. The Corporation expects that any asbestos-related liability of
      Beadex will be addressed in the plan of reorganization. However, because
      of, among other things, the small number of Personal Injury Cases pending
      against Beadex to date, the Corporation does not have sufficient
      information at this time to predict how any plan of reorganization will
      address any asbestos-related liability of Beadex.

      PROPERTY DAMAGE CASES: As of the Petition Date, U.S. Gypsum was a
      defendant in 11 Property Damage Cases, most of which involved multiple
      buildings. One of the cases is a conditionally certified class action
      comprising all colleges and universities in the United States, which
      certification is presently limited to the resolution of certain allegedly
      "common" liability issues (Central Wesleyan College v. W.R. Grace & Co.,
      et al., U.S.D.C. S.C.). As a result of the Filing, all Property Damage
      Cases are stayed against U.S. Gypsum. U.S. Gypsum's estimated cost of
      resolving the Property Damage Cases is discussed in Estimated Cost, below.

      INSURANCE COVERAGE: As of June 30, 2004, all prior receivables relating to
      insurance remaining to cover asbestos-related costs had been collected by
      U.S. Gypsum. This insurance receivable had been included in other current
      assets on the consolidated balance sheet.

      ESTIMATED COST: In evaluating U.S. Gypsum's estimated asbestos liability
      prior to the Filing, the Corporation considered numerous uncertainties
      that

                                      -32-


      made it difficult to estimate reliably U.S. Gypsum's asbestos liability in
      the tort system for both pending and future asbestos claims.

      In the Property Damage Cases, such uncertainties included, but were not
      limited to, the identification and volume of asbestos-containing products
      in the buildings at issue in each case, which is often disputed; the
      claimed damages; the viability of statute of limitations and other
      defenses; the amount for which such cases can be resolved, which normally
      (but not uniformly) has been substantially lower than the claimed damages;
      and the viability of claims for punitive and other forms of multiple
      damages.

      Uncertainties in the Personal Injury Cases included, but were not limited
      to, the number, disease, age, and occupational characteristics of
      claimants in the Personal Injury Cases; the jurisdiction and venue in
      which such cases were filed; the viability of claims for conspiracy or
      punitive damages; the elimination of indemnity sharing among Center
      members for future settlements and its negative impact on U.S. Gypsum's
      ability to continue to resolve claims at historical or acceptable levels;
      the adverse impact on U.S. Gypsum's settlement costs of recent
      bankruptcies of co-defendants; the possibility of additional bankruptcies
      of other defendants; the possibility of significant adverse verdicts due
      to recent changes in settlement strategies and related effects on
      liquidity; the inability or refusal of former Center members to fund their
      share of existing settlements and its effect on such settlement
      agreements; the continued ability to negotiate settlements or develop
      other mechanisms that defer or reduce claims from unimpaired claimants;
      and the possibility that federal legislation addressing asbestos
      litigation would be enacted. The Corporation reported that adverse
      developments with respect to any of these uncertainties could have a
      material impact on U.S. Gypsum's settlement costs and could materially
      increase the cost above the estimated range discussed below.

      In 2000, an independent actuarial study of U.S. Gypsum's current and
      potential future asbestos liabilities was completed. This analysis was
      based on the assumption that U.S. Gypsum's asbestos liability would
      continue to be resolved in the tort system.

      As part of this analysis, the Corporation and its independent consultant
      reviewed, among other things, the factors listed above as well as
      epidemiological data concerning the incidence of past and projected future
      asbestos-related diseases; trends in the propensity of persons alleging
      asbestos-related disease to sue U.S. Gypsum; the adverse effect on
      settlement costs of historical reductions in the number of solvent
      defendants available to pay claims, including reductions in membership of
      the Center; the pre-agreed settlement recommendations in, and the
      viability of, the Long-Term Settlements; anticipated trends in recruitment
      by plaintiffs' law firms of non-malignant or unimpaired claimants; future
      defense costs; and allegations that U.S. Gypsum and the other Center
      members bear joint liability for the share of certain settlement
      agreements that was to be paid by former members

                                      -33-


      that now have refused or are unable to pay. The study attempted to weigh
      relevant variables and assess the impact of likely outcomes on future case
      filings and settlement costs.

      Based upon the results of the actuarial study, the Corporation determined
      that, although substantial uncertainty remained, it was probable that
      asbestos claims pending against U.S. Gypsum and future asbestos claims to
      be filed against it through 2003 (both property damage and personal
      injury) could be resolved in the tort system for an amount between $889
      million and $1,281 million, including defense costs, and that within this
      range the most likely estimate was $1,185 million. Consistent with this
      analysis, in the fourth quarter of 2000, the Corporation recorded a pretax
      noncash charge of $850 million to results of operations, which, combined
      with the previously existing reserve, increased U.S. Gypsum's reserve for
      asbestos claims to $1,185 million. These amounts are stated before tax
      benefit and are not discounted to present value. Less than 10% of the
      reserve was attributable to defense and administrative costs.

      At the time of recording this reserve, it was expected that the reserve
      amounts would be expended over a period extending several years beyond
      2003, because asbestos cases in the tort system historically have been
      resolved an average of three years after filing. The Corporation concluded
      that it did not have adequate information to allow it to reasonably
      estimate the number of claims to be filed after 2003, or the liability
      associated with such claims.

      The Corporation believes that, as a result of the Filing and activities
      relating to potential federal legislation addressing asbestos personal
      injury claims, there is greater uncertainty in estimating the reasonably
      possible range of asbestos liability for pending and future claims as well
      as the most likely estimate of liability within this range. There are
      significant differences in the treatment of asbestos claims in a
      bankruptcy proceeding as compared to the tort litigation system. Among
      other things, these uncertainties include: (i) how the Long-Term
      Settlements will be treated in the bankruptcy proceeding and plan of
      reorganization and whether those settlements will be set aside; (ii) the
      number of asbestos claims that will be filed or addressed in the
      proceeding; (iii) the number of future claims that will be estimated in
      connection with preparing a plan of reorganization; (iv) how claims for
      punitive damages and claims by persons with no objective evidence of
      asbestos-related disease will be treated and whether such claims will be
      allowed or compensated; (v) the impact historical settlement values for
      asbestos claims may have on the estimation of asbestos liability in the
      bankruptcy proceeding; (vi) the results of any litigation proceedings in
      the Chapter 11 Cases regarding the estimated value of present and future
      asbestos personal injury claims alleging cancer or other diseases; (vii)
      the treatment of asbestos property damage claims in the bankruptcy
      proceeding; and (viii) the impact any relevant potential federal
      legislation may have on the proceeding. See Note 2. Voluntary
      Reorganization Under Chapter 11 - Potential

                                      -34-


      Federal Legislation Regarding Asbestos Personal Injury Claims. These
      factors, as well as the uncertainties discussed above in connection with
      the resolution of asbestos cases in the tort system, increase the
      uncertainty of any estimate of asbestos liability.

      As a result, it is the Corporation's view that no change should be made at
      this time to the previously recorded reserve for asbestos claims, except
      to reflect certain minor asbestos-related costs incurred since the Filing.
      The reserve as of June 30, 2004, which was determined based on claims
      expected to be filed against U.S. Gypsum through 2003, was $1,061 million.
      As the Chapter 11 Cases and legislation process proceed, the Debtors
      likely will gain more information from which a reasonable estimate of the
      Debtors' probable liability for present and future asbestos claims can be
      determined. If such estimate differs from the existing reserve, the
      reserve will be adjusted, and it is possible that a charge to results of
      operations will be necessary at that time. In such a case, the Debtors'
      asbestos liability could vary significantly from the recorded estimate of
      liability and could be greater than the high end of the range estimated in
      2000. This difference could be material to the Corporation's financial
      position, cash flows and results of operations in the period recorded.

      BOND TO SECURE CERTAIN CENTER OBLIGATIONS: In January 2001, U.S. Gypsum
      obtained a performance bond from Safeco Insurance Company of America
      ("Safeco") in the amount of $60.3 million to secure certain obligations of
      U.S. Gypsum for extended payout settlements of Personal Injury Cases and
      other obligations owed by U.S. Gypsum to the Center. The bond is secured
      by an irrevocable letter of credit obtained by the Corporation in the
      amount of $60.3 million and issued by JPMorgan Chase Bank (formerly Chase
      Manhattan Bank) ("JPMorgan Chase") to Safeco. After the Filing, by a
      letter dated November 16, 2001, the Center made a demand to Safeco for
      payment of $15.7 million under the bond, and, by a letter dated December
      28, 2001, the Center made a demand to Safeco for payment of approximately
      $127 million under the bond. The amounts for which the Center made demand
      were for the payment of, among other things, settlements of Personal
      Injury Cases that were entered into pre-petition. The total amount
      demanded by the Center under the bond, approximately $143 million, exceeds
      the original penal sum of the bond, which is $60.3 million. Safeco has not
      made any payment under the bond.

      On November 30, 2001, the Corporation and U.S. Gypsum filed an Adversary
      Complaint in the Chapter 11 Cases to, among other things, enjoin the
      Center from drawing on the bond and enjoin Safeco from paying on the bond
      during the pendency of these bankruptcy proceedings. This Adversary
      Proceeding is pending in the United States Bankruptcy Court for the
      District of Delaware and is captioned USG Corporation and United States
      Gypsum Company v. Center for Claims Resolution, Inc. and Safeco Insurance
      Company of America, No. 01-08932. Judge Wolin consolidated the Adversary
      Proceeding with similar adversary proceedings brought by Federal-Mogul
      Corp., et al., and Armstrong World Industries, Inc., et al., in their
      bankruptcy proceedings.

                                      -35-


      The parties filed cross-motions for summary judgment in the consolidated
      proceedings. On March 28, 2003, in response to the cross-motions for
      summary judgment, Judge Wolin issued an order and memorandum opinion which
      granted in part and denied in part the Center's motion for summary
      judgment. Although the court ruled that Safeco is not required to remit
      any surety bond proceeds to the Center at this time, the court stated that
      certain settlements that were completed before U.S. Gypsum's Petition Date
      likely are covered by the surety bond but that the bond does not cover
      settlement payments that were not yet completed as of the Petition Date.
      The court did not rule on whether the bond covers other disputed
      obligations and reserved these issues to a subsequent phase of the
      litigation. As a result of the court's decision, it is likely that, absent
      a settlement of this matter, some portion of the bond may be drawn but
      that the amount drawn may be substantially less than the full amount of
      the bond. To the extent that Safeco were to pay all or any portion of the
      bond, it is likely that Safeco would draw down the JPMorgan Chase letter
      of credit to cover the bond payment and JPMorgan Chase would assert a
      pre-petition claim in a corresponding amount against the Corporation in
      the bankruptcy proceeding.

      In light of the Third Circuit Court of Appeals order dated May 17, 2004,
      removing Judge Wolin from Debtors' Chapter 11 Cases, it is expected that
      the CCR bond litigation will be addressed by the district court judge
      ultimately assigned to the Debtors' Chapter 11 Cases.

      CONCLUSION: There are many uncertainties associated with the resolution of
      the asbestos liability in the bankruptcy proceeding. The Corporation will
      continue to review its asbestos liability as the Chapter 11 Cases progress
      and as issues relating to the estimation of the Debtors' asbestos
      liabilities are addressed. If such review results in the Debtors' estimate
      of the probable liability for present and future asbestos claims being
      different from the existing reserve, the reserve will be adjusted, and
      such adjustment could be material to the Corporation's financial position,
      cash flows and results of operations in the period recorded.

      ENVIRONMENTAL LITIGATION

      The Corporation and certain of its subsidiaries have been notified by
      state and federal environmental protection agencies of possible
      involvement as one of numerous "potentially responsible parties" in a
      number of so-called "Superfund" sites in the United States. In most of
      these sites, the involvement of the Corporation or its subsidiaries is
      expected to be minimal. The Corporation believes that appropriate reserves
      have been established for its potential liability in connection with all
      Superfund sites but is continuing to review its accruals as additional
      information becomes available. Such reserves take into account all known
      or estimated undiscounted costs associated with these sites, including
      site investigations and feasibility costs, site cleanup and remediation,
      legal costs, and fines and penalties, if any. In addition, environmental
      costs connected with site cleanups on Corporation-owned property also are
      covered by reserves

                                      -36-


      established in accordance with the foregoing. The Debtors have been given
      permission by the Bankruptcy Court to satisfy environmental obligations up
      to $12 million. The Corporation believes that neither these matters nor
      any other known governmental proceeding regarding environmental matters
      will have a material adverse effect upon its financial position, cash
      flows or results of operations.

                                      -37-


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS AND
FINANCIAL CONDITION

OVERVIEW

USG Corporation (the "Corporation") and 10 of its United States subsidiaries
(collectively, the "Debtors") are currently operating under chapter 11 of the
United States Bankruptcy Code (the "Bankruptcy Code"), an action taken to
resolve asbestos claims in a fair and equitable manner, to protect the long-term
value of the Debtors' businesses, and to maintain the Debtors' leadership
positions in their markets. To properly understand the Corporation and its
businesses, investors, creditors or other readers of this report should first
understand the nature of this voluntary reorganization process under chapter 11
and the potential impacts the reorganization may have on their rights and
interests in the Corporation as described in more detail below. At this point,
there is great uncertainty as to the amount of the Debtors' asbestos-related
liability and thus the value of any recovery for pre-petition creditors or
stockholders under any final plan of reorganization. No plan of reorganization
has thus far been proposed.

The Corporation had $973 million of cash, cash equivalents, restricted cash and
marketable securities as of June 30, 2004, and management believes that this
liquidity plus expected operating cash flows will meet the Corporation's cash
needs, including making regular capital investments to maintain and enhance its
businesses throughout the chapter 11 proceedings.

Net sales for the second quarter of 2004 were a record level for any quarter in
the Corporation's history and represented a 25% increase from the same period in
2003. Demand for products sold by the Corporation's North American Gypsum and
Building Products Distribution operating segments was strong in the second
quarter 2004 due to strength in the new housing and repair and remodel markets.
Shipments of gypsum wallboard were at record levels for the Corporation and the
industry in the second quarter and are expected to continue at relatively high
levels throughout the remainder of 2004. The strong level of activity in the
aforementioned markets and industry utilization rates in excess of 90% in the
second quarter have resulted in a rise of market selling prices for gypsum
wallboard. U.S. Gypsum's nationwide average realized selling price for
SHEETROCK(R) brand gypsum wallboard was up 18% versus the second quarter of
2003. The Corporation's Worldwide Ceilings operating segment also reported
increased second quarter sales as compared with the same period in 2003
primarily due to a surge in sales of ceiling grid in 2004 and the implementation
of new sales and distribution policies. Some grid customers increased purchases
in anticipation of reduced supply and higher grid prices associated with a
global shortage of steel and the related rise in the cost of steel.

The Corporation's gross margin was 18.9% in the second quarter of 2004, up from
14.7% in the second quarter of 2003. Gross margin improved as a result of
increased shipments and higher selling prices for most major product lines.
However, costs related to natural gas, employee benefits (pension and medical
insurance for active employees and retirees), steel used in the manufacture of
ceiling grid, and

                                      -38-


wastepaper used in the manufacture of gypsum wallboard continued to rise in the
second quarter and are expected to partially offset price improvement gains in
2004.

VOLUNTARY REORGANIZATION UNDER CHAPTER 11

On June 25, 2001 (the "Petition Date"), the Debtors filed voluntary petitions
for reorganization (the "Filing") under the Bankruptcy Code. These bankruptcy
cases (the "Chapter 11 Cases") are pending in the United States Bankruptcy Court
for the District of Delaware (the "Bankruptcy Court"). The Debtors intend to
address their liability for all present and future asbestos claims, as well as
all other pre-petition claims, in a plan or plans of reorganization approved by
the Bankruptcy Court. The Debtors currently have the exclusive right to file a
plan of reorganization until December 1, 2004. The Debtors may seek one or more
additional extensions of the exclusivity period depending upon developments in
the Chapter 11 Cases.

A key factor in determining the recovery of pre-petition creditors or
stockholders under any plan of reorganization is the amount that must be
provided in the plan to resolve the Debtors' liability for present and future
asbestos claims. At this time, there is substantial uncertainty as to the amount
that will be required to resolve these asbestos claims and thus whether or to
what extent there will be any recovery for pre-petition creditors or
stockholders under any plan of reorganization.

Our Annual Report on Form 10-K, filed February 24, 2004, discusses the
background and principal impacts of the Filing as well as potential federal
legislation regarding asbestos personal injury claims. During 2004, there have
been developments regarding potential federal legislation. On April 7, 2004, the
Fairness in Asbestos Injury Resolution Act of 2004 (Senate Bill 2290, the "FAIR
Bill") was introduced in the United States Senate. The FAIR Bill has not been
approved by the Senate, has not been introduced in the House of Representatives,
and is not law.

The FAIR Bill introduced in the Senate is intended to establish a nationally
administered trust fund to compensate asbestos personal injury claimants. In the
FAIR Bill's current form, companies that have made past payments for asbestos
personal injury claims would be required to contribute amounts to a national
trust fund on a periodic basis that would pay the claims of qualifying asbestos
personal injury claimants. The nationally administered trust fund would be the
exclusive remedy for asbestos personal injury claims, and such claims could not
be brought in state or federal court as long as such claims are being
compensated under the national trust fund.

In the FAIR Bill's current form, the amounts to be paid to the national fund are
based on an allocation methodology set forth in the FAIR Bill. The amounts that
participants, including the Debtors, would be required to pay are not
dischargeable in a bankruptcy proceeding. The FAIR Bill also provides, among
other things, that

                                      -39-


the national trust fund shall cease paying new claims if it is determined that
the money in the trust fund is not sufficient to compensate eligible claimants.
In such a case, under the terms of the current FAIR Bill, the claimants and
defendants would return to the federal court system to resolve claims not paid
by the national trust fund. The text of the FAIR Bill as introduced in the
Senate may be found at http://thomas.loc.gov (type in bill number "S. 2290").

Enactment of the FAIR Bill or similar legislation addressing the financial
contributions of the Debtors for asbestos personal injury claims would have a
material impact on the amount of the Debtor's asbestos personal injury liability
and Debtors' Chapter 11 Cases.

The outcome of the legislative process, however, is inherently speculative, and
it cannot be known whether the FAIR Bill or similar legislation will ever be
enacted or, even if enacted, what the terms of the final legislation might be.
Many labor organizations, including the AFL-CIO, as well as some Senators, have
indicated that they oppose the FAIR Bill as introduced because, among other
things, they believe that the FAIR Bill does not provide sufficient compensation
to asbestos claimants. On April 22, 2004, the Senate defeated a motion to
proceed with floor consideration of the FAIR Bill. Discussions continue
regarding possible revisions to the FAIR Bill that would allow it to move
forward, but it is unclear whether these discussions will produce agreements on
key issues. It is likely that even if the FAIR Bill is enacted, the terms of the
enacted legislation will be different from the current FAIR Bill, and those
differences may be material to the FAIR Bill's impact on the Corporation.

During the legislative process, proceedings in the Debtors' Chapter 11 Cases
have continued. On May 17, 2004, the Third Circuit Court of Appeals ordered that
Judge Alfred M. Wolin be removed from presiding over the Debtors' Chapter 11
Cases, and, effective June 30, 2004, Judge Wolin resigned as a district court
judge. The Debtors' Chapter 11 Cases have not yet been reassigned to a new
district court judge.

In the second quarter of 2004, Judge Judith K. Fitzgerald, the bankruptcy judge
presiding over the Debtors' Chapter 11 Cases, entered an order directing the
parties to enter into non-binding mediation relating to the Debtors' asbestos
personal injury liability and the potential terms of a plan of reorganization.
Judge Fitzgerald appointed David Geronemus as mediator. It is expected that the
mediation will begin in the third quarter of 2004.

The Debtors were recently informed by the mediator that the legal representative
for future asbestos claimants has raised the issue of whether USG Corporation
and its subsidiaries may be liable for asbestos personal injury claims arising
from the sale of asbestos-containing products by A.P. Green Refractories Co.
("A.P. Green") before 1967. A.P. Green, which manufactured and sold products
used in refractories, was acquired by merger into U.S. Gypsum Company in 1967
and thereafter operated as a wholly-owned subsidiary of U.S. Gypsum Company
until 1985, at which time A.P. Green became a wholly-owned subsidiary of USG
Corporation. In 1988, A.P. Green

                                      -40-


became a publicly-traded company when its shares were distributed to the
shareholders of USG Corporation. In February 2002, A.P. Green (now known as A.P.
Green Industries, Inc.), as well as its parent company, Global Industrial
Technologies, Inc., and other affiliates, filed voluntary petitions for
reorganization through which A.P. Green and its affiliates seek to resolve their
asbestos-related liabilities. The A.P. Green reorganization proceeding is
pending in the United States Bankruptcy Court for the Western District of
Pennsylvania and is captioned In re: Global Industrial Technologies, Inc. (Case
No. 02-21626). The Corporation does not have sufficient information at this time
to predict whether or how any plan of reorganization in the Debtors' Chapter 11
Cases might address any asbestos-related liability based on sales of
asbestos-containing products by A.P. Green.

The legal representative for future asbestos claimants and the Official
Committee of Asbestos Personal Injury Claimants have also recently raised the
issue of whether the assets and liabilities of all Debtors should be temporarily
consolidated for purposes of the treatment of claims under a plan of
reorganization. Under this theory, which is sometimes called "substantive
consolidation," the liabilities of all Debtors subject to this consolidation,
including liabilities based on sales of asbestos-containing products by U.S.
Gypsum, would be paid from the pooled assets of U.S. Gypsum and all other
Debtors subject to consolidation. If applied, substantive consolidation could
materially and adversely affect the recovery rights of creditors of Debtors
other than U.S. Gypsum and the holders of the Corporation's equity.

See Item 1, Note 13. Litigation, for additional information on the background of
asbestos litigation, developments in the Corporation's reorganization
proceeding, and estimated cost.

ACCOUNTING IMPACT

The Corporation is required to follow American Institute of Certified Public
Accountants ("AICPA") Statement of Position 90-7 ("SOP 90-7"), "Financial
Reporting by Entities in Reorganization under the Bankruptcy Code." Pursuant to
SOP 90-7, the Corporation's pre-petition liabilities that are subject to
compromise are reported separately on the consolidated balance sheet. Virtually
all of the Corporation's pre-petition debt is currently in default and was
recorded at face value and classified within liabilities subject to compromise.
U.S. Gypsum's asbestos liability also is classified within liabilities subject
to compromise. See Item 1. Note 2. Voluntary Reorganization Under Chapter 11,
which includes information related to financial statement presentation, the
debtor-in-possession statements and detail of liabilities subject to compromise
and chapter 11 reorganization expenses.

CONSOLIDATED RESULTS OF OPERATIONS

NET SALES

Net sales in the second quarter of 2004 totaled $1,145 million, a record for any
quarter in the Corporation's history and a 25% increase from $914 million in the

                                      -41-


second quarter of 2004 totaled $1,145 million, a record for any quarter in the
Corporation's history and a 25% increase from $914 million in the second quarter
of 2003. For the first six months of 2004, net sales totaled $2,165 million, up
22% from $1,776 million in the comparable 2003 period. Net sales are up for all
three of the Corporation's operating segments in 2004 primarily due to increased
shipments and higher selling prices for most major product lines. See Core
Business Results of Operations below for an explanation of product line results
by segment.

COST OF PRODUCTS SOLD

Cost of products sold in the second quarter of 2004 was $929 million, up 19%
from $780 million a year ago. For the first six months of 2004, cost of products
sold totaled $1,778 million, up 17% from $1,525 million in the comparable 2003
period. Key factors for these variations were increased product volume and
higher costs related to natural gas, employee benefits (pension and medical
insurance for active employees and retirees), steel used in the manufacture of
ceiling grid, and wastepaper used in the manufacture of gypsum wallboard.

GROSS PROFIT

Gross profit (net sales less cost of products sold) in the second quarter of
2004 was $216 million, a 61% increase from $134 million in the second quarter of
2003. For the first six months of 2004, gross profit totaled $387 million, up
54% from $251 million in the comparable 2003 period. Gross margin (gross profit
as a percent of net sales) was 18.9% in the second quarter of 2004, up from
14.7% in the second quarter of 2003. For the first six months of 2004, gross
margin was 17.9%, up from 14.1% in the comparable 2003 period.

SELLING AND ADMINISTRATIVE EXPENSES

Selling and administrative expenses in the second quarter of 2004 were $79
million (6.9% of net sales), down 2% from $81 million (8.9% of net sales) in the
second quarter of 2003. For the first six months, these expenses were $156
million (7.2% of net sales), versus $161 million (9.1% of net sales) a year ago.
These reductions primarily reflected a lower accrual related to the Bankruptcy
Court-approved key employee retention plan, the impact of a fourth quarter 2003
salaried workforce reduction program and other cost-reduction initiatives that
have resulted in lower overall expenses. These favorable factors were offset in
part by higher employee benefit costs (pension and medical insurance for active
employees and retirees).

CHAPTER 11 REORGANIZATION EXPENSES

Chapter 11 reorganization expenses in the consolidated and debtor-in-possession
statements of earnings consisted of the following (dollars in millions):



                                                        Three Months                              Six Months
                                                       ended June 30,                            ended June 30,
                                                 ------------------------                  ------------------------
                                                  2004              2003                    2004              2003
                                                 ------            ------                  ------            ------
                                                                                                 
Legal and financial advisory fees                $    6            $    5                  $   10            $    9
Bankruptcy-related interest income                   (2)               (2)                     (4)               (4)
                                                 ------            ------                  ------            ------
Total chapter 11 reorganization expenses              4                 3                       6                 5
                                                 ======            ======                  ======            ======


                                      -42-



OPERATING PROFIT

Operating profit in the second quarter of 2004 was $133 million compared with
$50 million in the second quarter of 2003. Operating profit for the first six
months of 2004 was $225 million compared with $85 million for the first six
months of 2003.

INTEREST EXPENSE

Interest expense of $1 million and $2 million was incurred in the second quarter
and first six months of 2004, respectively. Interest expense for the respective
2003 periods was $2 million and $3 million. Under SOP 90-7, virtually all of the
Corporation's outstanding debt is classified as liabilities subject to
compromise, and interest expense on this debt has not been accrued or recorded
since the Petition Date. For the second quarter and first six months of 2004,
contractual interest expense not accrued or recorded on pre-petition debt
totaled $18 million and $35 million, respectively. From the Petition Date
through June 30, 2004, contractual interest expense not accrued or recorded on
pre-petition debt totaled $221 million. Although no post-petition accruals are
required to be made for such contractual interest expense, debtholders may seek
to recover such amounts in the Chapter 11 Cases.

INTEREST INCOME

Non-bankruptcy related interest income was $1 million in the second quarter and
$2 million in the first six months of 2004, unchanged from the respective 2003
periods.

INCOME TAXES

Income tax expense amounted to $52 million and $85 million in the second quarter
and first six months of 2004, respectively, compared with $23 million and $36
million in the corresponding 2003 periods. The effective tax rates were 38.4%
and 39.9% for the first six months of 2004 and 2003, respectively. The decrease
in the effective tax rate was primarily due to a reduction in the Corporation's
tax reserves resulting from the application of recently finalized IRS
regulations to the Chapter 11 reorganization expenses incurred by the
Corporation through 2003 and the impact on the effective tax rate of a similar
amount of permanent differences but a higher amount of pretax earnings in the
first six months of 2004 versus the prior-year period.

CUMULATIVE EFFECT OF ACCOUNTING CHANGE

On January 1, 2003, the Corporation adopted Statement of Financial Accounting
Standards ("SFAS") No. 143, "Accounting for Asset Retirement Obligations." A
non-cash, after-tax charge of $16 million ($27 million pretax) was reflected on
the consolidated statement of earnings as a cumulative effect of a change in
accounting principle as of January 1, 2003. See Item 1. Note 6. Asset Retirement
Obligations for additional information related to the adoption of SFAS No. 143.

NET EARNINGS

Net earnings of $80 million, or $1.86 per share, were reported for the second
quarter of 2004 compared with $31 million, or $0.73 per share, for the second

                                      -43-



quarter of 2003. For the first six months of 2004, net earnings totaled $137
million, or $3.18 per share, compared with $37 million, or $0.86 per share, for
the first six months of 2003.

CORE BUSINESS RESULTS OF OPERATIONS

(dollars in millions)



                                                   THREE MONTHS                        SIX MONTHS
                                                  ENDED JUNE 30,                      ENDED JUNE 30,
                                            -------------------------           -------------------------
                                              2004              2003              2004              2003
                                            -------           -------           -------           -------
                                                                                      
NET SALES:

NORTH AMERICAN GYPSUM:
U.S. Gypsum Company                         $   617           $   512           $ 1,191           $ 1,008
CGC Inc. (gypsum)                                68                62               141               119
Other subsidiaries*                              44                35                80                63
Eliminations                                    (51)              (43)              (95)              (82)
                                            -------           -------           -------           -------
Total                                           678               566             1,317             1,108
                                            -------           -------           -------           -------
WORLDWIDE CEILINGS:
USG Interiors, Inc.                             135               114               255               224
USG International                                54                42               100                82
CGC Inc. (ceilings)                              15                12                28                22
Eliminations                                    (14)              (14)              (27)              (27)
                                            -------           -------           -------           -------
Total                                           190               154               356               301
                                            -------           -------           -------           -------
BUILDING PRODUCTS DISTRIBUTION:
L&W Supply Corporation                          454               325               816               620
                                            -------           -------           -------           -------
Eliminations                                   (177)             (131)             (324)             (253)
                                            -------           -------           -------           -------
Total USG Corporation                         1,145               914             2,165             1,776
                                            =======           =======           =======           =======

OPERATING PROFIT:

NORTH AMERICAN GYPSUM:
U.S. Gypsum Company                              87                36               148                66
CGC Inc. (gypsum)                                 9                 7                22                12
Other subsidiaries*                               6                 4                13                 7
                                            -------           -------           -------           -------
Total                                           102                47               183                85
                                            -------           -------           -------           -------
WORLDWIDE CEILINGS:
USG Interiors, Inc.                              19                 7                31                13
USG International                                 4                 1                 5                 2
CGC Inc. (ceilings)                               3                 1                 5                 2
                                            -------           -------           -------           -------
Total                                            26                 9                41                17
                                            -------           -------           -------           -------
BUILDING PRODUCTS DISTRIBUTION:
L&W Supply Corporation                           31                16                45                24
                                            -------           -------           -------           -------
Corporate                                       (20)              (18)              (36)              (36)
Chapter 11 reorganization expenses               (4)               (3)               (6)               (5)
Eliminations                                     (2)               (1)               (2)                -
                                            -------           -------           -------           -------
Total USG Corporation                           133                50               225                85
                                            =======           =======           =======           =======


*Includes USG Mexico, S.A. de C.V., a building products business in Mexico,
Gypsum Transportation Limited, a shipping company in Bermuda, and USG Canadian
Mining Ltd., a mining operation in Nova Scotia.

                                      -44-



NORTH AMERICAN GYPSUM

Net sales of $678 million increased 20% from the second quarter of 2003, while
operating profit more than doubled to $102 million. First six months net sales
of $1,317 million reflected an increase of 19% from a year ago, while operating
profit of $183 million increased 115%.

For the second quarter of 2004, net sales for U.S. Gypsum increased $105
million, or 21%, compared with the second quarter of 2003, while operating
profit rose $51 million, or 142%. These increases primarily reflected record
shipments of SHEETROCK(R) brand gypsum wallboard and joint compound, DUROCK(R)
brand cement board and FIBEROCK(R) brand gypsum fiber panels and increased
selling prices for SHEETROCK(R) brand gypsum wallboard.

U.S. Gypsum sold 2.8 billion square feet of SHEETROCK(R) brand gypsum wallboard
during the second quarter of 2004, a record for any quarter and an 8% increase
from 2.6 billion square feet sold in the second quarter of 2003. U.S. Gypsum's
wallboard plants operated at 95% of capacity in the second quarter of 2004
compared with 90% in the second quarter of 2003. Industry shipments of gypsum
wallboard were up approximately 12% from the second quarter of 2003.

U.S. Gypsum's nationwide average realized selling price for SHEETROCK(R) brand
gypsum wallboard was $118.47 per thousand square feet in the second quarter of
2004. This price was up 18% from $100.47 in the second quarter of 2003 and up 7%
from $110.33 in the first quarter of 2004.

The improved pricing and record shipments for gypsum wallboard more than offset
the unfavorable effects of higher costs for wastepaper (the primary raw material
of wallboard paper), natural gas (a major source of energy for the company) and
employee benefits. However, improved production efficiencies at the company's
gypsum wallboard plants offset a portion of the cost increase.

Net sales for the gypsum business of Canada-based CGC Inc. increased $6 million
or 10% and operating profit rose $2 million, or 29%, as compared with the second
quarter of 2003. These results were primarily attributable to higher shipments
of SHEETROCK(R) brand gypsum wallboard partially offset by slightly lower
wallboard and joint compound selling prices.

WORLDWIDE CEILINGS

Second quarter 2004 net sales of $190 million increased 23%, while operating
profit nearly tripled to $26 million as compared with the second quarter of
2003. For the first six months of 2004, net sales of $356 million were up 18%,
while operating profit increased to $41 million from $17 million a year ago.

USG Interiors, Inc., the Corporation's domestic ceilings business, reported a
$21 million, or 18%, increase in net sales compared with the second quarter of
2003, while operating profit increased to $19 million from $7 million. Increased
volume and higher selling prices for ceiling grid largely reflected a surge in
demand for ceiling grid in 2004 due to customer concerns over reduced supply and
higher grid

                                      -45-



prices associated with a global shortage of steel and the related rise in the
cost of steel. The cost of steel used in the manufacture of ceiling grid rose
significantly during the first half of 2004. The Corporation expects that due to
current demand for steel, the cost of steel will continue to rise during the
second half of 2004 but at a lesser rate than for the first half of the year.
The favorable grid results, as well as higher selling prices for ceiling tile,
also were positively impacted by the company's new sales and distribution
policies.

USG International's second quarter 2004 net sales improved 29% and operating
profit rose to $4 million from $1 million versus the second quarter of 2003
primarily due to increased demand for ceiling grid in Europe.

The ceilings business of CGC Inc. reported a $3 million increase in net sales
and a $2 million increase in operating profit for the second quarter of 2004.

BUILDING PRODUCTS DISTRIBUTION

L&W Supply Corporation ("L&W Supply"), the leading specialty building products
distribution business in the United States, reported second quarter net sales of
$454 million and operating profit of $31 million, representing increases of 40%
and 94% respectively, from the second quarter of 2003. For the first six months
of 2004, net sales of $816 million and operating profit of $45 million increased
32% and 88%, respectively, versus the first six months of 2003. These increases
reflected record shipments and improved pricing of gypsum wallboard and
complementary building products, such as drywall metal, ceiling products, joint
compound and roofing. Second quarter 2004 shipments of L&W Supply's gypsum
wallboard were up 12% versus the same prior year period, while selling prices
increased 14%.

L&W Supply operated 184 locations in the United States as of June 30, 2004,
compared with 183 locations as of June 30, 2003.

MARKET CONDITIONS AND OUTLOOK

The gypsum industry experienced a record level of wallboard shipments in the
second quarter of 2004 attributable to continued strength in the new housing and
the residential remodeling markets. The robust level of activity in these
markets, which together account for nearly two-thirds of all demand for gypsum
wallboard, and utilization rates in excess of 90% for the industry, have
resulted in a rise of market selling prices for gypsum wallboard.

The outlook for the balance of the year remains favorable. The strength of the
residential market is expected to continue, although the exceptional strength of
the first half of the year may abate in the second half. Increasing mortgage
rates may affect the level of demand in both the new housing and residential
remodeling markets. The commercial construction market, the principal market for
the Corporation's ceilings products, is showing signs of improvement, but office
vacancy rates remain at very high levels.

                                      -46-



In addition, the Corporation, like many other companies, faces many ongoing cost
pressures such as higher prices for natural gas and raw materials and increased
employee benefits.

The Corporation continues to focus its management attention and investments on
improving customer service, manufacturing costs and operating efficiencies, as
well as selectively investing to grow its businesses. In addition, the
Corporation will diligently continue its attempt to resolve the chapter 11
proceedings, consistent with the goal of achieving a fair, comprehensive and
final resolution to its asbestos liability.

LIQUIDITY AND CAPITAL RESOURCES

LIQUIDITY

As of June 30, 2004, the Corporation had $973 million of cash, cash equivalents,
restricted cash and marketable securities, of which $227 million of cash and
cash equivalents was held by non-Debtor subsidiaries. The total amount of $973
million was up $26 million, or 3%, from $947 million as of December 31, 2003.
Since the Petition Date, the Corporation's level of liquidity has increased due
to strong operating cash flows and the absence of cash payments related to
asbestos settlements and principal and interest on pre-petition debt.
Contractual interest expense not accrued or recorded on pre-petition debt was
$35 million in the first six months of 2004 and $221 million since the Petition
Date.

CASH FLOWS

As shown on the consolidated statement of cash flows, cash and cash equivalents
decreased $36 million during the first six months of 2004. The primary source of
cash in the first half of 2004 was earnings from operations. Primary uses of
cash were: (i) working capital of $151 million (largely customer rebates,
employee incentive compensation and other seasonal needs), (ii) net purchases of
marketable securities of $36 million, (iii) capital spending of $47 million,
(iv) the designation of $26 million as restricted cash representing cash
collateral primarily to support outstanding letters of credit issued mainly for
purchases of steel from foreign suppliers and (v) the use of $4 million for an
acquisition.

Net cash from operating activities was $71 million during the first six months
of 2004 compared with $4 million used for operating activities during the same
period in 2003. This variation was primarily attributable to the increase in
2004 earnings from operations. Net cash used for investing activities decreased
to $81 million from $95 million primarily due to lower net purchases of
marketable securities in 2004. Net cash used for financing activities of $26
million (the designation of restricted cash as described above) during the first
half of 2004 represented a $5 million increase versus the first half of 2003.

WORKING CAPITAL

Total working capital (current assets less current liabilities) as of June 30,
2004, amounted to $1,226 million, and the ratio of current assets to current

                                      -47-



liabilities was 3.43-to-1. As of December 31, 2003, working capital amounted to
$1,084 million, and the ratio of current assets to current liabilities was
3.62-to-1.

Receivables increased to $488 million as of June 30, 2004, from $321 million as
of December 31, 2003, primarily reflecting a 37% increase in net sales for the
month of June 2004 as compared with December 2003. Inventories and payables also
were up from December 31, 2003, primarily due to the increased level of
business. Inventories increased to $357 million from $280 million, and accounts
payable increased to $274 million from $202 million. Accrued expenses declined
slightly to $203 million from $206 million as of December 31, 2003.

MARKETABLE SECURITIES

As of June 30, 2004, $276 million was invested in marketable securities, up $36
million from $240 million as of December 31, 2003. Of the June 30, 2004 amount,
$211 million was invested in long-term marketable securities and $65 million in
short-term marketable securities. The Corporation's marketable securities are
classified as available-for-sale securities and reported at fair market value
with unrealized gains and losses excluded from earnings and reported in
accumulated other comprehensive income (loss) on the consolidated balance sheet.

CAPITAL EXPENDITURES

Capital spending amounted to $47 million in the first six months of 2004,
compared with $36 million in 2003. As of June 30, 2004, remaining capital
expenditure commitments for the replacement, modernization and expansion of
operations amounted to $128 million, compared with $95 million as of December
31, 2003.

During the bankruptcy proceeding, the Corporation expects to have limited
ability to access capital other than its own cash, marketable securities and
future cash flows to fund potential future growth opportunities such as new
products, acquisitions and joint ventures. Nonetheless, the Corporation expects
to be able to pursue a program of capital spending aimed at maintaining and
enhancing its businesses.

RESTRICTED CASH AND LETTERS OF CREDIT

The Corporation has a $100 million credit agreement, which expires April 30,
2006, with LaSalle Bank N.A. (the "LaSalle Facility") to be used exclusively to
support the issuance of letters of credit needed to support business operations.
As of June 30, 2004, $25 million of letters of credit, which are cash
collateralized at 103%, were outstanding.

The Corporation has posted additional cash collateral in the amount of $7
million to support outstanding letters of credit and a bank guarantee issued by
Commerzbank in Germany.

As of June 30, 2004, a total of $33 million was reported as restricted cash on
the consolidated balance sheet.

                                      -48-



DEBT

As of June 30, 2004, total debt amounted to $1,007 million, of which $1,005
million was included in liabilities subject to compromise. These amounts were
unchanged from the December 31, 2003, levels and do not include any accruals for
post-petition contractual interest expense.

EXIT ACTIVITIES

In the fourth quarter of 2003, the Corporation recorded a charge of $3 million
pretax ($2 million after-tax) for severance related to a salaried workforce
reduction of approximately 70 employees. An additional 56 open positions were
eliminated. Payments totaling $1 million were made in the fourth quarter of
2003, and a reserve of $2 million was included in accrued expenses on the
consolidated balance sheet as of December 31, 2003. The remaining payments of $2
million were made in the first quarter of 2004.

LEGAL CONTINGENCIES

As a result of the Filing, all pending asbestos lawsuits against the Debtors are
stayed, and no party may take any action to pursue or collect on such asbestos
claims absent specific authorization of the Bankruptcy Court. See Item 1. Note
13. Litigation for additional information on the background of asbestos
litigation, developments in the Corporation's reorganization proceeding and
estimated cost.

The Corporation and certain of its subsidiaries have been notified by state and
federal environmental protection agencies of possible involvement as one of
numerous "potentially responsible parties" in a number of so-called "Superfund"
sites in the United States. The Corporation believes that neither these matters
nor any other known governmental proceeding regarding environmental matters will
have a material adverse effect upon its financial position, cash flows or
results of operations. See Item 1. Note 13. Litigation for additional
information on environmental litigation.

CRITICAL ACCOUNTING POLICIES

The preparation of the Corporation's financial statements requires management to
make estimates, judgments and assumptions that affect the reported amounts of
assets, liabilities, revenues and expenses during the periods presented. The
Corporation's 2003 Annual Report on Form 10-K, which was filed on February 24,
2004, includes a summary of the critical accounting policies the Corporation
believes are the most important to aid in understanding its financial results.
There have been no material changes to these critical accounting policies that
impacted the Corporation's reported amounts of assets, liabilities, revenues or
expenses during the first half of 2004.

                                      -49-



FORWARD-LOOKING STATEMENTS

This report contains forward-looking statements related to management's
expectations about future conditions. The effects of the Filing and the conduct,
outcome and costs of the Chapter 11 Cases, as well as the ultimate costs
associated with the Corporation's asbestos litigation, including the possible
impact of any asbestos-related legislation, may differ from management's
expectations. Actual business or other conditions may also differ from
management's expectations and accordingly affect the Corporation's sales and
profitability or other results. Actual results may differ due to various other
factors, including economic conditions such as the levels of construction
activity, employment levels, interest rates, currency exchange rates and
consumer confidence; competitive conditions such as price and product
competition; shortages in raw materials; increases in raw materials and energy
costs; and the unpredictable effects of acts of terrorism or war upon domestic
and international economies and financial markets. The Corporation assumes no
obligation to update any forward-looking information contained in this report.

ITEM 4. CONTROLS AND PROCEDURES

(a)   Evaluation of disclosure controls and procedures.

The Corporation's chief executive officer and chief financial officer, after
evaluating the effectiveness of the Corporation's "disclosure controls and
procedures" (as defined in Rule 13a-15(e) of the Securities Exchange Act of
1934), have concluded that, as of the end of the fiscal quarter covered by this
report on Form 10-Q, the Corporation's disclosure controls and procedures were
adequate and designed to ensure that material information relating to the
Corporation and its consolidated subsidiaries would be made known to them by
others within those entities.

(b)   Changes in internal control over financial reporting.

There was no change in the Corporation's "internal control over financial
reporting" (as defined in Rule 13a-15(f) of the Securities Exchange Act of 1934)
identified in connection with the evaluation required by Rule 13a-15(d) of the
Securities Exchange Act of 1934 that occurred during the fiscal quarter covered
by this report on Form 10-Q that has materially affected, or is reasonably
likely to materially affect, the Corporation's internal control over financial
reporting.

                                      -50-



             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and Board of Directors of USG Corporation:

We have reviewed the accompanying consolidated balance sheets of USG Corporation
and subsidiaries as of June 30, 2004 and the related consolidated statements of
earnings for the three month and six month periods ended June 30, 2004 and 2003
and the consolidated statements of cash flows for the six month periods ended
June 30, 2004 and 2003. These interim financial statements are the
responsibility of the Corporation's management.

We conducted our reviews in accordance with standards of the Public Company
Accounting Oversight Board (United States). A review of interim financial
information consists principally of applying analytical procedures and making
inquiries of persons responsible for financial and accounting matters. It is
substantially less in scope than an audit conducted in accordance with standards
of the Public Company Accounting Oversight Board (United States), the objective
of which is the expression of an opinion regarding the financial statements
taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should
be made to the accompanying consolidated interim financial statements for them
to be in conformity with accounting principles generally accepted in the United
States of America.

We have previously audited, in accordance with standards of the Public Company
Accounting Oversight Board (United States), the consolidated balance sheets of
USG Corporation and subsidiaries as of December 31, 2003 and 2002, and the
related consolidated statements of earnings, stockholders' equity, and cash
flows for each of the two years then ended (not presented herein); and in our
report dated February 10, 2004 we expressed an unqualified opinion on those
consolidated financial statements and included explanatory paragraphs concerning
(i) matters which raise substantial doubt about the Corporation's ability to
continue as a going concern; (ii) changes in methods of accounting for asset
retirement obligations and goodwill and other intangible assets due to the
Corporation's adoption of Statement of Financial Accounting Standards (SFAS) No.
143, "Accounting for Asset Retirement Obligations" in 2003, and SFAS No. 142,
"Goodwill and Other Intangible Assets" in 2002; and (iii) the application of
procedures relating to certain disclosures of financial statement amounts
related to the 2001 financial statements that were audited by other auditors who
have ceased operations and for which we have expressed no opinion or other form
of assurance other than with respect to such disclosures. In our opinion, the
information set forth in the accompanying condensed consolidated balance sheet
as of December 31, 2003 is fairly stated, in all material respects, in relation
to the consolidated balance sheet from which it has been derived.

                                      -51-



As discussed in Note 2 to the consolidated financial statements, USG Corporation
and certain subsidiaries voluntarily filed for Chapter 11 bankruptcy protection
on June 25, 2001. The accompanying consolidated financial statements do not
purport to reflect or provide for the consequences of the bankruptcy
proceedings. In particular, such financial statements do not purport to show (a)
as to assets, their realizable value on a liquidation basis or their
availability to satisfy liabilities; (b) as to pre-petition liabilities, the
amounts that may be allowed for claims or contingencies, or the status and
priority thereof; (c) as to stockholder accounts, the effect of any changes that
may be made in the capitalization of the Corporation; or (d) as to operations,
the effect of any changes that may be made in its business.

The accompanying consolidated financial statements have been prepared assuming
that the Corporation will continue as a going concern. As discussed in Notes 2
and 13 to the consolidated financial statements, there is significant
uncertainty as to the resolution of the Corporation's asbestos litigation,
which, among other things, may lead to possible changes in the composition of
the Corporation's business portfolio, as well as changes in the ownership of the
Corporation. This uncertainty raises substantial doubt about the Corporation's
ability to continue as a going concern. Management's plans in regard to these
matters are also described in Notes 2 and 13 to the financial statements. The
financial statements do not include any adjustments that might result from the
outcome of this uncertainty.

/s/ DELOITTE & TOUCHE LLP

DELOITTE & TOUCHE LLP

Chicago, Illinois

July 28, 2004

                                      -52-



PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

See Part I, Item 1. Note 13. Litigation for information concerning the asbestos
and related bankruptcy litigation and environmental litigation.

ITEM 2. CHANGES IN SECURITIES, USE OF PROCEEDS AND/OR ISSUER PURCHASES OF EQUITY
SECURITIES



                                                                              (c) Total Number of         (c) Maximum Number (or
                                                                               Shares (or Units)         Approximate Dollar Value)
                          (a) Total Number of     (b) Average Price           Purchased as Part of          of Shares (or Units)
                          of Shares (or Units)    Paid per Share (or          Publicly Announced         that May Yet Be Purchased
     Period                    Purchased                 Unit)                 Plans or Programs        Under the Plans or Programs
- -----------------         --------------------    ------------------          --------------------      ---------------------------
                                                                                            
2004

January                             21,877             $  16.58                        -                            -
February                            10,643                18.85                        -                            -
March                                    -                    -                        -                            -
                              ------------             --------                       ---                          ---
Total 1st Quarter                   32,520                17.72                        -                            -
                              ------------             --------                       ---                          ---

April                                    -                    -                        -                            -
May                                      -                    -                        -                            -
June                                 1,973                15.45                        -                            -
                              ------------             --------                       ---                          ---
Total 2nd Quarter                    1,973                15.45                        -                            -
                              ------------             --------                       ---                          ---


(a)   Reflects shares reacquired to provide for tax withholdings on shares
      issued to employees under the terms of the USG Corporation 1995 Long-Term
      Equity Plan, 1997 Management Incentive Plan or 2000 Omnibus Management
      Incentive Plan.

(b)   The price per share is based upon the mean of the high and the low prices
      for a USG Corporation common share on the NYSE on the date of the tax
      withholding transaction.

(c)   The Corporation currently does not have in place a share repurchase plan
      or program.

                                      -53-



ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

      (a)   In accordance with the Corporation's notice and proxy statement
            dated April 1, 2004, the matters set forth in paragraphs (b) and (c)
            below were submitted to a vote of stockholders at its May 12, 2004
            annual meeting of stockholders.

      (b)   The three director-nominees (Lawrence M. Crutcher, William C. Foote
            and Judith A. Sprieser) were each re-elected to a three-year term of
            office which will expire in 2007. The directors whose terms of
            office continued after the annual meeting of stockholders were:
            Robert L. Barnett, Keith A. Brown, James C. Cotting, W. Douglas
            Ford, David W. Fox, Valerie B. Jarrett, Marvin E. Lesser and John B.
            Schwemm.



                                                        Votes                  Abstentions
                                   Votes               Withheld                and Broker
                                    For               or Against                Non-Votes
                                ----------            ----------               -----------
                                                                      
Election of Directors:
Lawrence M. Crutcher            39,694,196              341,418                    -
William C. Foote                39,703,838              331,776                    -
Judith A. Sprieser              39,698,849              336,765                    -


      (c)   The following proposal was recommended by the Corporation's Board of
            Directors and was approved by a majority of the shares voted.



                                                                  Votes                  Abstentions
                                             Votes               Withheld                and Broker
                                              For               or Against                Non-Votes
                                          ----------            ----------               -----------
                                                                                
Ratification of Appointment of
Deloitte & Touche LLP as Independent
Public Accountants                        39,760,275              192,418                   82,921


                                      -54-



ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

(a)   Exhibits:

      3(ii) Amended and Restated By-Laws of USG Corporation, dated May 12, 2004.

      10.   Key Employee Retention Plan (July 1, 2004 - December 31, 2005),
            dated July 1, 2004.

      15.   Letter from Deloitte & Touche LLP regarding unaudited financial
            information.

      31.1  Rule 13a - 14(a) Certifications of USG Corporation's Chief Executive
            Officer

      31.2  Rule 13a - 14(a) Certifications of USG Corporation's Chief Financial
            Officer

      32.1  Section 1350 Certifications of USG Corporation's Chief Executive
            Officer

      32.2  Section 1350 Certifications of USG Corporation's Chief Financial
            Officer

(b)   Reports on Form 8-K:

      On April 28, 2004, the Corporation furnished to the SEC a Form 8-K for the
      purpose of disclosing, under "Item 12. Results of Operations and Financial
      Condition," its press release containing earnings release information for
      its first quarter of 2004.

      On May 18, 2004, the Corporation filed with the SEC a Form 8-K for the
      purpose of disclosing, under "Item 5. Other Events," that it had amended
      its bylaws.

                                      -55-



                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                          USG CORPORATION

                                          By /s/ William C. Foote
                                             -----------------------------------

                                             William C. Foote,
                                             Chairman, Chief Executive Officer
                                             and President

                                          By /s/ Richard H. Fleming
                                             -----------------------------------

                                             Richard H. Fleming,
                                             Executive Vice President and
                                             Chief Financial Officer

                                          By /s/ D. Rick Lowes
                                             -----------------------------------

                                             D. Rick Lowes,
                                             Vice President and Controller

July 30, 2004

                                      -56-