Exhibit (10)


                          THIRD AMENDMENT
                    Dated as of August 11, 1994
                                to
               AMENDED AND RESTATED CREDIT AGREEMENT
                      Dated as of May 6, 1993


          This THIRD AMENDMENT (this "Third Amendment") dated as
of August 11, 1994 is entered into among USG CORPORATION (the
"Company"), USG INTERIORS, INC. ("Interiors") (the Company and
Interiors being sometimes collectively referred to herein as the
"Borrowers"), the FINANCIAL INSTITUTIONS LISTED ON THE SIGNATURE
PAGES HEREOF (collectively referred to herein, together with their
respective successors and assigns, as the "Senior Lenders" and
individually as a "Senior Lender"), BANKERS TRUST COMPANY,
CHEMICAL BANK and CITIBANK, N.A. ("Citibank"), in their capacities
as agents for the Senior Lenders hereunder (in such capacities,
the "Agents"), and CITIBANK, in its separate capacity as
administrative agent for the Senior Lenders hereunder (in such
capacity, the "Administrative Agent").  

          PRELIMINARY STATEMENTS.  (1)  The Borrowers, the Senior
Lenders, the Agents and the Administrative Agent have entered into
the Amended and Restated Credit Agreement dated as of May 6, 1993
(as amended pursuant to that certain First Amendment dated as of
August 1, 1993 (the "First Amendment") and that certain Second
Amendment dated as of January 31, 1994 (the "Second Amendment"),
the "Credit Agreement") and have agreed to further amend the
Credit Agreement as hereinafter set forth.

          (2)  Capitalized terms used herein and not otherwise
defined herein shall have the meanings ascribed to such terms in
the Credit Agreement.  Unless referring to a section of this Third
Amendment, all section references contained herein are references
to section numbers as they appear in the Credit Agreement.

          SECTION 1.  Amendments to the Credit Agreement.  Upon
the occurrence of the "Third Amendment Effective Date" (as defined
in Section 3 below), the Credit Agreement is amended as follows:

          1.1.  Amendments to Defined Terms.

          (a)  Section 1.01 of the Credit Agreement is hereby
amended as follows:

               (i)  The following defined term is inserted in
     Section 1.01 immediately following the defined term "Cash
     Equivalents":

                    "Cash Sweep Termination Date" shall have the
          meaning ascribed to such term in Section 2.06(b)(i).

               (ii)  The defined term "Excess Proceeds of Issuance
     of Stock or Debt" is amended to delete the parenthetical
     phrase in clause (ii) thereof and to substitute therefor the
     following:

          "(but excluding the net cash proceeds received by the
          Company on account of the incurrence of Indebtedness 
          (a) consisting of unsecured industrial development
          revenue bonds permitted under Section 8.01(xvii) hereof
          and (b) from and after the Revolving Loan Termination
          Date in accordance with the requirements set forth in
          Section 8.01(xii) hereof)"

               (iii)  The defined term "Investment" is amended to
     delete the word "other" immediately preceding the word
     "Person" in the fourth line thereof.

          (b)  Section 1.02 of the Credit Agreement is hereby
amended as follows:

               (i)  The term "Asbestos Adjustment" therein is
     deleted in its entirety.

               (ii)  The following is inserted in Section 1.02
     immediately following the term "Cash Available for Sweep": 
     "Cash Sweep Termination Date".

          1.2.  Amendments to Mandatory Prepayment of Cash
Available for Sweep.  Section 2.06(b)(i) of the Credit Agreement
is amended and restated in its entirety as follows (and the
applicable provisions of the First Amendment and the Second
Amendment, including, without limitation, Section 1.3(a) of the
First Amendment, are accordingly superseded):

               (i) Cash Available for Sweep.  (A) Within 30 days
     after the occurrence of the Test Date in each year (unless
     the Cash Sweep Termination Date has occurred on or before
     such Test Date), the Company shall prepare and deliver to the
     Administrative Agent a work sheet, substantially in the form
     of Exhibit 8-A, showing its calculation of Cash Available for
     Sweep as of such Test Date, together with a certificate,
     substantially in the form of Exhibit 8-B, signed by the chief
     accounting officer or chief financial officer of the Company,
     and certifying that such calculation is accurate and that
     neither the Company nor any Subsidiary of the Company has
     made any material prepayments (other than prepayments of
     trade payables, mandatory prepayments required under
     outstanding credit agreements or indentures, and, to the
     extent expressly permitted by the terms of this Agreement,
     prepayments of other Indebtedness) out of the ordinary course
     of business.  On the Sweep Payment Date in each year (unless
     the Cash Sweep Termination Date has occurred on or before the
     immediately preceding Test Date), the Company shall make or
     cause to be made a mandatory prepayment in an amount equal to
     the Cash Available for Sweep determined as of the immediately
     preceding Test Date, which prepayment shall be applied as
     follows:

               (1)  for any Sweep Payment Date occurring in 1995
          or 1996 for which the Sweep Percentage is greater than
          50%, such mandatory prepayment shall be applied:

                    (x)  first, up to $7,000,000 in the aggregate
               for all such Sweep Payment Dates, to Public Debt
               having maturities prior to January 1, 1999 and/or
               Term Loans as the Company shall elect in its
               discretion, provided, that:

                         (A) any portion of such $7,000,000 of
                    Cash Available for Sweep which is not used to
                    pay such Public Debt prior to the immediately
                    succeeding Test Date shall be applied by the
                    Company to the scheduled installments of the
                    Term Loans in the order of maturity; 

                         (B) if on any such Test Date, the Cash
                    Available for Sweep on such Test Date exceeds
                    the then outstanding principal balance of all
                    of the Public Debt having maturities prior to
                    January 1, 1999, such excess, up to $7,000,000
                    less the aggregate amount of Cash Available
                    for Sweep previously applied under this
                    Section 2.06(b)(i)(A)(1)(x), shall be applied
                    90% to the scheduled installments of the Term
                    Loans in the order of maturity on the Sweep
                    Payment Date immediately succeeding the
                    applicable Test Date and 10% to the Company as
                    Retained Amounts; and

                         (C) any Investment Premiums paid in
                    connection with the payment of such Public
                    Debt shall be subject to the limitations
                    described in Section 8.03(viii)(C); and

                    (y) second, following the application of the
               amounts described in item (x) above, 66-2/3% to the
               scheduled installments of the Term Loans in the
               order of maturity on the Sweep Payment Date
               immediately succeeding the applicable Test Date and
               33-1/3% to the Company as Retained Amounts, until
               such Retained Amounts (when added to the Retained
               Amounts described in item (x) above) equal
               $50,000,000 at which time 100% of such Cash
               Available for Sweep shall be applied to the
               scheduled installments of the Term Loans in the
               order of maturity on the Sweep Payment Date
               immediately succeeding the applicable Test Date;
               and

               (2)  for any Sweep Payment Date occurring in 1995
          or 1996 for which the Sweep Percentage is 50%, and for
          any Sweep Payment Date thereafter, such mandatory
          prepayment shall be applied (x) with respect to such
          Sweep Payment Dates in 1995 and 1996, in full to the
          scheduled installments of the Term Loans in the order of
          their maturity, and (y) with respect to such Sweep
          Payment Dates occurring in each subsequent year, one-
          third (1/3) to the scheduled installments of the Term
          Loans in the order of their maturity and two-thirds
          (2/3) to the scheduled installments of the Term Loans in
          the inverse order of their maturity.

                    (B) The following terms used in this Section
     2.06(b)(i) shall have the following meanings (such meanings
     to be applicable, except to the extent otherwise indicated in
     a definition of a particular term, both to the singular and
     the plural forms of the terms defined):

                    "Available Liquidity" means, with respect to
          any Test Date, (i) the daily average of all domestic
          Cash during the Test Period ending on such Test Date
          (excluding any Cash which constitutes Excess Proceeds of
          Issuance of Stock or Debt and any Cash proceeds of a
          revolving accounts receivable sale facility entered into
          by the Company and/or one or more of its Subsidiaries
          which has been consented to by the Senior Lenders), plus
          (ii) the daily average of all Cash of the Company's
          Foreign Subsidiaries in excess of the Minimum Foreign
          Cash Balances for such Foreign Subsidiaries during such
          Test Period (subject to the limitations set forth in
          Sections 2.6(b), 8.4 and 9.2 of the National Westminster
          Credit Agreement for so long as such Credit Agreement
          remains in effect), after subtracting (A) taxes which
          would have been incurred had such Cash been repatriated
          from such Foreign Subsidiaries, (B) minority interests
          in such Foreign Subsidiaries and (C) costs of applicable
          Foreign Exchange Contracts, plus (iii) the average daily
          amount during such Test Period by which $174,841,297
          exceeds the sum of (A) the outstanding principal balance
          of the Revolving Loans which constitute Working Capital
          Revolving Loans and (B) the Facility Letter of Credit
          Obligations.  The calculation described in clause (i)
          above shall be made assuming that all principal payments
          on Term Loans occurring during the Test Period were made
          on the date immediately preceding the first day of the
          Test Period.  The calculation described in clause (ii)
          above with respect to Foreign Subsidiaries other than
          Restricted Subsidiaries shall be the average of such
          excess Cash as of December 16th, December 31st and
          January 15th in each Test Period rather than a daily
          average.  In addition, Available Liquidity will be
          adjusted as a result of changes in working capital as
          described in Exhibit 9.

                    "Cash" means, with respect to any Person on
          any date, the amount which would be shown as "cash" on a
          balance sheet of such Person prepared in accordance with
          GAAP as of such date, plus all cash equivalents and
          readily marketable securities possessed by such Person.

                    "Cash Available for Sweep" means, with respect
          to each Test Date, an amount equal to the product of (i)
          the Sweep Percentage in effect on such Test Date, and
          (ii) the excess, if any, of the Available Liquidity for
          such Test Date over the Minimum Liquidity for such Test
          Date.

                    "Cash Sweep Termination Date" means the date
          on which the aggregate principal amount of outstanding
          Term Loans has been reduced to an amount less than
          $150,000,000.

                    "Foreign Exchange Contract" means, with
          respect to the Company and its Subsidiaries, any foreign
          currency exchange agreements entered into to hedge the
          amount of Cash held by the Company or any such
          Subsidiary. 

                    "Foreign Subsidiary" means a Subsidiary of the
          Company organized under the laws of a jurisdiction other
          than the United States or any political subdivision
          thereof.

                    "Minimum Foreign Cash Balance" means the
          following amounts for the following Foreign Subsidiaries
          (or groups of Foreign Subsidiaries), in each case plus
          the then outstanding aggregate balance of loans extended
          to the applicable Foreign Subsidiary (or group of
          Foreign Subsidiaries) pursuant to one or more revolving
          credit facilities in favor of such Foreign Subsidiary
          (or group of Foreign Subsidiaries), and minus the
          excess, if any, of (i) the cumulative actual Capital
          Expenditures made by the applicable Foreign Subsidiary
          (or group of Foreign Subsidiaries) during the period
          from January 1, 1993 to the end of the Fiscal Year
          immediately preceding the applicable Test Date over (ii)
          the Projected Foreign Capital Expenditures for such
          Foreign Subsidiary (or group of Foreign Subsidiaries) as
          of the end of the Fiscal Year immediately preceding the
          applicable Test Date; for purposes of the foregoing,
          amounts of foreign currencies shall be deemed to be
          exchanged into Dollars by using the applicable exchange
          rate quoted in the Wall Street Journal on the applicable
          Test Date:

          Subsidiary (or Group)         Minimum Cash Balance

          GTL                                $5,000,000
     
          CGC and Canadian
          Mining                            $10,000,000
     
          All other Foreign
          Subsidiaries                      $35,000,000

                    "Minimum Liquidity" for each Test Date, shall
          be (i) $100,000,000 for the Test Date in 1995 and
          $150,000,000 for each Test Date thereafter, plus (ii)
          the sum of the Retained Amounts for all prior Test
          Dates.

                    "National Westminster Credit Agreement" shall
          mean that certain Credit Agreement dated as of January
          29, 1990 among USG Netherlands B.V. and National
          Westminster Bank plc, as the same may be amended from
          time to time hereafter in accordance with the terms of
          Section 8.20 hereof.

                    "Projected Foreign Capital Expenditures"
          means, for the period from January 1, 1993 through the
          end of each Fiscal Year, the following amounts for the
          following Foreign Subsidiaries (or groups of Foreign
          Subsidiaries) for the indicated Fiscal Year:

                                CGC and Canadian   Other Foreign
      Fiscal Year       GTL         Mining          Subsidiaries
         1993         $0.1mm      $  8.0mm           $  9.0mm
         1994          0.2mm        16.5mm             23.0mm
         1995          0.3mm        25.5mm             33.0mm
         1996          0.4mm        34.5mm             43.0mm
         1997          0.5mm        44.0mm             60.0mm
         1998          0.6mm        53.5mm             76.5mm
         1999          0.7mm        63.0mm             93.0mm

                    "Retained Amount" means, for any Test Date, an
          amount equal to the sum of (i) the product of (a) 100%
          minus the Sweep Percentage for such Test Date and (b)
          the excess, if any, of the Available Liquidity for such
          Test Date over the Minimum Liquidity for such Test Date,
          plus (ii) any amounts designated as "Retained Amounts"
          in Section 2.06(b)(i)(A)(1) hereof.

                    "Sweep Payment Date" means each February 15th
          in each year, commencing with February 15, 1994.


                    "Sweep Percentage" means (i) 100% for the Test
          Dates occurring in 1995 and 1996, (ii) 90% for each of
          the Test Dates occurring in 1997 and 1998, and (iii) 85%
          for the Test Date occurring in 1999 and any subsequent
          Test Dates; provided, that the Sweep Percentage shall be
          50% for any Test Date for which the ratio of Debt to
          EBITDA (as such terms are defined in Section 9.01
          hereof, but without reference to Section 9.10 hereof) as
          of the immediately preceding December 31 was less than
          4.0 to 1.0.

                    "Test Date" means each January 15th in each
          year, commencing with January 15, 1994.

                    "Test Period" means, with respect to any Test
          Date, the period commencing on the immediately preceding
          December 16th and ending on such Test Date. 

          1.3.  Amendments to Mandatory Prepayment of Excess
Proceeds of Issuance of Stock or Debt.  Section 2.06(b)(ii) of the
Credit Agreement is amended and restated in its entirety as
follows (and the applicable provisions of the First Amendment and
the Second Amendment, including, without limitation, Section 5 of
the Second Amendment, are accordingly superseded):

               (ii)  Excess Proceeds of Issuance of Stock or Debt. 
     Within one (1) Business Day of the Company's receipt of any
     Excess Proceeds of Issuance of Stock or Debt (or, with
     respect to the Public Debt, within the time period set forth
     in Section 8.03(viii)(A)), the Company shall make or cause to
     be made a mandatory prepayment in an amount equal to a
     portion of such Excess Proceeds of Issuance of Stock or Debt,
     and shall otherwise be entitled to apply such Excess Proceeds
     of Issuance of Stock or Debt, as determined as follows:

               (A)  the Excess Proceeds of Issuance of Stock or
          Debt arising from the issuance of common stock by the
          Company pursuant to that certain S-1 Registration
          Statement filed with the Commission on January 7, 1994
          shall be applied to the following, as the Company may in
          its sole discretion elect:  (1) to the repayment of 10-
          1/4% Senior Notes in an aggregate principal amount not
          to exceed $70,000,000, (2) to Capital Expenditures
          permitted under Section 9.08(ix) hereof, and/or (3) in
          accordance with clause (B) below; provided, that all
          such amounts not so applied by March 16, 1995 shall
          cease to constitute Excess Proceeds of Issuance of Stock
          or Debt for all purposes hereunder (and therefore shall
          become subject to the calculation of Cash Available for
          Sweep, if applicable);

               (B)  except as applied pursuant to clauses (A)(1)
          or (2) above, prior to the payment in full of all Public
          Debt having maturity dates prior to January 1, 1999,
          100% of the Excess Proceeds of Issuance of Stock or Debt
          shall be applied to the repayment of Public Debt having
          maturity dates prior to January 1, 1999 and/or the
          outstanding Term Loans, as the Company may in its
          discretion elect; provided, that to the extent that any
          portion of such Excess Proceeds of Issuance of Stock or
          Debt are not so applied within the time period set forth
          in Section 8.03(viii)(A), then such portion shall cease
          to constitute Excess Proceeds of Issuance of Stock or
          Debt for all purposes hereunder (and therefore shall
          become subject to the calculation of Cash Available for
          Sweep, if applicable); and

               (C) following the payment in full of all Public
          Debt having maturity dates prior to January 1, 1999,
          100% of the Excess Proceeds of Issuance of Stock and
          Debt shall be applied to the outstanding principal
          balance of the Term Loans in the order of their
          maturity, but only until and to the extent that the
          aggregate outstanding principal balance of the Term
          Loans exceeds $150,000,000.

     The Company shall have no obligation to make any mandatory
     prepayment under this Section 2.06(b)(ii) once the aggregate
     outstanding principal balance of the Term Loans is less than
     or equal to $150,000,000.

          1.4.  Amendment to Indebtedness Covenant.  Section 8.01
of the Credit Agreement is hereby amended to add the following at
the end thereof:

               "(xvii)  Indebtedness of the Company or any
     Subsidiary consisting of unsecured industrial revenue bonds
     issued after the Effective Date which do not in the aggregate
     exceed $25,000,000."

          1.5.  Amendment to Sales of Assets Covenant.  Section
8.02(a)(v) of the Credit Agreement is hereby amended and restated
in its entirety as follows:

               "(v) any sale for cash by the Company or any of its
     Restricted Subsidiaries not described in clauses (i) through
     (iv) above, provided, that the Net Cash Proceeds of Sale
     received by the Company or any Restricted Subsidiary (x) from
     any such individual sale or related group of sales does not
     exceed Fifteen Million Dollars ($15,000,000) and (y) from all
     such sales in any Fiscal Year of the Company does not exceed
     an aggregate amount of Thirty Million Dollars ($30,000,000);
     and"

          1.6.  Amendments to Investments Covenant.  Section 8.03
of the Credit Agreement is hereby amended to delete clauses (viii)
through (x) thereof and to substitute therefor the following:

               "(viii)  Investments in Public Debt having final
     maturities prior to January 1, 2003, in order to effectuate
     the prepayment (or defeasance, subject to restrictions
     acceptable to the Agents) of such Public Debt, made with (A)
     Excess Proceeds of Issuance of Stock or Debt within one year
     following the receipt of such Excess Proceeds of Issuance of
     Stock or Debt (as described in Section 2.06(b)(ii)), (B) to
     the extent not used to make Capital Expenditures permitted
     hereunder, the amount of Net Cash Proceeds of Sale described
     in Section 9.08(iii) (referred to therein as "Excess Sale
     Proceeds"), (C) Cash Available for Sweep as described in
     Section 2.06(b)(i)(A)(1) hereof, provided, that, to the
     extent any such Investment under this clause (C) involves the
     payment of a premium in excess of 100% of the face amount of
     the applicable Public Debt (such excess being an "Investment
     Premium"), such Investment Premium shall be paid using
     Unrestricted Retained Amounts, except that up to an aggregate
     amount of $10,000,000 of Investment Premiums may be paid when
     no Unrestricted Retained Amounts exist at the time such
     Investment is made, (D) solely for Investments in Public Debt
     having final maturities in 1996 or 1997, proceeds from the
     borrowing of Public Debt Revolving Loans, and (E)
     Unrestricted Retained Amounts;

               (ix)  Investments, not otherwise described in
     clauses (i) through (viii) above, in 10-1/4% Senior Notes, in
     order to effectuate the prepayment (or defeasance, subject to
     restrictions acceptable to the Agents) thereof, not exceeding
     $30,000,000 in the aggregate amount at any one time
     outstanding; and

               (x)  any other Investments (other than Investments
     in Public Debt) not otherwise described in clauses (i)
     through (ix) above, not exceeding Forty Million Dollars
     ($40,000,000) in the aggregate at any one time outstanding;
     provided, that Investments in Public Debt under this clause
     (x) shall not at any one time exceed an aggregate amount of
     $5,000,000."

          1.7.  Amendment to Restricted Junior Payment Covenant. 
Section 8.05 of the Credit Agreement is hereby amended to add the
following at the end thereof:

               "(vii) the repurchase or redemption by CGC of its
     publicly-owned common stock, in an amount not to exceed 10%
     of its total outstanding shares of common stock in any single
     calendar year."

          1.8.  Amendment to Fundamental Changes Covenant. 
Section 8.07 of the Credit Agreement is hereby amended to delete
subsection (b) thereof in its entirety.

          1.9.  Amendment to Prepayment of Indebtedness Covenant. 
Section 8.16 of the Credit Agreement is hereby amended to delete
the parenthetical phrase in clause (y) thereof and to substitute
therefor the following:  

               "(except for the prepayment of the Indebtedness
     under the National Westminster Credit Agreement, or as
     otherwise expressly permitted pursuant to the terms of this
     Agreement, or as otherwise required pursuant to the terms of
     the agreements governing such long-term Indebtedness as in
     existence on and as of the Effective Date)"

          1.10.  Amendment to Capital Expenditures Covenant. 
Section 9.08 of the Credit Agreement is hereby amended to delete
clause (v) thereof and to substitute therefor the following:

               "(v) [Intentionally left blank];"

          SECTION 2.  Consent to Receivables Sale Facility.  The
Requisite Senior Lenders hereby consent to, and waive any conflict
with any provision set forth in Article VIII of the Credit
Agreement with respect to, a revolving accounts receivable sale
facility established by the Company pursuant to which the Company
and/or one or more of its Restricted Subsidiaries sells accounts
receivable and other related assets (or otherwise grants a lien
upon such accounts receivable or other related assets to secure
non-recourse debt); provided, that (i) such facility shall have a
maximum principal/investment amount not in excess of $150,000,000,
and shall otherwise be on terms and conditions reasonably
acceptable to the Agents, (ii) the first $60,000,000 of proceeds
from such facility may be applied by the Company to prepay or
repurchase 10-1/4% Senior Notes or for other permitted corporate
purposes, as the Company may in its discretion elect, (iii) unless
the original stated maturity of such facility (without giving
effect to any renewals thereof) is after December 31, 2000, the
Company shall, upon receipt thereof by the Company or any
Restricted Subsidiary, make a prepayment of the Term Loans, in the
order of maturity, in an amount equal to the lesser of (a)
$40,000,000 and (b) the aggregate proceeds received from such
facility in excess of $60,000,000, and (iv) except for the
prepayment of the 10-1/4% Senior Notes and/or the Term Loans as
described above, the use of the proceeds of such facility shall be
subject to the terms and provisions of Article VIII of the Credit
Agreement.  Notwithstanding anything in the Credit Agreement to
the contrary, the proceeds of such a revolving accounts receivable
sale facility shall not be Excess Proceeds of Issuance of Stock or
Debt subject to Section 2.06(b)(ii) thereof.

          SECTION 3.  Conditions Precedent to Effectiveness.  This
Third Amendment shall become effective as of the date (the "Third
Amendment Effective Date") on which each of the following
conditions precedent shall have occurred:

          (a)  Documentation.  The Agents shall have received all
of the following:

          (i)  Counterparts of this Third Amendment executed by
both of the Borrowers, the Agents, the Administrative Agent and
Senior Lenders whose Term Loans and Revolving Loan Commitments
aggregate 66-2/3% or more of the sum of the then aggregate unpaid
principal balance of the Term Loans and the then aggregate
principal amount of the Revolving Loan Commitments;

          (ii)  Reaffirmations of Guaranties executed by the
Company and each Subsidiary party to a Subsidiary Guaranty, in
form and substance reasonably satisfactory to the Agents and
counsel for the Agents;

          (iii)  The opinion of the General Counsel of the Company
and Interiors relating to such matters as the Agents deem
appropriate and in form and substance reasonably satisfactory to
the Agents and counsel for the Agents;

          (iv)  A certificate of the Secretary or Assistant
Secretary of the Company certifying (A) the names and true
signatures of the incumbent officers of the Company authorized to
sign this Third Amendment and all other Loan Documents executed by
the Company in connection herewith and (B) the resolutions of the
Company's Board of Directors approving and authorizing the
execution, delivery and performance of this Third Amendment and
all other Loan Documents executed by the Company in connection
herewith; and

          (v)  A certificate of the Secretary or Assistant
Secretary of Interiors certifying (A) the names and true
signatures of the incumbent officers of Interiors authorized to
sign this Third Amendment and all other Loan Documents executed by
Interiors in connection herewith and (B) the resolutions of
Interiors' Board of Directors approving and authorizing the
execution, delivery and performance of this Third Amendment and
all other Loan Documents executed by Interiors in connection
herewith.

          (b)  Prepayment of Cash Available for Sweep.  The
Company shall have paid $25,000,000 to the Administrative Agent,
for the account of the Term Senior Lenders, as a prepayment of the
Term Loans applied in the order of maturity.  To the extent that
the Company is required to pay any Cash Available for Sweep to the
Senior Lenders after the Third Amendment Effective Date, the
Company shall be entitled to offset the foregoing payment against
such required payments of Cash Available for Sweep (it being
understood that such calculations of Cash Available for Sweep
shall be made as if such prepayment had not been made and such
amounts remained as Cash held by USG).

          (c)  No Events of Default.  No Event of Default or
Potential Event of Default shall have occurred and be continuing.

          SECTION 4.  Confirmation of Credit Agreement.  Except as
herein expressly amended, the Credit Agreement is ratified and
confirmed in all respects and shall remain in full force and
effect in accordance with its terms.  Each reference in the Credit
Agreement to "this Agreement" shall mean the Credit Agreement as
amended by the First Amendment, as further amended by the Second
Amendment, as further amended by this Third Amendment, and as
hereinafter amended or restated.

          SECTION 5.  Costs and Expenses.  Each Borrower agrees to
pay on demand all costs and expenses of the Administrative Agent
and the Agents in connection with the preparation, reproduction,
execution and delivery of this Third Amendment, including the
reasonable fees and out-of-pocket expenses of Sidley & Austin,
counsel for the Agents.

          SECTION 6.  Successors and Assigns.  This Third
Amendment and the other Loan Documents executed in connection
herewith shall be binding upon the parties hereto and thereto and
their respective successors and assigns (including, without
limitation, a receiver, trustee or debtor-in-possession of any of
the Borrowers) and shall inure to the benefit of the parties
hereto and thereto and the successors and permitted assigns of the
Senior Lenders and the Issuing Banks.

          SECTION 7.  Execution in Counterparts.  This Third
Amendment may be executed and delivered in any number of
counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall
be deemed to be an original and all of which taken together shall
constitute one and the same original agreement.

          SECTION 8.  Governing Law.  This Third Amendment shall
be governed by and construed in accordance with the laws of the
State of New York.

          SECTION 9.  Headings.  Section headings in this Third
Amendment are included herein for convenience of reference only
and shall not constitute a part of this Third Amendment for any
other purpose.











           [Remainder of page intentionally left blank.]

          IN WITNESS WHEREOF, the parties hereto have caused this
Third Amendment to be executed by their respective officers
thereunto duly authorized as of the date first above written.

                              USG CORPORATION


                              By /s/ Richard H. Fleming
                                Title:


                              USG INTERIORS, INC.


                              By /s/ Richard H. Fleming
                                Title:

                              CITIBANK, N.A., 
                               as Administrative Agent, as an
                               Agent and as a Senior Lender


                              By /s/ Barbara A. Cohen         
                                Title:              

                              BANKERS TRUST COMPANY, as an
                               Agent and as a Senior Lender


                              By /s/ Mary Jo Jolly            
                                Title:              

                              CHEMICAL BANK, as an Agent
                               and as a Senior Lender


                              By /s/ Christopher C. Wardell   
                                Title: