FORM 11-K
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

(Mark One)
[X]  ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE ACT
     OF 1934
                  For the fiscal year ended September 30, 1999

                                       OR

[_]  TRANSITION REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE
     ACT OF 1934

               For the transition period from _______ to _________

                          Commission file number 1-2116


                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                            (Full title of the Plan)


                        ARMSTRONG WORLD INDUSTRIES, INC.
               2500 Columbia Avenue Lancaster, Pennsylvania 17604
           (Name of issuer of the securities held pursuant to the Plan
               and the address of its principal executive office)


                                       1




                                                                        Page No.
                                                                        --------

                                                                     
Item 1. Independent Auditors' Report                                           4
        ----------------------------

Item 2. Statements of Net Assets Available for Benefits                        5
        -----------------------------------------------
         September 30, 1999 and 1998

Item 3. Statements of Changes in Net Assets Available for Benefits             6
        ----------------------------------------------------------
         Years ended September 30, 1999 and 1998

Notes to Financial Statements                                               7-14

Schedule of Net Assets Held for Investment Purposes                           15


Exhibits                                                                      16
- --------
         Consent of Independent Auditors



                                       2


                                    SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the members
of the committee constituting the administrator which administers the plan have
duly caused this annual report to be signed by the undersigned hereunto duly
authorized.

                      RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                      OF ARMSTRONG WORLD INDUSTRIES, INC.


April 11, 2000        By: /s/ Douglas L. Boles
                      -------------------------

                      Douglas L. Boles Vice-Chairman of the Retirement Committee


                                       3


                          Independent Auditors' Report
                          ----------------------------


The Retirement Committee
Armstrong World Industries, Inc.:

We have audited the accompanying statements of net assets available for benefits
of the Retirement Savings and Stock Ownership Plan of Armstrong World
Industries, Inc. as of September 30, 1999 and 1998 and the related statements of
changes in net assets available for benefits for each of the years in the
two-year period ended September 30, 1999. These financial statements are the
responsibility of the plan's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for benefits of the Retirement
Savings and Stock Ownership Plan of Armstrong World Industries, Inc. as of
September 30, 1999 and 1998 and the changes in net assets available for benefits
for each of the years in the two-year period ended September 30, 1999, in
conformity with generally accepted accounting principles.

Our audits were performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of assets held
for investment purposes as of September 30, 1999 is presented for the purpose of
additional analysis and is not a required part of the basic financial statements
but is supplementary information required by the Department of Labor's Rules and
Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974. This supplemental schedule is the responsibility of the
plan's management. The supplemental schedule has been subjected to the auditing
procedures applied in the audit of the basic financial statements and, in our
opinion, is fairly stated in all material respects in relation to the basic
financial statements taken as a whole.


April 10, 2000
Philadelphia, Pennsylvania


                                       4


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                 Statement of Net Assets Available for Benefits
                           September 30, 1999 and 1998



                                                                                    September 30,
                                                                                    -------------
                                                                            1999                    1998
                                                                            ----                    ----
                                                                                            
Assets:
   Investments in master trust, at fair value (note 3):
     Cash equivalents:
        Fidelity Retirement Money Market Portfolio                        $6,260,193              $6,694,202
     Shares of registered investment companies:
        Fidelity Magellan Fund                                            94,279,257              70,514,675
        Fidelity Low-Priced Stock Fund                                     1,104,042                 974,094
        Fidelity OTC Portfolio                                            16,888,380              10,301,519
        Fidelity Asset Manager Fund                                        6,575,650               5,863,649
        Fidelity Asset Manager:  Income Fund                               2,745,807               3,062,879
        Fidelity Asset Manager:  Growth Fund                               9,872,050               9,250,957
        Fidelity Overseas Fund                                               687,156                 342,931
        MAS Value Portfolio                                                  552,455                 494,143
        MAS Mid Cap Value Portfolio                                        2,603,629               1,979,431
        Spartan US Equity Index Fund                                      66,781,827              54,298,768
        Morgan Stanley Global Equity Portfolio                             1,389,484               1,030,265
    Fixed income insurance contracts:
        Fidelity Interest Income Fund                                    130,734,847             133,791,698
    Armstrong Common Stock                                                 9,389,002              10,340,697
    Participant loans                                                      4,536,463               5,025,880
                                                                           ---------               ---------
                                                                         354,400,242             313,965,788
  Investments in employee stock ownership funds, at fair value:
    Cash equivalents                                                       1,329,085               1,497,589
    Allocated Armstrong Common Stock                                      91,378,814              97,351,544
    Unallocated Armstrong Common Stock                                   114,301,110             155,048,402
                                                                         -----------             -----------
                                                                         207,009,009             253,897,535

    Employer contributions receivable                                      3,397,035               3,766,886
    Interest receivable                                                        5,558                   6,718
                                                                               -----                   -----

            Total assets                                                 564,811,844             571,636,927
                                                                         -----------             -----------

Liabilities:
  Guaranteed ESOP notes (note 6)                                         167,435,150             190,538,204
  Loans due to plan sponsor (note 7)                                      20,551,404              14,971,603
  Accrued interest                                                         4,302,958               4,851,306
                                                                           ---------               ---------

            Total liabilities                                            192,289,512             210,361,113
                                                                         -----------             -----------

    Net assets available for benefits                                   $372,522,332            $361,275,814
                                                                        ============            ============


The accompanying notes are an integral part of these financial statements.

                                       5


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
            Statement of Changes in Net Assets Available for Benefits
                     Years Ended September 30, 1999 and 1998




                                                                         Year Ended September 30,
                                                                         ------------------------
                                                                         1999                 1998
                                                                         ----                 ----
                                                                                     
Additions to net assets attributed to:
     Employee contributions                                           $19,773,862          $21,795,403
     Employer contributions  (note 4)                                  15,005,805           11,562,987
                                                                       ----------           ----------
                                                                       34,779,667           33,358,390

     Dividends                                                         22,884,904           18,713,201
     Interest                                                           8,241,647            8,792,964
     Realized gain on investments (note 3)                              8,347,716            6,122,768
                                                                        ---------            ---------
                                                                       39,474,267           33,628,933
                                                                       ----------           ----------

           Total additions                                             74,253,934           66,987,323
                                                                       ----------           ----------

Reduction in net assets attributed to:
     Benefits paid to participants                                   (33,877,602)         (24,655,993)
     Interest expense                                                (15,531,463)         (17,398,000)
     Unrealized depreciation of investments                          (13,288,300)         (71,131,768)
     Transfers to other employee benefit plans                          (310,051)            (531,442)
                                                                        ---------            ---------

           Total reductions                                          (63,007,416)        (113,717,203)
                                                                     ------------        -------------

     Net increase (decrease)                                           11,246,518         (46,729,880)

Net assets available for benefits:
     Beginning of year                                                361,275,814          408,005,694
                                                                      -----------          -----------

     End of year                                                     $372,522,332         $361,275,814
                                                                     ============         ============


The accompanying notes are an integral part of these financial statements.

                                       6


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                          Notes to Financial Statements

(1)  Summary of Significant Accounting Policies
     ------------------------------------------

     (a)  Basis of Presentation
          ---------------------

          The accompanying financial statements have been prepared on the
          accrual basis.

          The preparation of financial statements in conformity with generally
          accepted accounting principles requires management to make estimates
          and assumptions that affect the reported amounts of assets and
          liabilities and disclosure of contingent assets and liabilities at the
          date of the financial statements and the reported amounts of revenues
          and expenses during the reporting period. Actual results could differ
          from estimates recorded.

          The financial statements have been prepared in accordance with
          Statement of Position 99-3, "Accounting for and Reporting of Certain
          Defined Contribution Plan Investments and Other Disclosure Matters"
          (SOP 99-3). This standard eliminates the requirement to disclose
          amounts relating to individual participant-directed investment
          programs. As required by SOP 99-3, prior year amounts have been
          reclassified to conform with the current year presentation.

     (b)  Investments in Master Trust
          ---------------------------

          The money market portfolio is stated at cost, which approximates fair
          value. The interest income fund is comprised of guaranteed interest
          rate contracts within the Master Trust which are fully benefit
          responsive; and therefore are reflected at contract value plus
          credited interest in the financial statements. The value of the
          participant loans represents the unpaid principal of employee loans.
          The value of all other investments is based on quoted market price.

          Securities transactions are recognized on the settlement date (the
          date on which payment for a buy or sell order is made or received),
          since adjustment to a trade-date basis would not be material. Dividend
          income is recorded on the ex-dividend date.

          Realized gains and losses on investments are determined by the average
          cost method.

          Employee Stock Ownership Funds
          ------------------------------
          Investments in the Employee Stock Ownership Funds represent shares of
          Armstrong common stock valued at quoted market price.

     (c)  Expenses
          --------
          All legal, accounting and administrative expenses associated with Plan
          operations are paid by Armstrong World Industries, Inc. ("Armstrong")

(2)  Plan Description
     ----------------
     The Retirement Savings and Stock Ownership Plan of Armstrong World
     Industries, Inc. ("the Plan") is a defined-contribution plan established
     for the purpose of providing participants a means for long-term savings
     intended for the accumulation of retirement income in addition to that
     provided under other retirement plans maintained for the benefit of
     employees. The Plan is comprised of two parts--Retirement Savings Plan and
     Employee Stock Ownership Plan (ESOP). Each part has its own set of
     participant accounts and investment funds.


                                       7


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

     (a)  Retirement Savings
          ------------------

          Separate balances are maintained for contributions made by or on
          behalf of a participant. The balances in each fund reflect the
          participants' contributions together with dividends, interest, other
          income, and realized and unrealized gains and losses allocated
          thereon.

          Each participant may have up to five accounts that make up the
          participant's total balance:

               Sheltered account - Participants may contribute from 1% to 15% of
               -----------------
               before-tax compensation as deferred compensation, as permitted
               under Section 401(k) of the Internal Revenue Code.

               Standard account - Participants may contribute from 1% to 10% of
               ----------------
               after-tax compensation.

               Rollover account - Participants may invest any untaxed amounts
               ----------------
               rolled over from another tax-qualified, employer-sponsored plan.

               Tax-deductible account (MIRA) - This account holds any
               -----------------------------
               contributions made to the Plan before January 1, 1987. No new
               contributions can be made to this account.

               Old Match account - This account holds any amount contributed by
               -----------------
               Armstrong before matching contributions were discontinued. No new
               contributions are being made to this account.

          Participants have an immediate 100 percent vested interest with
          respect to their contributions and are fully vested with regard to any
          previously made matching Armstrong contributions.

     (b)  Stock Ownership
          ---------------
          The Stock Ownership portion of the Plan has three accounts maintained
          for each member for contributions and allocations of shares of
          Armstrong common stock from the Unallocated Armstrong Common Stock
          Fund.

          Participants who elect to reduce their before-tax compensation in
          amounts ranging from one percent to six percent have these
          contributions credited to an Exchange Account. Contributions to the
          Exchange Account are invested in Armstrong common stock. The Plan
          matches a portion of the contributions made to the Exchange Account
          with additional shares of Armstrong common stock. The matching amounts
          are recorded in participants' Match Accounts. The match percentage,
          either 50% or 75%, is determined by the closing stock price on the
          last day of the allocation period. For the allocation period ended in
          December 1997, a 75% fixed match was in place on employee Exchange
          Account contributions. For the allocation periods ended in June 1998,
          December 1998 and June 1999 there was a 50% fixed match on employee
          Exchange Account contributions.

          Eligible participants also receive shares of Armstrong common stock in
          their Equity Account. The Equity Account is intended to provide a
          source of funds to replace certain retiree medical benefits which were
          phased out in conjunction with the adoption of the ESOP.

          Participants have an immediate 100 percent vested interest in the full
          value of their Exchange Account. Interest in the Equity and Match
          Accounts vest after five years of service.

                                       8


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

(3)  Investments in Master Trust
     ---------------------------

     (a)  Retirement Savings Funds
          ------------------------

          Assets are held in a Master Trust administered by Fidelity Management
          Trust Co., as Trustee, and are segregated into fourteen investment
          options. The Plan utilizes the Trustee and associated investment
          managers to direct investment activity. The Plan participates in
          fourteen investment alternatives.

          The following is a brief description of the investment funds to which
          Plan participants may elect to allocate their contributions.
          Participants should refer to fund prospectuses for more complete
          information regarding the investment funds.

          1.   Spartan US Equity Index Fund - This fund is principally a
               portfolio of common stocks constructed and maintained with the
               objective of providing investment results which approximate the
               overall performance of the common stocks included in the Standard
               & Poor's Composite Index of 500 stocks.

          2.   Fidelity Magellan Fund - This fund invests in common stocks of
               companies having substantial growth prospects as determined by
               independent investment managers.

          3.   Fidelity Low-Priced Stock Fund - This fund seeks capital
               appreciation through investments primarily in U.S. and foreign
               low-priced stocks that may be undervalued, overlooked or out of
               favor.

          4.   Fidelity Retirement Money Market Portfolio - This fund invests in
               short-term (less than one year maturity) fixed income instruments
               such as U.S. Treasury Bills, bank certificates of deposit, and
               high grade commercial paper.

          5.   Fidelity Interest Income Fund - Contributions to this fund are
               invested in the general accounts of insurance companies and are
               credited at contracted interest rates. Invested principal and
               accumulated interest amounts are guaranteed against loss by the
               insurance company. Crediting interest rates are reset
               periodically during the plan year. At September 30, 1999, the
               interest rates ranged between 4.73% and 7.88%. At September 30,
               1998, the interest rates ranged between 5.45% and 8.26%. The
               average yields for the plan years ended September 30, 1999 and
               September 30, 1998, were 5.91% and 6.22%, respectively. The fair
               value of the contracts approximate cost.

          6.   Morgan Stanley Global Equity Portfolio - This fund invests in a
               diversified selection of stocks throughout the world, after a
               detailed analysis by local country investment experts. It seeks
               to increase the value of the investment over the long term
               through growth of capital.

          7.   Armstrong Common Stock - Amounts invested in this fund, along
               with dividend earnings thereon, are invested in Armstrong common
               stock. Common stock shares held by the fund at September 30, 1999
               and 1998 were 208,932 and 193,284, respectively.

          8.   Fidelity Overseas Fund - This fund invests in securities of
               issuers whose principal business activities are outside the U.S.
               Investments may include common stock and securities convertible
               into common stock, as well as debt instruments.

                                       9


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

          9.   Fidelity OTC Portfolio - This fund invests in securities traded
               in the over-the-counter securities market with the objective of
               maximizing capital appreciation. Over-the-counter securities
               include common and preferred stocks, securities convertible into
               common stock, warrants, and debt instruments.

          10.  Fidelity Asset Manager Fund - This is an asset allocation fund
               which invests in a portfolio of stocks, bonds, and short-term
               instruments. The fund has a balanced investment strategy with a
               goal of high total return with reduced risk over the long term.

          11.  Fidelity Asset Manager: Income Fund - This is an asset allocation
               fund which invests in a diversified portfolio of stocks, bonds,
               and short-term instruments. The fund has an investment strategy
               focusing on bonds and short-term instruments to achieve a high
               level of current income and capital preservation.

          12.  Fidelity Asset Manager: Growth Fund - This is an asset allocation
               fund invested in a diversified mix of stocks, bonds, and
               short-term instruments. The fund's investment strategy is an
               aggressive one emphasizing stocks with the goal of maximum total
               return over the long term.

          13.  MAS Mid Cap Value Portfolio - This fund invests in undervalued
               common stocks of mid-sized companies with a strong potential for
               increase in share price. It seeks to provide above-average
               long-term returns.

          14.  MAS Value Portfolio - This fund seeks to provide above average
               long-term returns by investing mostly in common stocks of large
               companies that are considered undervalued.

          Participant loans represent the unpaid principal balances of loans
          made by Plan participants in accordance with established loan
          provision guidelines.

     The following table presents the cost and estimated fair values of the
     investments in securities of the Master Trust at September 30, 1999 and
     1998:



                                                          September 30, 1999                     September 30, 1998
                                                          ------------------                     ------------------
                      Investment                              Cost       Fair Value              Cost      Fair Value
                      ----------                              ----       ----------              ----      ----------
                                                                                              
     Spartan US Equity Index Fund                      $33,366,637      $66,781,827       $30,965,142     $54,298,768
     Fidelity Magellan Fund                             63,218,189       94,279,257        53,733,116      70,514,675
     Fidelity Low-Priced Stock Fund                      1,277,167        1,104,042         1,226,454         974,094
     Fidelity Retirement Money Market Portfolio          6,260,193        6,260,193         6,694,202       6,694,202
     Fidelity Interest Income Fund                     130,734,847      130,734,847       133,791,698     133,791,698
     Morgan Stanley Global Equity Portfolio              1,461,196        1,389,484         1,216,654       1,030,265
     Armstrong Common Stock                              9,432,051        9,389,002         8,381,834      10,340,697
     Fidelity Overseas Fund                                621,668          687,156           410,197         342,931
     Fidelity OTC Portfolio                             12,650,977       16,888,380         9,668,586      10,301,519
     Fidelity Asset Manager Fund                         6,419,335        6,575,650         5,385,573       5,863,649
     Fidelity Asset Manager: Income Fund                 2,694,986        2,745,807         2,936,801       3,062,879
     Fidelity Asset Manager: Growth Fund                 8,723,512        9,872,050         8,057,265       9,250,957
     MAS Mid Cap Value Portfolio                         2,528,421        2,603,629         2,349,006       1,979,431
     MAS Value Portfolio                                   713,422          552,455           633,442         494,143
     Participant loans                                   4,536,463        4,536,463         5,025,880       5,025,880
                                                         ---------        ---------         ---------       ---------
                                                      $284,639,064     $354,400,242      $270,475,850    $313,965,788
                                                      ============     ============      ============    ============


                                      10


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

     The amounts of realized gain (loss) on investments in securities of the
     Master Trust for the years ended September 30, 1999 and 1998 are presented
     below:



                                                       Aggregate           Aggregate            Realized
                         1999                           Proceeds              Cost             Gain (Loss)
                         ----                           --------              ----             -----------
                                                                                           
     Spartan US Equity Index Fund                          $9,073,848          $5,088,537           $3,985,311
     Fidelity Magellan Fund                                10,302,447           7,012,404            3,290,043
     Fidelity Low-Priced Stock Fund                           216,502             251,067             (34,565)
     Morgan Stanley Global Equity Portfolio                   303,663             318,334             (14,671)
     Armstrong Common Stock                                 1,929,159           1,549,559              379,600
     Fidelity Overseas Fund                                   101,370              99,668                1,702
     Fidelity OTC Portfolio                                 1,951,437           1,645,180              306,257
     Fidelity Asset Manager Fund                            1,355,569           1,304,187               51,382
     Fidelity Asset Manager: Income Fund                      775,716             776,098                (382)
     Fidelity Asset Manager: Growth Fund                    2,330,060           2,061,562              268,498
     MAS Mid Cap Value Portfolio                              720,145             761,593             (41,448)
     MAS Value Portfolio                                      257,353             295,579             (38,226)
                                                              -------             -------             --------
                                                          $29,317,269         $21,163,768           $8,153,501
                                                          ===========         ===========           ==========



                                                       Aggregate           Aggregate            Realized
                         1998                           Proceeds              Cost             Gain (Loss)
                         ----                           --------              ----             -----------
                                                                                      
     Spartan US Equity Index Fund                          $6,375,852          $4,027,792           $2,348,060
     Fidelity Magellan Fund                                 8,249,869           6,150,026            2,099,843
     Fidelity Low-Priced Stock Fund                            79,015              83,741              (4,726)
     Morgan Stanley Global Equity Portfolio                   116,139             123,406              (7,267)
     Armstrong Common Stock                                 2,084,876           1,188,574              896,302
     Fidelity Overseas Fund                                    40,318              40,748                (430)
     Fidelity OTC Portfolio                                 3,285,757           2,856,529              429,228
     Fidelity Asset Manager Fund                            1,459,750           1,298,412              161,338
     Fidelity Asset Manager: Income Fund                      726,059             705,660               20,399
     Fidelity Asset Manager: Growth Fund                    1,965,174           1,710,580              254,594
     MAS Mid Cap Value Portfolio                              192,264             201,573              (9,309)
     MAS Value Portfolio                                       55,756              58,416              (2,660)
                                                               ------              ------              -------
                                                          $24,630,829         $18,445,457           $6,185,372
                                                          ===========         ===========           ==========



(b)  Stock Ownership Funds
     ---------------------
     According to the terms of the trust agreement between Mellon Bank, N.A.,
     ("the Trustee"), and Armstrong World Industries, Inc., the Trustee manages
     a trust fund that has been created under the Plan and has been granted
     authority to purchase and sell Armstrong common stock as is necessary to
     administer the Plan in accordance with its terms.

     At September 30, 1999, the investment in Armstrong common stock represents
     4,576,971 shares, valued at a quoted market price of $44.938. There are
     2,033,442 shares held in the Allocated Armstrong Stock Fund and 2,543,529
     shares held in the Unallocated Armstrong Stock Fund. During 1999, aggregate
     proceeds were $8,337,648, aggregate costs were $8,143,433, and the realized
     gain was $194,215. Losses of $62,604 were realized during 1998.

                                      11


                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

(4)  Armstrong Contributions
     -----------------------
     Armstrong is obligated to make semi-annual contributions in cash or
     Armstrong stock to the Stock Ownership Funds, on June 15 and December 15 of
     each year, which when aggregated with all exchange contributions, dividends
     received by the Trustee on the common stock held by the Trust, and trust
     earnings, is at least equal to the amount necessary to enable the Trustee
     to pay currently maturing obligations under the Guaranteed ESOP notes.
     (Note 6) The contribution from Armstrong on December 15, 1999 included
     199,053 shares of Armstrong common stock contributed directly to allocated
     accounts.

(5)  Employee ESOP Contributions and Dividends
     -----------------------------------------
     Employee ESOP contributions made during the year and dividends paid on
     Allocated Armstrong Stock are initially deposited into the Fidelity
     Retirement Money Market Portfolio until the next semi-annual allocation
     date, at which time they are contributed to the ESOP. During the time in
     the Fidelity Retirement Money Market Portfolio, these funds earn interest.
     At September 30, 1999 and 1998, the amounts in the Fidelity Retirement
     Money Market Portfolio to be contributed to the ESOP were $3,609,424 and
     $3,530,318, respectively.

(6)  Guaranteed ESOP Notes
     ---------------------
     The shares of Armstrong common stock held in the Plan's Stock Ownership
     Accounts were purchased from Armstrong from the proceeds of the sale of
     Guaranteed ESOP notes in a total principal amount of $270,000,000 in 1989.
     Armstrong has guaranteed the payment of principal and interest on the
     notes.

     The notes must be repaid in semi-annual installments with interest per
     annum at 8.35% on the Series A Guaranteed Serial ESOP Notes due 1989-2001
     and 8.92% on the Series B Guaranteed Serial ESOP notes due 2001-2004. At
     September 30, 1999, the Guaranteed ESOP notes for Series A and Series B
     were $47,392,150 and $120,043,000, respectively. At September 30, 1998, the
     Guaranteed ESOP notes for Series A and Series B were $70,495,204 and
     $120,043,000, respectively. The scheduled amortization of the notes for the
     next five plan years is as follows: 2000 - $25,277,000; 2001 - $22,115,150;
     2002 - $34,442,000; 2003 - $39,816,000; 2004 - $45,785,000.

(7)  Loans Due Plan Sponsor
     ----------------------
     A refinancing loan from Armstrong is used to ensure that the number of
     shares allocated during a semi-annual allocation period is equal to the sum
     of participants' exchange, equity and match shares. At September 30, 1999,
     there were nine loans outstanding totaling $20,551,404.


                                      12


                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

(8)  Benefits
     --------
     (a)  Retirement Savings Accounts
          ---------------------------
          Under terms of the Plan, a participant (or a beneficiary) is eligible
          for benefits upon retirement, termination of employment, or death
          before retirement. Disbursement of the total amount credited to a
          participant's account is payable (i) in a lump sum or (ii) in the case
          of retirement, in such other manner as requested by the participant
          and approved by the Plan Administrator.

          In addition, an active employee may elect to withdraw all or any part
          of his account attributable to after-tax contributions. Before
          reaching age 59 1/2, an active employee may withdraw his pretax
          contributions from the Sheltered Account, provided he can demonstrate
          financial hardship. Such employee shall be ineligible to make
          contributions for a 12-month period. An active employee may elect to
          withdraw all or any portion of his account balance in the
          Tax-Deductible (MIRA) and Rollover Accounts.

          Under the rules of the Plan, the participant may borrow up to the
          lessor of 50% of his balance or $50,000. The money borrowed must come
          from the Sheltered, Rollover, and Standard Accounts. The amount of the
          loan is transferred to a Loan Reserve pledged as security for the loan
          and is evidenced by a promissory note payable to the Plan. Interest
          rates are determined periodically by the Retirement Committee in
          accordance with prevailing interest rates. The loans are reflected in
          the Loan Portfolio investment fund. Loan repayments are made by
          payroll deductions or in a manner agreed to by the employee and the
          Plan Administrator.

     (b)  Stock Ownership Accounts
          ------------------------
          Upon death or any other separation from service from Armstrong,
          participants are entitled to receive a distribution of their vested
          account balances. Distributions are in the form of a lump sum cash
          payment or, upon request, Armstrong common stock.

(9)  Obligation for Benefits
     -----------------------
     All the funds of the Plan are held by investing institutions appointed by
     Armstrong under a trust agreement or investment contract. Benefits under
     the Plan are payable only out of these funds. Armstrong has no legal
     obligation to make any direct payment of benefits accrued under the Plan.

     Except as may be provided in an investment contract, neither Armstrong nor
     any investing institution guarantees the funds of the Plan against any loss
     or depreciation or guarantees the payment of any benefit thereunder.
     Although Armstrong has not expressed any intent to terminate the Plan, it
     may do so at any time. In case of termination or partial termination, the
     total amount in each employee's account will be distributed as the Plan
     Administrator directs.

(10) Eligibility
     -----------
     All regular full-time employees of Armstrong or of any participating
     affiliated Armstrong are eligible to participate in the Plan except for
     foreign nationals, leased employees, and those employees in a collective
     bargaining unit unless the collective bargaining agent for that unit agrees
     to coverage under the Plan.

     Eligible participants, who leave Armstrong and are later reemployed, can
     resume participation in the Plan on the date of rehire.

(11) Diversification
     ---------------
     Effective January 1, 1997, Plan participants who meet certain age and
     service requirements were granted the ability to diversify specified
     portions of their Stock Ownership Account balances in any combination of
     the other investment funds available for Retirement Savings Account
     balances, except for the Fidelity Retirement Money Market Portfolio.


                                      13


                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
                   Notes to Financial Statements, (Continued)

(12) Federal Income Taxes
     --------------------
     By a letter dated April 21, 1998, the Internal Revenue Service has
     determined and informed the Armstrong that the Plan qualifies under the
     applicable provisions of the Internal Revenue Code and is therefore exempt
     from federal income taxes.

(13) Master Trust Agreement
     ----------------------
     Effective October 1, 1990, the Plan established a Master Trust Agreement
     with Fidelity Management Trust Company. Under the Master Trust Agreement,
     the Plan assets held by Fidelity Management Trust Company are commingled
     and invested with the assets of the Retirement Savings and Stock Ownership
     Plan of Armstrong World Industries, Inc. and the Bonus Retirement Plan of
     Armstrong World Industries, Inc. Separate accounting for each plan under
     the Master Trust Agreement is provided by Fidelity Management Trust
     Company. The Plan has an undivided interest in the assets of this trust,
     and ownership is represented by proportionate dollar interest. The
     following summarizes the financial information of the Master Trust at
     September 30, 1999 and 1998:



                                                      September 30, 1999                    September 30, 1998
                                                  Cost              Fair Value          Cost              Fair Value
                                                  ----              ----------          ----              ----------
                                                                                               
   Cash equivalents                               $6,970,356        $6,970,356          $7,277,128        $7,277,128
   Armstrong Common Stock                         17,025,328        16,773,013          15,494,806        18,779,265
   Registered investment companies               158,703,416       239,082,835         137,463,217       184,878,481
   Fixed income insurance contracts              178,879,174       178,879,174         180,069,533       180,069,533
   Participant loans                               6,635,754         6,635,754           7,298,722         7,298,722
                                                   ---------         ---------           ---------         ---------
        Total investments in Master Trust       $368,214,028      $448,341,132        $347,603,406      $398,303,129
                                                ============      ============        ============      ============

   Plan's interest in Master Trust              $284,639,064      $354,400,242        $270,475,850      $313,965,788
   Plan's percentage in Master  Trust                  77.3%             79.0%               77.8%             78.8%


During 1999 and 1998, the Master Trust's investments (including investments
bought, sold, and held during the year) appreciated in value as follows:



                                                                    1999                   1998
                                                                    ----                   ----
                                                                             
Net appreciation in Master Trust                             $39,306,600           $(6,524,510)
Allocated net appreciation in Master Trust                   $34,424,744           $(4,044,835)


During 1999 and 1998, interest and dividends were as follows:


                                                                    1999                   1998
                                                                    ----                   ----
                                                                              
Interest and dividends in Master Trust                       $27,520,873            $23,337,613
Allocated interest and dividends from
investment in Master Trust                                   $21,954,068            $18,427,493



All of the above information was certified as complete and accurate by the
trustee at September 30, 1999 and 1998 and for the years then ended.


                                      14


                 THE RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                       OF ARMSTRONG WORLD INDUSTRIES, INC.
           Line 27A - Schedule of Assets Held for Investment Purposes
                               September 30, 1999


Description of Investment                         Cost              Fair Value
- --------------------------------------------------------------------------------
Unallocated Armstrong Common Stock            $121,453,510          $114,301,110

Allocated Armstrong Common Stock               $95,539,681           $91,378,814

Investments in Master Trust                   $284,639,064          $354,400,242


                                      15