[CONFORMED COPY]



                      AMENDMENT NO. 1 TO CREDIT AGREEMENT


          AMENDMENT dated as of April 9, 1996 among ARMSTRONG WORLD INDUSTRIES,
INC. (the "Borrower"), the BANKS listed on the signature pages hereof (the
"Banks") and MORGAN GUARANTY TRUST COMPANY OF NEW YORK, as Agent (the "Agent").


                             W I T N E S S E T H :


          WHEREAS, the parties hereto have heretofore entered into a Credit
Agreement dated as of February 7, 1995 (the "Agreement"); and

          WHEREAS, the parties hereto desire to amend the Agreement to modify
the rates of interest payable thereunder, to extend the term thereof, to add the
New Banks (as defined below) as parties to the Agreement as amended hereby and
to provide for changes in the total and respective Commitments of the Banks;

          NOW, THEREFORE, the parties hereto agree as follows:

          SECTION 1.  Definitions; References.  Unless otherwise specifically
                      -----------------------                                
defined herein, each term used herein which is defined in the Agreement shall
have the meaning assigned to such term in the Agreement.  Each reference to
"hereof", "hereunder", "herein" and "hereby" and each other similar reference
and each reference to "this Agreement" and each other similar reference
contained in the Agreement shall from and after the date hereof refer to the
Agreement as amended hereby.  The term "Notes" defined in the Agreement shall
include from and after the date hereof the New Notes (as defined below).

          SECTION 2.  Amendment of Section 1.01 of the Agreement.  (a) Each of
                      ------------------------------------------              
the following definitions in Section 1.01 of the Agreement are amended to read
in full as follows:

          "Pricing Schedule" means the Schedule attached to Amendment No. 1 to
          the Credit Agreement identified as such.

 
          "Termination Date" means April 9, 2001, or if such day is not a Euro-
          Dollar Business Day, the next preceding Euro-Dollar Business Day.

          (b) The definition of "Consolidated Net Worth" is amended by replacing
the amount "$50,000,000" with "$100,000,000" and by replacing the words "write
offs" with the words "special charges."

          SECTION 3.  Amendment of Section 5.07 of the Agreement.  Section 5.07
                      ------------------------------------------               
is amended by replacing the amount "$470,000,000" with "$500,000,000."

 
          SECTION 4.  Amendment of Section 9.07(a) of the Agreement.  Section
                      ---------------------------------------------          
9.07(a) is amended by replacing the amount "$300,000,000" with "$500,000,000."

          SECTION 5.  New Banks; Changes in Commitments.  With effect from and
                      ---------------------------------                       
including the date this Amendment becomes effective in accordance with Section 8
hereof, (i) each Person listed on the signature pages hereof which is not a
party to the Agreement (a "New Bank") shall become a Bank party to the Agreement
and (ii) the Commitment of each Bank shall be the amount set forth opposite the
name of such Bank on the signature pages hereof, as such amount may be reduced
from time to time pursuant to Section 2.09 of the Agreement.  Any Bank whose
Commitment is changed to zero shall upon such effectiveness cease to be a Bank
party to the Agreement, and all accrued fees and other amounts payable under the
Agreement for the account of such Bank shall be due and payable on such date;
provided that the provisions of Section 9.03 of the Agreement shall continue to
inure to the benefit of each such Bank.

          SECTION 6.  Representations and Warranties.  The Borrower hereby
                      ------------------------------                      
represents and warrants that as of the date hereof and after giving effect
hereto:

          (a) no Default under the Agreement has occurred and is continuing; and

          (b) each representation and warranty of the Borrower set forth in the
     Agreement is true and correct as though made on and as of this date.

          SECTION 7. Governing Law.  This Amendment shall be governed by and
                     -------------                                          
construed in accordance with the laws of the State of New York.

                                       2

 
          SECTION 8.  Counterparts; Conditions to Effectiveness.  This Amendment
                      -----------------------------------------                 
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument.  This Amendment shall become effective as of the date hereof when
the Agent shall have received:

          (a) duly executed counterparts hereof signed by the Borrower and the
     Banks (or, in the case of any party as to which an executed counterpart
     shall not have been received, the Agent shall have received telegraphic,
     telex or other written confirmation from such party of execution of a
     counterpart hereof by such party);

          (b) a duly executed Note for each New Bank (a "New Note"), dated on or
     before the date of effectiveness hereof and otherwise in compliance with
     Section 2.05 of the Agreement;

          (c) an opinion of counsel for the Borrower, addressed to the Banks and
     the Agent, substantially in the form of Exhibit A hereto (which the
     Borrower hereby expressly instructs such counsel to prepare and deliver);

          (d) a certificate signed by the Chief Financial Officer of the
     Borrower, dated the date hereof, to the effect that no Default shall have
     occurred and be continuing and that the representations and warranties of
     the Borrower contained in the Agreement, as amended hereby, shall be true
     and correct as of the date of effectiveness hereof; and

          (e) all documents that the Agent may reasonably request relating to
     the existence of the Borrower, the corporate authority for and validity of
     this Amendment and the New Notes, and any other matters relevant hereto,
     all in form and substance satisfactory to the Agent.

                                       3

 
          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed as of the date first above written.


                         ARMSTRONG WORLD INDUSTRIES,INC.



                         By: /s/ Frank A. Riddick, III
                             -------------------------------
                             Title: Senior Vice President
                                     and C.F.O.



                         By: /s/ Stephen C. Hendrix
                             -------------------------------
                             Title: Treasurer
                         313 West Liberty Street
                         Lancaster, PA  17603
                         Facsimile number: 717-396-2408

                                       4

 
Commitments
- -----------


$38,000,000                MORGAN GUARANTY TRUST COMPANY
                               OF NEW YORK



                           By /s/ Laura E. Reim
                              -------------------------------- 
                              Title: Vice President


$29,000,000                ABN AMRO BANK N.V.
                           By: ABN AMRO NORTH AMERICA, INC.,           
                               as Agent



                           By /s/ James M. Janovsky
                              -------------------------------- 
                              Title: Group V.P. and Director



                           By /s/ Dennis F. Lennon
                              -------------------------------- 
                              Title: V.P. and Director


$29,000,000                BANK OF AMERICA NATIONAL TRUST
                             AND SAVINGS ASSOCIATION



                           By /s/ Dale Robert Mason
                              -------------------------------- 
                              Title: Vice President


$29,000,000                CHEMICAL BANK



                           By /s/ Peter C. Eckstein
                              -------------------------------- 
                              Title: Vice President


$29,000,000                MELLON BANK, N.A.



                           By /s/ Gilbert B. Mateer
                              -------------------------------- 
                              Title: Vice President

                                       5

 
$29,000,000                SOCIETE GENERALE



                           By /s/ Bruce Drossman
                              ------------------------------ 
                              Title: Vice President


$29,000,000                UNION BANK OF SWITZERLAND



                           By /s/ Peter B. Yearley
                              ------------------------------ 
                              Title: Managing Director



                           By /s/ James P. Kelleher
                              ------------------------------ 
                              Title: Assistant Vice
                                     President


$29,000,000                WACHOVIA BANK OF GEORGIA, N.A.



                           By /s/ Adam T. Ogburn
                              ------------------------------ 
                              Title: Vice President


$29,000,000                WESTDEUTSCHE LANDESBANK    
                             GIROZENTRALE, NEW YORK AND 
                             CAYMAN ISLANDS BRANCHES



                            By /s/ Franz J. Vohn
                               -----------------------------  
                               Title: Vice President



                            By /s/ Karen Hoplock    
                               -----------------------------  
                               Title: Vice President

                                       6

 
$15,000,000                BARCLAYS BANK PLC



                           By /s/ Terance Bullock
                              -------------------
                              Title: Associate Director


$15,000,000                STANDARD CHARTERED BANK



                           By /s/ Marianne R. Murray
                              ----------------------
                              Title: Vice President


$-0-                       CITIBANK, N.A.



                           By /s/ William G. Martens III
                              --------------------------
                              Title: Attorney-In-Fact


Total Commitments

$300,000,000
=================


                           MORGAN GUARANTY TRUST COMPANY
                             OF NEW YORK, as Agent



                           By /s/ Laura E. Reim
                              -----------------
                              Title: Vice President
                           60 Wall Street
                           New York, New York  10260-0060
                           Attention: Laura E. Reim
                           Telex number: 177615
                           Facsimile number: (212) 648-5336

                                       7

 
                               PRICING SCHEDULE


          The "Euro-Dollar Margin", "CD Margin" and "Facility Fee Rate" for any
day are the respective percentages set forth below in the applicable row under
the column corresponding to the Status that exists on such day:


 
 
             Level    Level   Level        Level    Level    Level    Level    Level    Level    Level    Level
  Status       I       II      III          IV        V       VI       VII     VIII      IX        X       XI
 
                                                                         
 
Euro-
Dollar       0.1225%  0.1300%     0.1500%  0.1675%  0.1850%  0.2050%  0.2500%  0.2550%  0.2750%  0.3000%  0.5000%
Margin
 
CD Margin    0.2475%  0.2550%     0.2750%  0.2925%  0.3100%  0.3300%  0.3750%  0.3800%  0.4000%  0.4250%  0.6250%
 
Facility
Fee Rate     0.0650%  0.0700%     0.0750%  0.0825%  0.0900%  0.0950%  0.1000%  0.1200%  0.1250%  0.1750%  0.2500%
 
================================================================================================================


 
     For purposes of this Schedule, the following terms have the following
meanings:


     "Moody's" means Moody's Investors Service, Inc.

     "S&P" means Standard & Poor's Rating Service.

     "Status" refers to the determination of which of Level I through XI exists
at any date, based on the credit ratings in effect on such date and the table
below.

     The credit ratings to be utilized for purposes of this Schedule are those
assigned to the senior unsecured long-term debt securities of the Borrower
without third-party redit enhancement, and any rating assigned to any other debt
security of the Borrower shall be disregarded.  The rating in effect at any date
is that in effect at the close of business on such date.


                                       2

 
                                Pricing Levels
                                --------------


 
 
Moody's                            S&P                              Level   
- ---------                          ----                             ----- 
                                                                 
                                                                          
Aa3                                AA-                              I     
A1                                 AA-                              I     
A2                                 AA-                              II    
A3                                 AA-                              II    
Baa1                               AA-                              III   
Baa2                               AA-                              III   
Baa3                               AA-                              IV    
Ba1                                AA-                              IV    
Aa3                                A+                               I     
A1                                 A+                               II    
A2                                 A+                               III   
A3                                 A+                               III   
Baa1                               A+                               III   
Baa2                               A+                               IV    
Baa3                               A+                               IV    
Ba1                                A+                               VI    
Aa3                                A                                II    
A1                                 A                                III   
A2                                 A                                III   
A3                                 A                                III   
Baa1                               A                                IV    
Baa2                               A                                IV    
Baa3                               A                                VI    
Ba1                                A                                VI    
Aa3                                A-                               II    
A1                                 A-                               III   
A2                                 A-                               III   
A3                                 A-                               IV    
Baa1                               A-                               V     
Baa2                               A-                               VI    
Baa3                               A-                               VI    
Ba1                                A-                               VIII  
Aa3                                BBB+                             III   
A1                                 BBB+                             IV    
A2                                 BBB+                             IV    
A3                                 BBB+                             V     
Baa1                               BBB+                             VI    
Baa2                               BBB+                             VII   
Baa3                               BBB+                             VIII  
Ba1                                BBB+                             VIII  
Aa3                                BBB                              III   
A1                                 BBB                              IV    
A2                                 BBB                              IV    
 


                                       3

 

  
                                                                
A3                                 BBB                              VI   
Baa1                               BBB                              VII  
Baa2                               BBB                              VIII 
Baa3                               BBB                              IX   
Ba1                                BBB                              X    
Aa3                                BBB-                             IV   
A1                                 BBB-                             IV   
A2                                 BBB-                             VI   
A3                                 BBB-                             VI   
Baa1                               BBB-                             VIII 
Baa2                               BBB-                             IX   
Baa3                               BBB-                             X    
Ba1                                BBB-                             XI   
Aa3                                BB+                              IV   
A1                                 BB+                              VI   
A2                                 BB+                              VI   
A3                                 BB+                              VIII 
Baa1                               BB+                              VIII 
Baa2                               BB+                              X    
Baa3                               BB+                              XI   
Ba1                                BB+                              XI    
 


Note:  A rating of Aa3 (Moody's) or AA- (S&P) includes any higher rating.  A
- ----                                                                        
rating of Ba1 (Moody's) or BB+ (S&P) includes any lower rating (or the absence
of a rating).

                                       4

 
                                                                       EXHIBIT A
                                                                       ---------


                                   OPINION OF
                            COUNSEL FOR THE BORROWER
                            ------------------------



                                       April __, 1996



To the Banks and the Agent
  Referred to Below
c/o Morgan Guaranty Trust Company
  of New York, as Agent
60 Wall Street
New York, New York  10260

Dear Sirs:

        I have acted as counsel for Armstrong World Industries, Inc. (the
"Borrower") in connection with the Credit Agreement dated as of February 7,
1995, as amended by Amendment No. 1 dated as of April 9, 1996 (the "Agreement")
among the Borrower, the banks listed on the signature pages of Amendment No. 1
and Morgan Guaranty Trust Company of New York, as Agent.  Terms defined in the
Agreement are used herein as therein defined.

        I have examined originals or copies, certified or otherwise identified
to my satisfaction, of such documents, corporate records, certificates of public
officials and other instruments and have conducted such other investigations of
fact and law as I have deemed necessary or advisable for purposes of this
opinion.

        I am licensed to practice law in the Commonwealth of Pennsylvania.  The
law covered by this opinion is limited to the laws of the Commonwealth of
Pennsylvania and the Federal laws of the United States.  I have assumed for the
purposes of this opinion that the substantive law of the State of New York is
identical in all material respects to the substantive law of the Commonwealth of
Pennsylvania.

        Upon the basis of the foregoing, I am of the opinion that:

        1.  The Borrower is a corporation duly incorporated, validly existing
and in good standing under the laws of Pennsylvania, and has all corporate
powers and all material

 
governmental licenses, authorizations, consents and approvals required to carry
on its business as now conducted.

        2.  The execution, delivery and performance by the Borrower of the
Agreement and the Notes are within the Borrower's corporate powers, have been
duly authorized by all necessary corporate action, require no action by or in
respect of, or filing with, any governmental body, agency or official and do not
contravene, or constitute a default under, any provision of applicable law or
regulation or of the articles of incorporation or by-laws of the Borrower or of
any agreement, judgment, injunction, order, decree or other instrument binding
upon the Borrower or any of its Subsidiaries or result in the creation or
imposition of any Lien on any asset of the Borrower or any of its Subsidiaries.

        3.  The Agreement constitutes a valid and binding agreement of the
Borrower and each Note constitutes a valid and binding obligation of the
Borrower, in each case enforceable in accordance with its terms, except as the
same may be limited by bankruptcy, insolvency or similar laws affecting
creditors' rights generally and by general principles of equity.

        4.  Except as disclosed in the Borrower's 199_ Form 10-K or in the
Borrower's Latest Form 10-Q, there is no action, suit or proceeding pending
against, or to the best of my knowledge threatened against or affecting, the
Borrower or any of its Subsidiaries before any court or arbitrator or any
governmental body, agency or official, in which there is a reasonable
possibility of an adverse decision which could materially adversely affect the
business, financial position, operations or prospects of the Borrower and its
Consolidated Subsidiaries, considered as a whole, or the ability of the Borrower
to perform its obligations under the Agreement and the Notes, or which in any
manner draws into question the validity of the Agreement or the Notes.

        5.  Each of the Borrower's Significant Subsidiaries is a corporation
validly existing and in good standing under the laws of its jurisdiction of
incorporation, and has all corporate powers and all material governmental
licenses, authorizations, consents and approvals required to carry on its
business as now conducted.

                                       2

 
                                       Very truly yours,



                                       3