Exhibit 1.2


                                             Shares
                              ---------------

                        ARMSTRONG WORLD INDUSTRIES, INC.

                    COMMON STOCK (PAR VALUE $1.00 PER SHARE)



                             UNDERWRITING AGREEMENT



          , 1996
- ----------

 
                                                                         , 1996
                                                            -------------


Morgan Stanley & Co.
  Incorporated
[NAMES OF OTHER CO-MANAGERS]
c/o Morgan Stanley & Co.
      Incorporated
    1585 Broadway
    New York, New York  10036

Dear Sirs and Mesdames:


          Armstrong World Industries, Inc., a Pennsylvania corporation (the
"Company"), proposes to issue and sell to the several Underwriters named in
Schedule I hereto (the "Underwriters")                shares of its Common
                                       ---------------
Stock (par value $1.00 per share) (the "Firm Shares").  The Company also
proposes to issue and sell to the several Underwriters not more than an
additional               shares of its Common Stock (par value $1.00 per share)
           --------------
(the "Additional Shares") if and to the extent that you, as Managers of the
offering, shall have determined to exercise, on behalf of the Underwriters, the
right to purchase such shares of common stock granted to the Underwriters in
Section 2 hereof.  The Firm Shares and the Additional Shares are hereinafter
collectively referred to as the "Shares."  The shares of Common Stock (par value
$1.00 per share) of the Company to be outstanding after giving effect to the
sales contemplated hereby are hereinafter referred to as the "Common Stock."

          The Company has filed with the Securities and Exchange Commission (the
"Commission") a registration statement, including a prospectus, relating to,
among other securities, the Shares, and has filed with, or transmitted for
filing to, or shall promptly hereafter file with or transmit for filing to, the
Commission a prospectus supplement (the "Prospectus Supplement") specifically

relating to the Shares pursuant to Rule 424 under the Securities Act of 1933,
as amended (the "Securities Act").  The term "Registration Statement" means the
registration statement, including the exhibits thereto, as amended to the date
of this Agreement including the information (if any) deemed to be part of the
registration statement at the time of effectiveness pursuant to Rule 430A under
the Securities

                                       2

 
Act.  The term "Basic Prospectus" means the prospectus included in the
Registration Statement.  The term "Prospectus" means the Basic Prospectus
together with the Prospectus Supplement.  The term "preliminary prospectus"
means a preliminary prospectus supplement specifically relating to the Shares,
together with the Basic Prospectus.  As used herein, the terms "Basic
Prospectus," "Prospectus" and "preliminary prospectus" shall include in each
case the documents, if any, incorporated by reference therein.  The terms
"supplement," "amendment" and "amend" as used herein shall include all documents
deemed to be incorporated by reference in the Prospectus that are filed
subsequent to the date of the Basic Prospectus by the Company with the
Commission pursuant to the Securities Exchange Act of 1934, as amended (the
"Exchange Act")./1/

          1.   Representations and Warranties.  The Company represents and 
               ------------------------------ 
warrants to and agrees with each of the Underwriters that:

          (a)  The Registration Statement has become effective; no stop order
     suspending the effectiveness of the Registration Statement is in effect,
     and, to the Company's knowledge after reasonable investigation, no
     proceedings for such purpose are pending before or threatened by the
     Commission.

          (b)  (i)  Each document, if any, filed or to be filed pursuant to the
     Exchange Act and incorporated by reference in the Prospectus complied or
     will comply when so filed in all material respects with the Exchange Act
     and the applicable rules and regulations

- ------------------- 
/1/  If prospectus delivery will be accomplished using Rule 434 under the
Securities Act, the above definition of Prospectus should be replaced with the
following:

The Prospectus (as described in Rule 434(a)(1) under the Securities Act) in the
form first used to confirm sales of Shares is hereinafter referred to as the
"Distributed Prospectus"; the prospectus included in the Registration Statement
at the time of its effectiveness (including the information, if any, deemed to
be a part of the Registration Statement at the time of effectiveness pursuant to
Rule 430A under the Securities Act) is hereinafter referred to as the "Filed
Prospectus"; and the Distributed Prospectus and the Filed Prospectus are
hereinafter referred to collectively as the "Prospectus."

                                       3

 
     of the Commission thereunder, (ii) The Registration Statement, when it
     became effective, did not contain and, as amended or supplemented, if
     applicable, will not contain any untrue statement of a material fact or
     omit to state a material fact required to be stated therein or necessary
     to make the statements therein not misleading, (iii) the Registration
     Statement and the Prospectus comply and, as amended or supplemented, if
     applicable, will comply in all material respects with the Securities Act
     and the applicable rules and regulations of the Commission thereunder and
     (iv) the Prospectus does not contain and, as amended or supplemented, if
     applicable, will not contain any untrue statement of a material fact or
     omit to state a material fact necessary to make the statements therein, in
     the light of the circumstances under which they were made, not misleading,
     except that the representations and warranties set forth in this paragraph
     1(b) do not apply to statements or omissions in the Registration Statement
     or the Prospectus based upon information furnished to the Company in
     writing by such Underwriter through you expressly for use therein.

          (c)  The Company has been duly incorporated, is validly existing as a
     corporation in good standing under the laws of the jurisdiction of its
     incorporation, has the corporate power and authority to own its property
     and to conduct its business as described in the Prospectus and is duly
     qualified to transact business and is in good standing in each jurisdiction
     in which the conduct of its business or its ownership or leasing of
     property requires such qualification, except to the extent that the failure
     to be so qualified or be in good standing would not have a material adverse
     effect on the Company and its subsidiaries, taken as a whole.

          (d)  Each "significant subsidiary" (as that term is used in Rule 1-
     02(w) of Regulation S-X under the Securities Act) (a "Material Subsidiary")
     of the Company has been duly incorporated, is validly existing as a
     corporation in good standing under the laws of the jurisdiction of its
     incorporation, has the corporate power and authority to own its property
     and to conduct its business as described in the Prospectus and is duly
     qualified to transact business and is in good standing in each jurisdiction
     in which the conduct of its business or its ownership or leasing of
     property requires such qualification, except to the extent that the failure
     to be so qualified or be in good standing

                                       4

 
     would not have a material adverse effect on the Company and its
     subsidiaries, taken as a whole.

          (e)  This Agreement has been duly authorized, executed and delivered
     by the Company.

          (f)  The authorized capital stock of the Company conforms as to legal
     matters to the description thereof contained in the Prospectus.

          (g)  The shares of Common Stock outstanding prior to the issuance of
     the Shares have been duly authorized and are validly issued, fully paid and
     non-assessable.

          (h)  The Shares have been duly authorized and, when issued and
     delivered in accordance with the terms of this Agreement, will be validly
     issued, fully paid and non-assessable, and the issuance of such Shares will
     not be subject to any preemptive or similar rights.

          (i)  The execution and delivery by the Company of, and the performance
     by the Company of its obligations under, this Agreement will not contravene
     any provision of applicable law or the articles of incorporation or by-laws
     of the Company or any agreement or other instrument binding upon the
     Company or any of its subsidiaries that is material to the Company and its
     subsidiaries, taken as a whole, or any judgment, order or decree of any
     governmental body, agency or court having jurisdiction over the Company or
     any subsidiary, and no consent, approval, authorization or order of, or
     qualification with, any governmental body or agency is required for the
     performance by the Company of its obligations under this Agreement, except
     such as may be required by Rule 424(b) under the Securities Act or the
     securities or Blue Sky laws of the various states in connection with the
     offer and sale of the Shares.

          (j)  There has not occurred any material adverse change, or, to the
     Company's knowledge, any development involving a prospective material
     adverse change, in the condition, financial or otherwise, or in the
     earnings, business or operations of the Company and its subsidiaries, taken
     as a whole, from that set forth in the Prospectus (exclusive of any
     amendments or supplements thereto subsequent to the date of this
     Agreement).

                                       5

 
          (k)  There are no legal or governmental proceedings pending or
     threatened to which the Company or any of its subsidiaries is a party or to
     which any of the properties of the Company or any of its subsidiaries is
     subject that are required to be described in the Registration Statement or
     the Prospectus and are not so described or any statutes, regulations,
     contracts or other documents that are required to be described in the
     Registration Statement or the Prospectus or to be filed as exhibits to the
     Registration Statement that are not described or filed as required.

          (l)  Each preliminary prospectus filed as part of the registration
     statement as originally filed or as part of any amendment thereto, or filed
     pursuant to Rule 424 under the Securities Act, complied when so filed in
     all material respects with the Securities Act and the applicable rules and
     regulations of the Commission thereunder.

          (m)  The Company is not and, after giving effect to the offering and
     sale of the Shares and the application of the proceeds thereof as described
     in the Prospectus, will not be an "investment company" as such term is
     defined in the Investment Company Act of 1940, as amended.

          (n)  There are no contracts, agreements or understandings between the
     Company and any person granting such person the right to require the
     Company to file a registration statement under the Securities Act with
     respect to any securities of the Company or to require the Company to
     include such securities with the Shares registered pursuant to the
     Registration Statement.

          (o)  The Company has complied with all provisions of Section 517.075,
     Florida Statutes relating to doing business with the Government of Cuba or
     with any person or affiliate located in Cuba.

          2.   Agreements to Sell and Purchase.  The Company hereby agrees to
               --------------------------------                              
sell to the several Underwriters, and each Underwriter, upon the basis of the
representations and warranties herein contained, but subject to the conditions
hereinafter stated, agrees, severally and not jointly, to purchase from the
Company the respective numbers of Firm Shares set forth in Schedule I hereto
opposite its name at $       a share (the "Purchase Price").
                      ------ 

                                       6

 
          On the basis of the representations and warranties contained in this
Agreement, and subject to its terms and conditions, the Company agrees to sell
to the Underwriters the Additional Shares, and the Underwriters shall have a
one-time right to purchase, severally and not jointly, up to
                                                             ---------------
Additional Shares at the Purchase Price.  If you, on behalf of the Underwriters,
elect to exercise such option, you shall so notify the Company in writing not
later than 30 days after the date of this Agreement, which notice shall specify
the number of Additional Shares to be purchased by the Underwriters and the date
on which such shares are to be purchased.  Such date may be the same as the
Closing Date (as defined below) but not earlier than the Closing Date nor later
than ten business days after the date of such notice.  Additional Shares may be
purchased as provided in Section 4 hereof solely for the purpose of covering
over-allotments made in connection with the offering of the Firm Shares.  If any
Additional Shares are to be purchased, each Underwriter agrees, severally and
not jointly, to purchase the number of Additional Shares (subject to such
adjustments to eliminate fractional shares as you may determine) that bears the
same proportion to the total number of Additional Shares to be purchased as the
number of Firm Shares set forth in Schedule I hereto opposite the name of such
Underwriter bears to the total number of Firm Shares.

          The Company hereby agrees that, without the prior written consent of
Morgan Stanley & Co. Incorporated on behalf of the Underwriters, it will not,
during the period ending [180] days after the date of the Prospectus, (i) offer,
pledge, sell, contract to sell, sell any option or contract to purchase,
purchase any option or contract to sell, grant any option, right or warrant to
purchase or otherwise transfer or dispose of, directly or indirectly, any shares
of Common Stock or any securities convertible into or exercisable or
exchangeable for Common Stock or (ii) enter into any swap or other arrangement
that transfers to another, in whole or in part, any of the economic consequences
of ownership of the Common Stock, whether any such transaction described in
clause (i) or (ii) above is to be settled by delivery of Common Stock or such
other securities, in cash or otherwise.  The foregoing sentence shall not apply
to (A) the Shares to be sold hereunder or (B) the issuance by the Company of
shares of Common Stock upon the exercise of an option or warrant or the
conversion of a security outstanding on the date hereof of which the
Underwriters have been advised in writing.

                                       7

 
          3.  Terms of Public Offering.  The Company is advised by you that the
              -------------------------                                        
Underwriters propose to make a public offering of their respective portions of
the Shares as soon after the Registration Statement and this Agreement have
become effective as in your judgment is advisable.  The Company is further
advised by you that the Shares are to be offered to the public initially at
$              a share (the "Public Offering Price") and to certain dealers
 -------------
selected by you at a price that represents a concession not in excess of $
                                                                          ------
a share under the Public Offering Price, and that any Underwriter may allow, and
such dealers may reallow, a concession, not in excess of $      a share, to any
                                                          ----- 
Underwriter or to certain other dealers.

          4.   Payment and Delivery.  Payment for the Firm Shares shall be made
               ---------------------                                           
by check or wire transfer payable to the order of the Company in federal (same
day) funds in New York City against delivery of such Firm Shares for the
respective accounts of the several Underwriters at 10:00 A.M., New York City
time, on             , 19  ,/2/ or at such other time on the same or such other
         ------------    -- 
date, not later than          , 19  ,/3/ as shall be designated in writing by
                     ---------    --
you.  The time and date of such payment are hereinafter referred to as the
"Closing Date."

Payment for any Additional Shares shall be made by check or wire
transfer payable to the order of the Company in federal (same day) funds
available in New York City against delivery of such Additional Shares for the
respective accounts of the several Underwriters at 10:00 A.M., New York City
time, on the date specified in the notice described in Section 2 or at such
other time on the same or on such other date, in any event not later than
       , 19  ,/4/ as shall be designated in writing by you.  The time and date
- -------    --
of such payment are hereinafter referred to as the "Option Closing Date."

Certificates for the Firm Shares and Additional Shares shall be in
definitive form and registered in such

- -------------------
/2/  Insert date 3 business days or, in the event the offering is priced after
4:30 P.M. Eastern Time, 4 business days after date of Underwriting Agreement.

/3/  Insert date 5 business days after the date inserted in accordance with 
note 6 above.
          
/4/  Insert date 10 business days after the expiration of the green shoe 
option.

                                       8

 
names and in such denominations as you shall request in writing not later than
one full business day prior to the Closing Date or the Option Closing Date, as
the case may be.  The certificates evidencing the Firm Shares and Additional
Shares shall be delivered to you on the Closing Date or the Option Closing Date,
as the case may be, for the respective accounts of the several Underwriters,
with any transfer taxes payable in connection with the transfer of the Shares to
the Underwriters duly paid, against payment of the Purchase Price therefor.

          5.   Conditions to the Underwriters' Obligations. The several 
               --------------------------------------------
obligations of the Underwriters are subject to the
following conditions:

          (a)  Subsequent to the execution and delivery of this Agreement and
     prior to the Closing Date:

               (i)  there shall not have occurred any downgrading, nor shall any
          notice have been given of any intended or potential downgrading or of
          any review for a possible change that does not indicate the direction
          of the possible change, in the rating accorded any of the Company's
          securities by any "nationally recognized statistical rating
          organization," as such term is defined for purposes of Rule 436(g)(2)
          under the Securities Act; and

               (ii) there shall not have occurred any change, or any development
          involving a prospective change, in the condition, financial or
          otherwise, or in the earnings, business or operations of the Company
          and its subsidiaries, taken as a whole, from that set forth in the
          Prospectus (exclusive of any amendments or supplements thereto
          subsequent to the date of this Agreement) that, in your reasonable
          judgment, is material and adverse and that makes it, in your
          reasonable judgment, impracticable to market the Shares on the terms
          and in the manner contemplated in the Prospectus.

          (b)  The Underwriters shall have received on the Closing Date a
     certificate, dated the Closing Date and signed by an executive officer of
     the Company, to the effect set forth in clause (a)(i) above and to the
     effect that the representations and warranties of the Company contained in
     this Agreement are true and correct as of the Closing Date and that the
     Company has complied with all of the agreements and satisfied all

                                       9

 
     of the conditions on its part to be performed or satisfied hereunder on 
     or before the Closing Date.

     The officer signing and delivering such certificate may rely upon the best
     of his or her knowledge as to proceedings threatened.

          (c)  The Underwriters shall have received on the Closing Date an
     opinion of Buchanan Ingersoll Professional Corporation, outside counsel for
     the Company, dated the Closing Date, substantially to the effect that:

               (i)  the Company has been duly incorporated, is validly
          existing as a corporation in good standing under the laws of the
          jurisdiction of its incorporation, has the corporate power and
          authority to own its property and to conduct its business as described
          in the Prospectus.

               (ii) the authorized capital stock of the Company conforms as
          to legal matters to the description thereof contained in the
          Prospectus;

               (iii) the shares of Common Stock outstanding prior to the
          issuance of the Shares have been duly authorized and are validly
          issued, fully paid and non-assessable;

               (iv) the Shares have been duly authorized and, when issued
          and delivered in accordance with the terms of this Agreement, will be
          validly issued, fully paid and non-assessable, and the issuance of
          such Shares will not be subject to any preemptive or similar rights;

               (v)  this Agreement has been duly authorized, executed and
          delivered by the Company;

               (vi) the execution and delivery by the Company of, and the
          performance by the Company of its obligations under, this Agreement
          will not contravene any provision of applicable law (except to the
          extent that the federal securities laws may limit or restrict any
          indemnification provisions set forth in this Agreement) or the
          articles of incorporation or by-laws of the Company, and no consent,
          approval, authorization or order of, or qualification with, any
          governmental body or agency is required for the performance by the
          Company of its obligations under this Agreement, except for the
          registration of the Shares under the Securities Act and except such as
          may be required by Rule 424(b) under the Securities Act or the
          securities or Blue Sky laws of the various states in connection with
          the offer and sale of the Shares;

               (vii) the statements in the Prospectus under the caption
          "Description of Capital Stock" fairly present the information called 
          for and fairly summarize the matters referred to therein;
       
                                      10

 
               (viii) the Company is not and, after giving effect to the
          offering and sale of the Shares and the application of the proceeds
          thereof as described in the Prospectus, will not be an "investment
          company" as such term is defined in the Investment Company Act of
          1940, as amended;

               (ix)  such counsel is of the opinion ascribed to it in the
          Prospectus under the caption "Taxation";

               (x) such counsel (A) is of the opinion that the Registration
          Statement and the Prospectus and any further amendments and
          supplements thereto made by the Company prior to the delivery of the
          Shares (other than the financial statements and related schedules and
          other financial data therein) comply as to form in all material
          respects with the requirements of the Securities Act and the Exchange
          Act, as the case may be, and the rules and regulations thereunder, and
          (B) is of the further opinion that, although such counsel (i) is not
          passing upon and does not assume any responsibility for the accuracy
          or completeness of the statements contained in the Registration
          Statement or the Prospectus, and (ii) has not made an independent
          investigation of facts for the purpose of rendering its opinion,
          during the course of preparation of the Registration Statement and the
          Prospectus, nothing came to such counsel's attention which would cause
          them to believe that the Registration Statement, at the time it became
          effective and as amended or supplemented, contained any untrue
          statement of a material fact or omitted to state any material fact
          required to be stated therein or necessary to make the statements
          therein not misleading or that the Prospectus, as of the date of the
          Prospectus and as of the date such opinion is delivered, contains any
          untrue statement of a material fact or omits to state a material fact
          necessary in order to make the statements therein, in the light of the
          circumstances under which they were made,


                                      11

 
          not misleading; provided, however that such counsel need not express
                          --------- -------
          any opinion as to (1) the financial statements, including the notes
          and schedules thereto, and any financial data contained or referred to
          in, or incorporated by reference in, the Registration Statement or the
          Prospectus, or (2) the information contained in or omitted from the
          Registration Statement or Prospectus in reliance upon and in
          conformity with written information furnished to the Company relating
          to any Underwriter by or on behalf of any of the Underwriters for use
          in connection with the preparation of the Registration Statement or
          the Prospectus./5/



     In rendering its opinion, Buchanan Ingersoll may rely (i) as to matters of
     New York law, on the opinion of Sullivan & Cromwell referred to in Section
     5(e) hereof, and (ii) as to factual matters, on certificates of officers of
     the Company and its subsidiaries and on certificates of public officials.

          (d)  The Underwriters shall have received on the Closing Date an
     opinion of the General Counsel of the Company, dated the Closing Date, to
     the effect that:

               (i) each Material Subsidiary is validly existing as a
          corporation in good standing under the laws of the jurisdiction of its
          incorporation, has the corporate power and authority to own its
          property and to conduct its business as described in the Prospectus;
          and each of the Company and each of its Material Subsidiaries is duly
          qualified to transact business and is in good standing in each
          jurisdiction in which the conduct of its business or its ownership or
          leasing of property requires such qualification, except to the extent
          that the failure to be so qualified or be in good standing would not
          have a material adverse effect on the Company and its subsidiaries,
          taken as a whole;

- -------------------
/5/  If prospectus delivery will be accomplished using Rule 434 under the
     Securities Act, consider adding the following to the opinions of Company
     counsel and Morgan Stanley's counsel:
 
          "The Distributed Prospectus is not materially different from the
     Filed Prospectus."

                                      12

 
               (ii) the statements in the Registration Statement in Items 14 and
          15, in each case insofar as such statements constitute summaries of
          the legal matters, documents or proceedings referred to therein,
          fairly present the information called for with respect to such legal
          matters, documents and proceedings and fairly summarize the matters
          referred to therein;

               (iii)  after due inquiry, such counsel does not know of any
          legal or governmental proceedings pending or threatened to which the
          Company or any of its Material Subsidiaries is a party or to which any
          of the properties of the Company or any of its Material Subsidiaries
          is subject that are required to be described in the Registration
          Statement or the Prospectus and are not so described or of any
          statutes, regulations, contracts or other documents that are required
          to be described in the Registration Statement or the Prospectus or to
          be filed as exhibits to the Registration Statement that are not
          described or filed as required; and

               (iv) the execution and delivery by the Company of, and the
          performance by the Company of its obligations under, this Agreement
          will not contravene any provision of the articles of incorporation or
          by-laws of the Company or, to the best of such counsel's knowledge,
          any agreement or other instrument binding upon the Company or any of
          its subsidiaries that is material to the Company and its subsidiaries,
          taken as a whole, or, to the best of such counsel's knowledge, any
          judgment, order or decree of any governmental body, agency or court
          having jurisdiction over the Company or any subsidiary.



                                      13

 
          With respect to subparagraph (ix) of paragraph (c) above, Buchanan
     Ingersoll may state that their opinion and belief are based upon their
     participation in the preparation of the Registration Statement and
     Prospectus and any amendments or supplements thereto and review and
     discussion of the contents thereof, but are without independent check or
     verification, except as specified.

          The opinion of Buchanan & Ingersoll described in paragraph (c) above
     shall be rendered to the Underwriters at the request of the Company and
     shall so state therein.

          (e) The Underwriters shall have received on the Closing Date an
     opinion of Sullivan & Cromwell, counsel for the Underwriters, dated the
     Closing Date, covering the matters referred to in subparagraphs (iv) and
     (v) of paragraph (c) above.  In rendering such opinion, Sullivan & Cromwell
     may rely as to the incorporation of the Company and all other matters of
     Pennsylvania law upon the opinion of Buchanan Ingersoll referred to in
     paragraph (c) above.  The Underwriter also shall have received a letter
     from Sullivan & Cromwell to the effect that each part of the Registration
     Statement and the Prospectus, as of the effective date of such part,
     appeared on its face to be appropriately responsive in all material
     respects to the requirements of the Securities Act and the applicable rules
     and regulations of the Commission thereunder; and nothing that came to such
     counsel's attention in the course of their review of the Registration
     Statement and Prospectus has caused such counsel to believe that the
     Registration Statement, as of its effective date, or the Prospectus, as of
     the date of the Prospectus, contained any untrue statement of a material
     fact or omitted to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading; and nothing that
     has come to such counsel's attention in the course of the limited
     procedures described in such letter has caused them to believe that the
     Prospectus, as of the date and time of delivery of such letter, contained
     any untrue statement of a material fact or omitted to state any material
     fact necessary in order to make the statements therein, in the light of the
     circumstances under which they were made, not misleading.  Such counsel may
     state that they

                                      14

 
     do not assume any responsibility for the accuracy, completeness or fairness
     of the statements contained in the Registration Statement or the Prospectus
     except for those made under the captions "Description of Capital Stock" in
     the Prospectus insofar as they related to provisions of documents therein
     described and that they do not express any opinion or belief as to the
     financial statements or other financial data contained in the Registration
     Statement or the Prospectus.

          (f)  The Underwriters shall have received, on each of the date hereof
     and the Closing Date, a letter dated the date hereof or the Closing Date,
     as the case may be, in form and substance satisfactory to the Underwriters,
     from KPMG Peat Marwick LLP, independent public accountants, containing
     statements and information of the type ordinarily included in accountants'
     "comfort letters" to underwriters with respect to the financial statements
     and certain financial information contained in the Registration Statement
     and the Prospectus; provided that the letter delivered on the Closing Date
                         --------                                              
     shall use a "cut-off date" not earlier than the date hereof.

          (g)  The "lock-up" agreements, each substantially in the form of
     Exhibit A hereto, between you and [certain shareholders,] officers and
     directors of the Company relating to sales and certain other dispositions
     of shares of Common Stock or certain other securities, delivered to you on
     or before the date hereof, shall be in full force and effect on the Closing
     Date.

          The several obligations of the Underwriters to purchase Additional
Shares hereunder are subject to the delivery to you on the Option Closing Date
of such documents as you may reasonably request with respect to the good
standing of the Company, the due authorization and issuance of the Additional
Shares and other matters related to the issuance of the Additional Shares.

          6.   Covenants of the Company.  In further consideration of the
               -------------------------                                 
agreements of the Underwriters herein contained, the Company covenants with each
Underwriter as follows:

                                      15

 
          (a)  To furnish to you, without charge, ______ /6/ signed copies
     of the Registration Statement (including exhibits thereto) and for delivery
     to each other Underwriter a conformed copy of the Registration Statement
     (without exhibits thereto) and to furnish to you in New York City, without
     charge, prior to 10:00 A.M. New York City time on the business day next
     succeeding the date of this Agreement and during the period mentioned in
     paragraph (c) below, as many copies of the Prospectus,/7/ any documents
     incorporated by reference therein, and any supplements and amendments
     thereto or to the Registration Statement as you may reasonably request.

          (b)  Before amending or supplementing the Registration Statement or
     the Prospectus, to furnish to you a copy of each such proposed amendment or
     supplement and not to file any such proposed amendment or supplement to
     which you reasonably object, and to file with the Commission within the
     applicable period specified in Rule 424(b) under the Securities Act any
     prospectus required to be filed pursuant to such Rule.

          (c)  If, during such period after the first date of the public
     offering of the Shares as the Prospectus is required by law to be delivered
     in connection with sales by an Underwriter or dealer, any event shall occur
     or condition exist as a result of which it is necessary to amend or
     supplement the Prospectus in order to make the statements therein, in the
     light of the circumstances when the Prospectus is delivered to a purchaser,
     not misleading, or if it is necessary to amend or supplement the Prospectus
     to comply with applicable law, the Company will forthwith prepare and file
     with the Commission and furnish, at its own expense, to the Underwriters
     and to the dealers (whose names and addresses you will furnish to the
     Company) to which Shares may have been sold by you on behalf of the
     Underwriters and to any other dealers upon request, either amendments or
     supplements to the Prospectus so that the statements in the Prospectus as
     so amended or

- -------------------
/6/  Insert number of Co-Managers (including Morgan Stanley) plus one.

/7/  If prospectus delivery will be accomplished using Rule 434 under the
     Securities Act, replace the term "Prospectus" with "Distributed
     Prospectus."

                                      16

 
     supplemented will not, in the light of the circumstances when the
     Prospectus is delivered to a purchaser, be misleading or so that the
     Prospectus, as amended or supplemented, will comply with applicable law.

          (d)  To cooperate with Underwriter's counsel to qualify the Shares for
     offer and sale under the securities or Blue Sky laws of such jurisdictions
     as you shall reasonably request; provided that in connection therewith the
                                      --------                                 
     Company shall not be required to qualify as a foreign corporation or file a
     general consent to service of process in any jurisdiction.

          (e)  To make generally available to the Company's security holders and
     to you as soon as practicable an earning statement covering the twelve-
     month period ending         , 19  /8/ that satisfies the provisions of
                         --------    --
     Section 11(a) of the Securities Act and the rules and regulations of the
     Commission thereunder.  If such fiscal quarter is the last fiscal quarter
     of the Company's fiscal year, such earning statement shall be made
     available not later than 90 days after the close of the period covered
     thereby and in all other cases shall be made available not later than 45
     days after the close of the period covered thereby.

          (f) Whether or not the transactions contemplated in this Agreement are
     consummated or this Agreement is terminated, to pay or cause to be paid all
     expenses incident to the performance of its obligations under this
     Agreement, including:  (i) the fees, disbursements and expenses of the
     Company's counsel and the Company's accountants in connection with the
     registration and delivery of the Shares under the Securities Act and all
     other fees or expenses in connection with the preparation and filing of the
     Registration Statement, any preliminary prospectus, the Prospectus and
     amendments and supplements to any of the foregoing, including all printing
     costs associated therewith, and the mailing and delivering of copies
     thereof to the Underwriters and dealers, in the quantities hereinabove
     specified, (ii) all costs and expenses related to the transfer and delivery
     of the Shares to the Underwriters, including any transfer or other taxes
     payable thereon, (iii) the cost of printing or

- -------------------
/8/  Insert date one year after the end of the Company's fiscal quarter in which
     the closing will occur.

                                      17

 
     producing any Blue Sky or Legal Investment memorandum in connection with
     the offer and sale of the Shares under state securities laws and all
     expenses in connection with the qualification of the Shares for offer and
     sale under state securities laws as provided in Section 6(d) hereof,
     including filing fees and the reasonable fees and disbursements of counsel
     for the Underwriters in connection with such qualification and in
     connection with the Blue Sky or Legal Investment memorandum, (iv) all
     filing fees and disbursements of counsel to the Underwriters incurred in
     connection with the review and qualification of the offering of the Shares
     by the National Association of Securities Dealers, Inc., (v) all fees and
     expenses in connection with the preparation and filing of the registration
     statement on Form 8-A relating to the Common Stock and all costs and
     expenses incident to listing the Shares on the NYSE, (vi) the cost of
     printing certificates representing the Shares, (vii) the costs and charges
     of any transfer agent, registrar or depositary, (viii) the costs and
     expenses of the Company relating to investor presentations on any "road
     show" undertaken in connection with the marketing of the offering of the
     Shares, including, without limitation, expenses associated with the
     production of road show slides and graphics, fees and expenses of any
     consultants engaged in connection with the road show presentations with the
     prior approval of the Company, travel and lodging expenses of the
     representatives and officers of the Company and any such consultants, and
     the cost of any aircraft chartered in connection with the road show, and
     (ix) all other costs and expenses incident to the performance of the
     obligations of the Company hereunder for which provision is not otherwise
     made in this Section.  It is understood, however, that except as provided
     in this Section, Section 7 entitled "Indemnity and Contribution", and the
     last paragraph of Section 9 below, the Underwriters will pay all of their
     costs and expenses, including fees and disbursements of their counsel,
     stock transfer taxes payable on resale of any of the Shares by them and any
     advertising expenses connected with any offers they may make.

          7.   Indemnity and Contribution.  (a)  The Company agrees to indemnify
               ---------------------------                                      
and hold harmless each Underwriter and each person, if any, who controls any
Underwriter within the meaning of either Section 15 of the Securities Act or
Section 20 of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), from and against any and all losses, claims, damages and liabilities
(including, without

                                      18

 
limitation, any legal or other expenses reasonably incurred in connection with
defending or investigating any such action or claim) caused by any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement or any amendment thereof, any preliminary prospectus or
the Prospectus (as amended or supplemented if the Company shall have furnished
any amendments or supplements thereto), or caused by any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, (A) except insofar as
such losses, claims, damages or liabilities are caused by any such untrue
statement or omission or alleged untrue statement or omission based upon
information relating to any Underwriter furnished to the Company in writing by
such Underwriter through you expressly for use therein, or (B) except that the
Company shall not be liable to any Underwriter under this Section 7 to the
extent that any such loss, claim, liability or judgment results solely from an
untrue statement of a material fact contained in, or the omission of a material
fact from, a preliminary Prospectus if such untrue statement or omission was
completely corrected in the applicable Prospectus Supplement prior to the
written confirmation of the sale of the Shares giving rise to such loss, claim,
liability or judgment if the Company shall sustain the burden of proving (x)
that such Underwriter sold the Shares to the person alleging such loss, claim,
damage or liability without sending or giving the applicable Prospectus
Supplement at or prior to the time of written confirmation of the sale of the
Shares giving rise to such loss, claim, liability or judgment, (y) that the
Company had furnished copies of the applicable Prospectus Supplement to such
Underwriter reasonably prior to the written confirmation of such sale, and (z)
such Underwriter would not have been subject to such liability if it had
delivered the applicable Prospectus Supplement to such person at or prior to the
time of written confirmation of such sale.

          (b)  Each Underwriter agrees, severally and not jointly, to indemnify
      and hold harmless the Company, its directors, its officers who sign the
      Registration Statement and each person, if any, who controls the Company
      within the meaning of either Section 15 of the Securities Act or Section
      20 of the Exchange Act to the same extent as the foregoing indemnity from
      the Company to such Underwriter, but only with reference to information
      relating to such Underwriter furnished to the Company in writing by such
      Underwriter through you expressly for use in the 

                                      19

 
      Registration Statement, any preliminary prospectus, the Prospectus or any 
      amendments or supplements thereto.

          (c)  In case any proceeding (including any governmental investigation)
     shall be instituted involving any person in respect of which indemnity may
     be sought pursuant to paragraph (a) or (b) of this Section 7, such person
     (the "indemnified party") shall promptly notify the person against whom
     such indemnity may be sought (the "indemnifying party") in writing and the
     indemnifying party, upon request of the indemnified party, shall retain
     counsel reasonably satisfactory to the indemnified party to represent the
     indemnified party and any others the indemnifying party may designate in
     such proceeding and shall pay the fees and disbursements of such counsel
     related to such proceeding. In any such proceeding, any indemnified party
     shall have the right to retain its own counsel, but the fees and expenses
     of such counsel shall be at the expense of such indemnified party unless
     (i) the indemnifying party and the indemnified party shall have mutually
     agreed to the retention of such counsel or (ii) the named parties to any
     such proceeding (including any impleaded parties) include both the
     indemnifying party and the indemnified party and representation of both
     parties by the same counsel would be inappropriate due to actual or
     potential differing interests between them. It is understood that the
     indemnifying party shall not, in respect of the legal expenses of any
     indemnified party in connection with any proceeding or related proceedings
     in the same jurisdiction, be liable for the fees and expenses of more than
     one separate firm (in addition to any local counsel) for all such
     indemnified parties and that all such fees and expenses shall be reimbursed
     as they are incurred. Such firm shall be designated in writing by Morgan
     Stanley & Co. Incorporated, in the case of parties indemnified pursuant to
     paragraph (a) of this Section 7, and by the Company, in the case of parties
     indemnified pursuant to paragraph (b) of this Section 7. The indemnifying
     party shall not be liable for any settlement of any proceeding effected
     without its written consent, but if settled with such consent or if there
     be a final judgment for the plaintiff, the indemnifying party agrees to
     indemnify the indemnified party from and against any loss or liability by
     reason of such settlement or judgment. No indemnifying party shall, without
     the prior written consent of the indemnified party, effect any settlement
     of any pending or threatened proceeding in respect of which any indemnified
     party is or could have been a party and indemnity could have been sought
     hereunder by such indemnified party, unless such settlement includes an
     unconditional release of such indemnified party 

                                      20

 
     from all liability on claims that are the subject matter of such 
     proceeding.

          (d)  To the extent the indemnification provided for in paragraph (a)
     or (b) of this Section 7 is unavailable to an indemnified party or
     insufficient in respect of any losses, claims, damages or liabilities
     referred to therein, then each indemnifying party under such paragraph, in
     lieu of indemnifying such indemnified party thereunder, shall contribute to
     the amount paid or payable by such indemnified party as a result of such
     losses, claims, damages or liabilities (i) in such proportion as is
     appropriate to reflect the relative benefits received by the Company on the
     one hand and the Underwriters on the other hand from the offering of the
     Shares or (ii) if the allocation provided by clause (i) above is not
     permitted by applicable law, in such proportion as is appropriate to
     reflect not only the relative benefits referred to in clause (i) above but
     also the relative fault of the Company on the one hand and of the
     Underwriters on the other hand in connection with the statements or
     omissions that resulted in such losses, claims, damages or liabilities, as
     well as any other relevant equitable considerations. The relative benefits
     received by the Company on the one hand and the Underwriters on the other
     hand in connection with the offering of the Shares shall be deemed to be in
     the same respective proportions as the net proceeds from the offering of
     the Shares (before deducting expenses) received by the Company and the
     total underwriting discounts and commissions received by the Underwriters,
     in each case as set forth in the table on the cover of the Prospectus, bear
     to the aggregate Public Offering Price of the Shares. The relative fault of
     the Company on the one hand and the Underwriters on the other hand shall be
     determined by reference to, among other things, whether the untrue or
     alleged untrue statement of a material fact or the omission or alleged
     omission to state a material fact relates to information supplied by the
     Company or by the Underwriters and the parties' relative intent, knowledge,
     access to information and opportunity to correct or prevent such statement
     or omission. The Underwriters' respective obligations to contribute
     pursuant to this Section 7 are several in proportion to the respective
     number of Shares they have purchased hereunder, and not joint.

          (e)  The Company and the Underwriters agree that it would not be just
     or equitable if contribution pursuant to this Section 7 were determined by
     pro rata allocation (even if the Underwriters were treated as one entity
     --- ----
     for such purpose) or by any other method of allocation that does

                                      21

 
     not take account of the equity considerations referred to in paragraph (d)
     of this Section 7. The amount paid or payable by an indemnified party as a
     result of the losses, claims, damages and liabilities referred to in the
     immediately preceding paragraph shall be deemed to include, subject to the
     limitations set forth above, any legal or other expenses reasonably
     incurred by such indemnified party in connection with investigating or
     defending any such action or claim. Notwithstanding the provisions of this
     Section 7, no Underwriter shall be required to contribute any amount in
     excess of the amount by which the total price at which the Shares
     underwritten by it and distributed to the public were offered to the public
     exceeds the amount of any damages that such Underwriter has otherwise been
     required to pay by reason of such untrue or alleged untrue statement or
     omission or alleged omission. No person guilty of fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Securities
     Act) shall be entitled to contribution from any person who was not guilty
     of such fraudulent misrepresentation. The remedies provided for in this
     Section 7 are not exclusive and shall not limit any rights or remedies
     which may otherwise be available to any indemnified party at law or in
     equity.

          (f)  The indemnity and contribution provisions contained in this
     Section 7 and the representations, warranties and other statements of the
     Company contained in this Agreement shall remain operative and in full
     force and effect regardless of (i) any termination of this Agreement, (ii)
     any investigation made by or on behalf of any Underwriter or any person
     controlling any Underwriter or by or on behalf of the Company, its officers
     or directors or any person controlling the Company and (iii) acceptance of
     and payment for any of the Shares.

          8.   Termination.  This Agreement shall be subject to termination by
               ------------                                                   
notice given by you to the Company, if (a) after the execution and delivery of
this Agreement and prior to the Closing Date (i) trading generally shall have
been suspended or materially limited on or by, as the case may be, any of the
New York Stock Exchange, the American Stock Exchange or the National Association
of Securities Dealers, Inc., (ii) trading of any securities of the Company shall
have been suspended on any exchange or in any over-the-counter market, (iii) a
general moratorium on commercial banking activities in New York shall have been
declared by either Federal or New York State authorities or (iv) there shall
have occurred any outbreak or escalation of hostilities or any change in
financial markets or any calamity or crisis that, in your reasonable judgment,
is 

                                      22

 
material and adverse and (b) in the case of any of the events specified in
clauses (a)(i) through (iv), such event, singly or together with any other such
event, makes it, in your reasonable judgment, impracticable to market the Shares
on the terms and in the manner contemplated in the Prospectus.

          9.   Effectiveness; Defaulting Underwriters.  This Agreement shall
               ---------------------------------------                      
become effective upon the execution and delivery hereof by the parties hereto.

          If, on the Closing Date or the Option Closing Date, as the case may
be, any one or more of the Underwriters shall fail or refuse to purchase Shares
that it has or they have agreed to purchase hereunder on such date, and the
aggregate number of Shares which such defaulting Underwriter or Underwriters
agreed but failed or refused to purchase is not more than one-tenth of the
aggregate number of the Shares to be purchased on such date, the other
Underwriters shall be obligated severally in the proportions that the number of
Firm Shares set forth opposite their respective names in Schedule I bears to the
aggregate number of Firm Shares set forth opposite the names of all such non-
defaulting Underwriters, or in such other proportions as you may specify, to
purchase the Shares which such defaulting Underwriter or Underwriters agreed but
failed or refused to purchase on such date; provided that in no event shall the
                                            --------                           
number of Shares that any Underwriter has agreed to purchase pursuant to this
Agreement be increased pursuant to this Section 9 by an amount in excess of one-
ninth of such number of Shares without the written consent of such Underwriter.
If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to
purchase Firm Shares and the aggregate number of Firm Shares with respect to
which such default occurs is more than one-tenth of the aggregate number of Firm
Shares to be purchased, and arrangements satisfactory to you and the Company for
the purchase of such Firm Shares are not made within 36 hours after such
default, this Agreement shall terminate without liability on the part of any
non-defaulting Underwriter or the Company.  In any such case either you or the
Company shall have the right to postpone the Closing Date, but in no event for
longer than seven days, in order that the required changes, if any, in the
Registration Statement and in the Prospectus or in any other documents or
arrangements may be effected.  If, on the Option Closing Date, any Underwriter
or Underwriters shall fail or refuse to purchase Additional Shares and the
aggregate number of Additional Shares with respect to which such default occurs
is more than one-tenth of the aggregate number of Additional Shares to be

                                      23

 
purchased, the non-defaulting Underwriters shall have the option to (i)
terminate their obligation hereunder to purchase Additional Shares or (ii)
purchase not less than the number of Additional Shares that such non-defaulting
Underwriters would have been obligated to purchase in the absence of such
default. Any action taken under this paragraph shall not relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

          If this Agreement shall be terminated by the Underwriters, or any of
them, because of any failure or refusal on the part of the Company to comply
with the terms or to fulfill any of the conditions of this Agreement, or if for
any reason the Company shall be unable to perform its obligations under this
Agreement, the Company will reimburse the Underwriters or such Underwriters as
have so terminated this Agreement with respect to themselves, severally, for all
out-of-pocket expenses (including the fees and disbursements of their counsel)
reasonably incurred by such Underwriters in connection with this Agreement or
the offering contemplated hereunder.

          10.  Counterparts.  This Agreement may be signed in two or more
               -------------                                             
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

          11.  Applicable Law.  This Agreement shall be governed by and
               ---------------                                         
construed in accordance with the internal laws of the State of New York.

                                      24

 
          12.  Headings.  The headings of the sections of this Agreement have
               ---------                                                     
been inserted for convenience of reference only and shall not be deemed a part
of this Agreement.

                                     Very truly yours,

                                     Armstrong World Industries, Inc.



                                     By 
                                        -----------------------------
                                        Name:
                                        Title:



Accepted as of the date hereof
Morgan Stanley & Co. Incorporated
[NAMES OF OTHER CO-MANAGERS]

Acting severally on behalf
  of themselves and the
  several Underwriters named
  herein.

     By Morgan Stanley & Co.
          Incorporated



     By 
        ---------------------------
        Name:
        Title:

                                      25

 
                                   SCHEDULE I



                                                                   Number of
                                                                  Firm Shares
        Underwriter                                             To Be Purchased
        -----------                                             ---------------

Morgan Stanley & Co. Incorporated
[NAMES OF OTHER CO-MANAGERS]
[NAMES OF OTHER UNDERWRITERS]





                                                                
                                                                ---------------
                                                 Total ........
                                                                ===============


 
                                                                       Exhibit A
                                                                       ---------


                            [Form of Lock-Up Letter]



                                                                          , 1996
                                                             -------------


Morgan Stanley & Co. Incorporated
[NAMES OF OTHER CO-MANAGERS]
c/o Morgan Stanley & Co. Incorporated
1585 Broadway
New York, NY  10036

Dear Sirs and Mesdames:

          The undersigned understands that Morgan Stanley & Co. Incorporated
("Morgan Stanley") proposes to enter into an Underwriting Agreement (the
"Underwriting Agreement") with Armstrong World Industries, Inc., a Pennsylvania
corporation (the "Company"), providing for the public offering (the "Public
Offering") by the several Underwriters, including Morgan Stanley (the
"Underwriters"), of        shares (the "Shares") of the Common Stock (par value
                    -------
$1.00 per share) of the Company (the "Common Stock").

          To induce the Underwriters that may participate in the Public Offering
to continue their efforts in connection with the Public Offering, the
undersigned hereby agrees that, without the prior written consent of Morgan
Stanley on behalf of the Underwriters, it will not, during the period commencing
on the date hereof and ending [180] days after the date of the final prospectus
relating to the Public Offering (the "Prospectus"), (1) offer, pledge, sell,
contract to sell, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase, or
otherwise transfer or dispose of, directly or indirectly, any shares of Common
Stock or any securities convertible into or exercisable or exchangeable for
Common Stock (whether such shares or any such securities are now owned by the
undersigned or are hereafter acquired), or (2) enter into any swap or other
arrangement that transfers to another, in whole or in part, any of the economic
consequences of ownership of the Common Stock, whether any such transaction
described in clause (1) or (2) above is to be settled by delivery of Common
Stock or such other securities, in cash or otherwise.  The foregoing


 
sentence shall not apply to the sale of any Shares to the Underwriters pursuant
to the Underwriting Agreement.  In addition, the undersigned agrees that,
without the prior written consent of Morgan Stanley on behalf of the
Underwriters, it will not, during the period commencing on the date hereof and
ending [180] days after the date of the Prospectus, make any demand for or
exercise any right with respect to, the registration of any shares of Common
Stock or any security convertible into or exercisable or exchangeable for Common
Stock.

          Whether or not the Public Offering actually occurs depends on a number
of factors, including market conditions.  Any Public Offering will only be made
pursuant to an Underwriting Agreement, the terms of which are subject to
negotiation between the Company and the Underwriters.

                                                Very truly yours,

                                                
                                                -------------------------
                                                (Name)

                                                -------------------------
                                                (Address)