EXHIBIT 3.23

                          CERTIFICATE OF INCORPORATION

                                       OF

                          BMCA Acquisition Corporation

                     ---------------------------------------




                THE  UNDERSIGNED,  being a natural  person for the  purposes  of
organizing  a  corporation  under the  General  Corporation  Law of the State of
Delaware, hereby certifies that:

                FIRST:  The  name  of  the  Corporation  is   BMCA   Acquisition
Corporation.

                SECOND:  The address of the registered office of the Corporation
in the  State  of  Delaware  is  2711  Centerville  Road,  Suite  400,  City  of
Wilmington,  County of New  Castle,  State of  Delaware  19808.  The name of the
registered  agent of the Corporation in the State of Delaware at such address is
Corporation Service Company.

                THIRD: The purpose of the Corporation is to engage in any lawful
act or  activity  for which  corporations  may be  organized  under the  General
Corporation Law of the State of Delaware, as from time to time amended.

                FOURTH:  The total  number of shares of capital  stock which the
Corporation shall have authority to issue is 1,000, all of which shares shall be
Common Stock having a par value of $.001.

                FIFTH:  The name and  mailing  address  of the  incorporator  is
Shelley A. Sorkin,  c/o Building  Materials  Corporation  of America,  1361 Alps
Road, Wayne, New Jersey 07470.

                SIXTH:  In  furtherance  and  not in  limitation  of the  powers
conferred  by law,  subject  to any  limitations  contained  elsewhere  in these
articles of incorporation, By-laws of the Corporation may be adopted, amended or
repealed by a majority of the board of  directors  of the  Corporation,  but any
By-laws  adopted by the board of  directors  may be amended or  repealed  by the
stockholders  entitled to vote  thereon.  Election of  directors  need not be by
written ballot.

                SEVENTH:  (a)  A  director  of  the  Corporation  shall  not  be
personally  liable either to the  Corporation or to any stockholder for monetary
damages for breach of fiduciary duty as a director, except (i) for any breach of
the director's duty of loyalty to the Corporation or its  stockholders,  or (ii)
for acts or omissions  which are not in good faith or which involve  intentional
misconduct  or knowing  violation of the law, or (iii) for any matter in respect
of which  such  director  shall be liable  under  Section  174 of Title 8 of the
General  Corporation  Law of the State of Delaware or any  amendment  thereto or
successor provision thereto, or (iv) for any transaction from which the director
shall have derived an improper personal benefit. Neither amendment nor repeal of
this  paragraph  (a) nor the  adoption of any  provision of the  Certificate  of
Incorporation inconsistent with this paragraph (a) shall eliminate or reduce the
effect of this paragraph (a) in respect of any matter occurring, or any cause of
action,  suit or claim that, but for this  paragraph (a) of this Article,  would
accrue or arise, prior to such amendment,  repeal or adoption of an inconsistent
provision.





                (b) The  Corporation  shall indemnify any person who was or is a
party or is threatened  to be made a party to, or testifies in, any  threatened,
pending or  completed  action,  suit or  proceeding,  whether  civil,  criminal,
administrative  or  investigative  in  nature,  by  reason of the fact that such
person is or was a director,  officer, employee or agent of the Corporation,  or
is or was serving at the  request of the  Corporation  as a  director,  officer,
employee or agent of another corporation,  partnership,  joint venture, employee
benefit plan, trust or other enterprise,  against expenses (including attorneys'
fees),  judgments,  fines and amounts paid in settlement actually and reasonably
incurred by such person in  connection  with such action,  suit or proceeding to
the full extent permitted by law, and the Corporation may adopt By-laws or enter
into  agreements  with any such  person for the  purpose of  providing  for such
indemnification.

                IN WITNESS  WHEREOF,  the  undersigned  has duly  executed  this
Certificate of Incorporation on this 9th day of March, 2004.

                                                          /s/ Shelley A. Sorkin
                                                          ----------------------

                                                          Shelley A. Sorkin
                                                          Sole Incorporator





                            CERTIFICATE OF AMENDMENT
                                     OF THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                          BMCA ACQUISITION CORPORATION

                         ADOPTED IN ACCORDANCE WITH THE
                        PROVISIONS OF SECTION 242 OF THE
                        DELAWARE GENERAL CORPORATION LAW

                It is hereby certified that:

        1.      The present name of the corporation (the  "Corporation") is BMCA
                Acquisition Corporation.

        2.      The  Certificate of  Incorporation  of the Corporation was filed
                with the Secretary of State of Delaware on March 9, 2004.

        3.      Article  First  of  the  Certificate  of  Incorporation  of  the
                Corporation  is  hereby  amended  to  read  in its  entirety  as
                follows:

                "The   name  of  the   corporation   (hereinafter   called   the
                "Corporation") is BMCA Quakertown Inc."

        4.      The foregoing  amendment was declared  advisable by a resolution
                duly adopted by unanimous  written  consent of the  directors of
                the  Corporation  dated April 20,  2004 and was duly  adopted in
                accordance  with the  provisions  of Section 242 of the Delaware
                General  Corporation  Law by the  affirmative  vote of the  sole
                stockholder of the Corporation.

                IN WITNESS WHEREOF,  the Corporation has caused this Certificate
to be signed  by Roger F.  Assad,  its Vice  President  - Law,  this 20th day of
April, 2004.

                           BMCA ACQUISITION CORPORATION

                         By: /s/ Roger F. Assad
                            -------------------------------------------------
                            Roger F. Assad
                            Vice President - Law