1
                                                                    EXHIBIT 3.13
                          CERTIFICATE OF INCORPORATION

                                       OF

                         MODERN WINDOW ACQUISITION CORP.

         FIRST: The name of the Corporation is MODERN WINDOW ACQUISITION CORP.

         SECOND: The address of the registered office of the Corporation in the
State of Delaware is Corporation Trust Center, 1209 Orange Street, Wilmington,
County of New Castle. The name of its registered agent at that address is The
Corporation Trust Company.

         THIRD: The purpose of the Corporation is to engage in and to do any
lawful act or activity for which corporations may be organized under the General
Corporation Law of Delaware.

         FOURTH: The total number of shares of stock which the Corporation shall
have authority to issue is one hundred thousand (100,000) shares of common
stock, par value $.01 per share.

         FIFTH: The name and mailing address of the Incorporator of the
Corporation is as follows:

NAME                                                 MAILING ADDRESS

AAP Holdings, Inc.                                812 Huron Road, East, No. 880
                                                  Cleveland, Ohio 44115-1126

         SIXTH: The following provisions are inserted for the management of the
business and the conduct of the affairs of the Corporation, and for further
definition, limitation and regulation of the powers of the Corporation and of
its directors and stockholders.

         (1) The directors shall have concurrent power with the stockholders to
make, alter, amend, change, add to or repeal the By-Laws of the Corporation.

         (2) The number of directors of the Corporation shall be as from time to
time fixed by, or in the manner provided in, the By-Laws of the Corporation.
Election of directors need not be by written ballot unless the By-Laws so
provide.

         SEVENTH: Meetings of stockholders may be held within or without the
State of Delaware, as the By-Laws may provide. The books of the Corporation may
be kept (subject to any provision contained in the statutes) outside the State
of Delaware at such place or



   2
places as may be designated from time to time by the Board of Directors or in
the By-Laws of the Corporation.

         EIGHTH: The liability of directors of the Corporation is hereby
eliminated to the full extent permitted by Section 102(b)(7) of the Delaware
General Corporation Law or any successor provisions.

         THE UNDERSIGNED, being the incorporator hereinbefore named, for the
purpose of forming a corporation pursuant to the General Corporation Law of the
State of Delaware, does make this Certificate, hereby declaring and certifying
that this is its act and deed and the facts herein stated are true, and
accordingly has caused to be set hereunder its hand this 6th day of August,
1997.


                                       AAP HOLDINGS, INC.



                                       By:/s/ Tracey Stockton
                                          ----------------------------------
                                              Tracey Stockton
                                              Assistant Secretary


                                        2