Exhibit 32.1


                    CERTIFICATION OF CEO AND CFO PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



         In connection with the Quarterly Report on Form 10-Q of Building
Materials Corporation of America (the "Company") for the quarterly period ended
October 3, 2004 as filed with the Securities and Exchange Commission on the date
hereof (the "Report"), William W. Collins, as Chief Executive Officer and
President of the Company, and John F. Rebele, as Senior Vice President and Chief
Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of
2002, that, to the best of his knowledge and belief:


          (1)  The Report fully complies with the requirements of Section 13(a)
               or 15(d) of the Securities Exchange Act of 1934; and

          (2)  The information contained in the Report fairly presents, in all
               material respects, the financial condition and results of
               operations of the Company.


   /s/ William W. Collins
- --------------------------------------------
Name:  William W. Collins
Title: Chief Executive Officer and President

Date:  November 17, 2004



   /s/ John F. Rebele
- --------------------------------------------
Name:   John F. Rebele
Title:  Senior Vice President and
        Chief Financial Officer

Date:  November 17, 2004


         This certification accompanies the Report pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by
the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of
Section 18 of the Securities Exchange Act of 1934, as amended.