Exhibit 99.1


                    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
March 30, 2003 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:  May 12, 2003






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

Date:  May 12, 2003



A signed original of this written statement required by Section 906 has been
provided to Building Materials Corporation of America and will be retained by
Building Materials Corporation of America and furnished to the Securities and
Exchange Commission or its staff upon request.

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.