Exhibit 99.1

Certification of CEO 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 Annual Report on Form 10-K of Building Materials Corporation of America (the “Company”) for the fiscal year ended December 31, 2002 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, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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:		March 26, 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 § 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 §18 of the Securities Exchange Act of 1934, as amended.