Exhibit 99.6

                            CERTIFICATION 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 filing of the Quarterly Report of Headwaters Incorporated
(the "Company") on Form 10-Q for the period ended March 31, 2003 (the "Report"),
I, Steven G. Stewart, Chief Financial Officer of the Company, certify, pursuant
to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act
of 2002, that:

         (i)      The Report fully complies with the requirements of section
                  13(a) of the Securities Exchange Act of 1934; and

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

/s/ Steven G. Stewart
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Steven G. Stewart
Chief Financial Officer
May 7, 2003


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