EXHIBIT 32.1

                           SECTION 1350 CERTIFICATIONS

In connection with the Annual Report of USG Corporation (the "Corporation") on
Form 10-K, as filed with the Securities and Exchange Commission on the date
hereof (the "Report"), I, William C. Foote, Chairman and Chief Executive Officer
of the Corporation, certify, 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
my knowledge:

(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
     Corporation.


February 16, 2007                       /s/ William C. Foote
                                        ----------------------------------------
                                        William C. Foote
                                        Chairman and Chief Executive Officer