EXHIBIT 99.a

STATEMENT UNDER OATH OF THE PRINCIPAL EXECUTIVE OFFICER OF MASCO CORPORATION
REGARDING FACTS AND CIRCUMSTANCES RELATING TO EXCHANGE ACT FILINGS

I, Richard A. Manoogian, state and attest that:

(1)      To the best of my knowledge, based upon a review of the covered reports
         of Masco Corporation, and, except as corrected or supplemented in a
         subsequent covered report:

         -    no covered report contained an untrue statement of a material fact
              as of the end of the period covered by such report (or in the case
              of a report on Form 8-K or definitive proxy materials, as of the
              date on which it was filed); and

         -    no covered report omitted to state a material fact necessary to
              make the statements in the covered report, in light of the
              circumstances under which they were made, not misleading as of the
              end of the period covered by such report (or in the case of a
              report on Form 8-K or definitive proxy materials, as of the date
              on which it was filed).

(2)      I have reviewed the contents of this statement with Masco Corporation's
         audit committee;

(3)      In this statement under oath, each of the following, if filed on or
         before the date of this statement, is a "covered report":

         -        Annual Report on Form 10-K dated March 28, 2002 for the fiscal
                  year ended December 31, 2001;

         -        all reports on Form 10-Q, all reports on Form 8-K and all
                  definitive proxy materials of Masco Corporation filed with the
                  Commission subsequent to the filing of the Form 10-K
                  identified above; and

         -        any amendments to any of the foregoing.


/s/Richard A. Manoogian                              Subscribed and sworn to
------------------------                             before me this 30th day of
Richard A. Manoogian                                 July 2002.


Dated:   July 30, 2002
                                                     /s/Terry L. Przybylo
                                                     ---------------------------
                                                     Notary Public


                                                     My Commission Expires:

                                                     August 2, 2003
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