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CERTIFICATION I, Philip S. Orsino, certify that: 1. I have reviewed this annual report on Form 40-F of Masonite International
Corporation; 2. Based on my knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this annual
report; 3. Based on my knowledge, the financial statements, and other financial
information included in this annual report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
Registrant as of, and for, the periods presented in this annual report; 4. The Registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Registrant and have: a) designed
such disclosure controls and procedures or caused such disclosure
controls and procedures to be designed under our supervision, to ensure that
material information relating to the Registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this annual report is
being prepared; b) evaluated the effectiveness of the Registrants disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the
end of the period covered by this report based on such evaluation; and c) disclosed
in this report any change in the issuer's internal control over
financial reporting that occurred during the period covered by the
annual report that has materially affected, or is reasonably likely
to materially affect, the issuers internal control over financial
reporting; and 5. The Registrants other certifying officer and I have disclosed, based on our
most recent evaluation of internal control over financial reporting,
to the Registrants auditors and the audit committee of the
Registrants board of directors (or persons performing the equivalent
function): a) all
significant deficiencies and material weaknesses in the design or operation of internal
control over financial reporting which are reasonably likely to adversely affect the Registrants ability to record,
process, summarize and report financial information; and b) any fraud, whether or not material, that involves management or other
employees who have a significant role in the Registrants internal
control over financial reporting. Dated: May 14, 2004. /s/ Philip S. Orsino




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CERTIFICATION I, Robert V. Tubbesing, certify that: 1. I have reviewed this annual report on Form 40-F of Masonite International
Corporation; 2. Based on my knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this annual
report; 3. Based on my knowledge, the financial statements, and other financial
information included in this annual report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
Registrant as of, and for, the periods presented in this annual report; 4. The Registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Registrant and have: a) designed
such disclosure controls and procedures or caused such disclosure
controls and procedures to be designed under our supervision, to ensure that
material information relating to the Registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this annual report is
being prepared; b) evaluated the effectiveness of the Registrants disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the
end of the period covered by this report based on such evaluation; and c) disclosed
in this report any change in the issuer's internal control over
financial reporting that occurred during the period covered by the
annual report that has materially affected, or is reasonably likely
to materially affect, the issuers internal control over financial
reporting; and 5. The Registrants other certifying officer and I have disclosed, based on our
most recent evaluation of internal control over financial reporting,
to the Registrants auditors and the audit committee of the
Registrants board of directors (or persons performing the equivalent
function): a) all
significant deficiencies and material weaknesses in the design or operation of internal
control over financial reporting which are reasonably likely to adversely affect the Registrants ability to record,
process, summarize and report financial information; and b) any fraud, whether or not material, that involves management or other
employees who have a significant role in the Registrants internal
control over financial reporting. Dated: May 14, 2004. /s/ Robert V. Tubbesing