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Form of Proxy

This proxy is solicited by the management of
Masonite International Corporation(Masonite). The
undersigned shareholder of Masonite, revoking all proxies
previously given, hereby appoints Peter A. Crossgrove,
Chairman, or, failing him, Philip S. Orsino, or instead
of either of them the undersigned wishes to appoint




the attorney and proxy of the undersigned for and
in the name of and on behalf of the undersigned to attend, vote
and act in respect of all matters that may come before the
Annual Meeting of Shareholders to be held on May 3,
2004 and at any and all adjournments thereof.

A shareholder desiring to appoint some other
person, who need not be a shareholder, to represent him/her at
the meeting may do soby inserting
such other persons name in the blank space provided on
this form of proxy. The shares represented by this proxy will be
voted for or against or withheld from voting in accordance with
the instructions given herein.

This proxy confers authority to vote in the
proxyholders discretion unless otherwise specified and to
vote in the proxyholders discretion with respect to
amendments to matters identified in the accompanying Notice of
Annual Meeting of Shareholders and with respect to other matters
that may properly come before the meeting. Unless otherwise
specified, your shares will be voted by management of Masonite
FOR the matters below:

|                          |  |        |                                                                               |             |  |  |                                        | 
|------------------------- |  | ------ | ----------------------------------------------------------------------------- | ----------- |  |  | -------------------------------------- | 
|THE ELECTION OF DIRECTORS |  | FOR  o |                                                                               | WITHHOLD  o
|                          |  |        | all nominees listed below
    (except as indicated
    to the contrary below) |             |  |  | from all
    nominees
    listed below | 

|                                                       |  |                                                                |  |                                                         
|------------------------------------------------------ |  | -------------------------------------------------------------- |  | --------------------------------------------------------
|Howard L. Beck
    John J. Berton
    John M. Cassaday |  | Peter A. Crossgrove
    Fredrik S. Eaton
    Alan R. McFarland |  | Philip S. Orsino
    Joseph L. Rotman
    Saul M. Spears

To withhold authority to vote for any individual
nominee please write that nominees name(s) on the line
below:




|                            |  |        |  |            
|--------------------------- |  | ------ |  | -----------
|THE APPOINTMENT OF AUDITORS |  | FOR  o |  | WITHHOLD  o

Note: If not dated below, this proxy is deemed
to be dated on the day sent by Masonite. If a corporation is the
shareholder, this form of proxy should be signed under its
corporate seal or by its duly authorized officer(s). Executors,
administrators, trustees, attorneys or guardians should so
indicate when signing and provide proof of appointment. Where
the shares are held in the name of two or more persons, each
person must sign.

|     |  |                        
|---- |  | -----------------------
|    
|     |  |                        
|Date |  | Shareholders Signature

PLEASE COMPLETE AND RETURN IN THE ENVELOPE
PROVIDED OR FAX TO

COMPUTERSHARE TRUST COMPANY OF CANADA AT
(416) 981-9803.