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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549




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FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934

|                              |  |                             
|----------------------------- |  | ----------------------------
|For the month of: April, 2004 |  | Commission File No.: 1-11796

MASONITE INTERNATIONAL CORPORATION

(Name of registrant)


1600 Britannia Road East
Mississauga, Ontario
L4W 1J2

(Address of Principal Executive Offices)

PREMDOR INC.(Former Name of Registrant)

Indicate by check mark whether the registrant files or will file annual reports
under cover of Form 20-F or Form 40-F:

|            |  |            
|----------- |  | -----------
|Form 20-F o |  | Form 40-F x

Indicate by check mark if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(1):

|      |  |     
|----- |  | ----
|Yes o |  | No x

Indicate by check mark if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(7):

|      |  |     
|----- |  | ----
|Yes o |  | No x

Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934:

|      |  |     
|----- |  | ----
|Yes o |  | No x

If Yes is marked, indicate the file number assigned to the registrant in
connection with Rule 12g3-2(b): N/A





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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

|                    |  |  |     |                                                                                     
|------------------- |  |  | --- | ------------------------------------------------------------------------------------
|                    |  |  |     | MASONITE INTERNATIONAL CORPORATION                                                  
|                   
|Date: April 6, 2004 |  |  |     |                                                                                     
|                   
|                    |  |  | By: | /s/ Harley Ulster
Name:  Harley Ulster
Title: Executive Vice-President
and Secretary





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EXHIBIT INDEX

|        |  |                                                                                                        
|------- |  | -------------------------------------------------------------------------------------------------------
|Exhibit |  | Description of Exhibit                                                                                 
|        |  |                                                                                                        
|99.1    |  | Notice of Annual Meeting of Shareholders to be held on
May 3, 2004 with Management Information Circular
|       
|99.2    |  | Form of Proxy                                                                                          
|       
|99.3    |  | Interim Report Request Form