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Old 05-21-2011, 09:35 PM   #1
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What is the proper way to cut CBU around windows


I've been reading and searching and still can't figure out the best way to go about putting cbu around my window.

I was wondering what is the proper procedure to cut CBU/Durock around windows opening. The windows size is 3x3 feet, and the wall size is 4'4" wide x 8' tall.

Should I cut 2 3x5 board of CBU in half and install it vertically. This will leave a joint in the middle top/bottom of the windows and no joints in the corners.

Should I install the board horizzontally . This will create a joint on both middle sides of the windows.

Or should just cut the CBU to fit propery on the sides, top, bottom. This will leave joint in the 4 corners.

I'm aware of proper installation of drywall (use a full sheet and fit the windows inside the drywall), but cant find any info on internet for cbu .

Note: the window is in a dry area.

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Old 05-21-2011, 10:32 PM   #2
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What is the proper way to cut CBU around windows


Treat it the same as drywall--avoid seams in corners of the window---

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Old 05-22-2011, 07:27 AM   #3
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What is the proper way to cut CBU around windows


If the window is in a dry area, why the cement board?
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