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Unread 09-19-2020, 08:41 AM   #1
Daniel1018
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Kerdi-Board and Cement Board

I am a DIYr working on a shower. I ran into an issue and need some advice.

I ran into a block wall. The drywall was on 5/8' strips. I can't attache the kerdi board to the strips. I saw that you can use thin set to bond Kerdi board to mansory wall. Can I attache 5/8 durack or cement boars to the wall. And then use thinset to bond the kerdi board to the cement board?
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Unread 09-19-2020, 11:21 AM   #2
cx
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Welcome, Dan.

I'm confused as to why you'd wanna do that.

Why would you not attach the KerdiBoard to the furring strips? Or remove the furring strips and attach the KerdiBoard directly to the block wall?
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Unread 09-19-2020, 04:54 PM   #3
Daniel1018
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The strips are only 5/8 and the kerdi screws are over an inch. If I but the kerdi directly to the wall. Than it will be un even with the rest of the walls.
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Unread 09-19-2020, 08:00 PM   #4
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Understand. Why not just find some shorter screws with which to fasten the KerdiBoard to the existing furring strips?

I think you'll not find a CBU manufacturer who will tell you to just bond your CBU to the block wall, but I suppose you could try it if you like. The cost of a failure after the shower is completed will be pretty high, though.

If you're really locked into the KerdiBoard, you could buy some thicker sections for that wall and bond it directly to the block wall.

Or you could put the drywall back on that wall and use Kerdi membrane over it in lieu of the KerdiBoard.

Any options that leave you with walls in different planes could be dealt with in a number of ways, too. Without any photos of what you're dealing with it's difficult to suggest anything else.

My opinion; worth price charged.
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