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Old 08-16-2012, 07:55 PM   #1
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Drywall to Backer Board Joint


Hello, Im back again with another SIMPLE question that cant find the answer to...

My shower ceiling is drywall (mildew resistant kind) and the walls are all cement board.

How do I finish the joint from wall to ceiling? Do i use a drywall joint mud or do I use thin set? OR do i use both, thinset on cement board and drywall mud on drywall?

I need help...!?
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Old 08-16-2012, 08:03 PM   #2
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Drywall to Backer Board Joint


Drywall mud should work fine, it's going to get covered with tile and it's high enought to not matter. And it's easer to sand drywall compound.
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Old 08-16-2012, 08:07 PM   #3
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Drywall to Backer Board Joint


Thanks Joe,

Do i need to worry about the drywall mu cracking due to contraction and expansion issues? I was told to caulk using a latex with silicone caulk to all corner joints within the shower. Any knowledge on that?
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Old 08-16-2012, 08:16 PM   #4
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Drywall to Backer Board Joint


That's right, any place it meets at an angle or is close to a differant material, caulk it.
Such as where the tile meets the ceiling, top of tub, base of tub.
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Old 08-21-2012, 10:11 AM   #5
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Drywall to Backer Board Joint


You don't need to use anything at that joint because you're going to tile right up the edge, and then you're going to caulk the crack/joint that's left with an acrylic caulk that matches your grout (sanded caulk if your grout is sanded).
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