[shorteared]

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...!?

[joecaption]

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.

[shorteared]

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?

[joecaption]

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.

[jeffnc]

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).