New answers tagged mortar
You don't tape the edges. Not on walls or tub. I'm not sure about a 1/4 inch gap by tub (probably would do 1/8 there) be everywhere else is fine. Nothing goes in the gap. Gap will be covered by either tile on the wall or baseboard. Also make sure you are using the right mesh "tape". Your cement board gets same thinset as your tile .
Tape the seams if your going to use pro-red or its equivalent (highly suggested). If the manufacture says to leave an expansion gap, that's what you do; leave a gap. I must admit, that where it meets the walls, I wouldn't. Any expansion would buckle the tape and bubble the paint. I'd rather the whole wall shift a little. Also, the only place for caulk in a ...
The cement board must be properly backed at tub edge to keep it stiff. The gap between it and the tub is grout filled. I don't tape corners. I do tape bevels simply to make a flush surface for the tiles. I generally silicon tiled corners. I use 1/8 inch gap and that give me more room for silicon on the corners. That's enough room. The idea is to avoid ...
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