My question is regarding how far down you take the cement board and tiles over the tub flange.
The product I’m using is called WEDI, which is a cement covered foam board. It’s chief advantage is that it is waterproof at the cement surface. Water isn’t absorbed into the closed cell foam. Since it’s foam, you can hog out the bottom edge to fit over the tub flange. What I would like to know is where do I stop? Here is a picture of my question:
I’d like to know if the bottom edge should be 1/4″ off the tub top, 1/8″, or if I should bring the edge right down to the tub top?
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
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Replies
I would go at least 1/4", more like 3/16" above the top of the tub.
By going 3/16" up you can run your bottom row of tiles 1/8" up and not worry about the backer board showing.
You will want a minimum of 1/8" gap between the tub and the tile so there is room for a a 'good' bead of caulk. Too thin a bead of caulk can 'let' go if it is stretched.
Let's not confuse the issue with facts!
I like 1/8 - 1/4... with most cement board, that's the best I can score and snap.
In other words, just enough to break the surface tension of water between the two surfaces for both backer and tile.
In other other words, I really dont' know about that backer and you're on your own if the manu or somone else here doesn't give guidance.
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Paul
If the tub is on the second floor, make sure you nail a 2 X 4 ledger on the wall to hold the rim of the tub. It keeps the tile to tub joint from opening up.
If it is on the 1st floor slab, forget it.