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SeattleP
Portion of shower wall down, how do I waterproof?
SeattleP

My home was re-piped and a portion of the shower wall had to be demolished for access. So far both contractors i've had in for bids state that the rest of the wall need to come down in order for them to re-tile the wall. I don't believe that should be the case but I'm not sure how to do it myself. How can I be sure this section is waterproofed properly if I use backerboard and re-tile on my own? All of the instructions I find ****** show a fully demolished wall, not just part of the wall.
My main concern is the seals in the corner and down near the tub.

A. Spruce
Re: Portion of shower wall down, how do I waterproof?
A. Spruce

If you are referring to a portion of the wall still having tile on it, the contractors are right, all tile off the wall and start over. If no tile on the wall and just a portion of the drywall needs repair, then no, fix the drywall and go forward.

The reason you can't patch tile into a wall is what's known as a "cold" joint. A cold joint is anytime new cement based products (grout, mortar, thinset ) touches existing cement based product (old grout, mortar, . . . ). These two do not bond together, a crack will always remain, and in a shower, that means you will have a leak. Strip the wall bare of tile, and start over.

But what about the corners, you might ask? Whenever you have a change in direction, this is a natural cracking point, and it is sealed with caulking, so it doesn't matter if you've got a cold joint in a corner, but you do not want one in the middle of a wall.

dj1
Re: Portion of shower wall down, how do I waterproof?
dj1

If a tile man tells you he can finish the ripped section without removing the rest, don't hire him.

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