(1) Is the best thing to do here to rip everything out, and apply a bleach solution to the block? (2) Should I use any sort of sealer on the cinderblock and/or any sort of vapor barrier (Central FL)? (3) When I finally put the backberboard on, should I just do 2 layers of the cement board, or should I do drywall on the cinderblock, and cement board on top of that for the shower wall? I don't really care about cost, I'd like the most waterproof/solid solution. There appear to be two layers of drywall on this wall, and then it's straight against the cinderblock frame. There's spotting throughout, and the drywall (builder did not use cement board) just crumbles. Install cement board with the grid facing out in front of you. The more I removed, the more obvious there was a moisture issue here (musty smell too). The thinset on the back looked black, and the paper was separating from the drywall. Maintain joints between 3/8 and 3/4 from the edges of the board and 2. I started removing tiles from this wall and noticed they were coming up extremely easy from the section under the window. People also ask: Can you use both sides of the Hardie board/2 Hardi can be installed either way, but the rough side is labeled as this is the intended back, regardless of whether you’re using a thin set or putty. The exterior wall has a "window" in it, made out of glass blocks, so it's inset about 6". The way the shower is laid out is, if you're standing in it facing the showerhead, there's a wall to your left which is an exterior wall, and an interior wall behind you.
I decided to re-tile my shower as I've been making minor repairs to the grout for the last couple years since purchasing the home, and I figured it was time to tear it down and start fresh.
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