DIYbanter - View Single Post

wrote:
I will try to be more specific about problem. These are 6x8 " tiles
installed on new primed 1/2" plywood on 16" studs above the new tub.
Corners are caulked. There are hairline cracks about 25% of the area.
I noticed these about a month or two after job was done. (about 2
years) Have never used the shower because of the cracks. I maybe could
spray silicone sealer on the walls but don't want to take a chance.
Wondering what I should do.

Wrong from the start. Either use mortar, a cementious backerboard, or
Hardibacker for a substrate. With plywood, all bets are off. Plywood
is not receommended for tile substrates in showers or baths, ever. Your
problems will only increase once you start using the shower. Who
advised this to you? I'd string them up from a telephone pole.

Rip it out, start over. Sorry.