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Originally Posted by boneheaddoctor
what did you use as a backer to the tile....greenboard or cement board? Were they properly grouted? What tile gap and did you use sanded or unsanded grout. Like many things the foundation is key to a long lasting job. Shwer stall floors must have a membrane propperly installed. Is you froblem with the floor or the wall, I didn't see that in the post.
Regular sheet rock will not hold up long in a shower even with a proper tile job.
I did my two bathrooms 7 years ago and used ceramic tile over cement board, using thinset not mastic. Never had any problems on either the floor or walls.
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It's the floor which is 75yr old concrete. Shower walls are some kind of solid stone also 75 yrs old. I think it was sanded grout, but it was a yr ago so I can't be sure. It was the most expensive pre-mixed grout at HD at the time.
It's definitely a problem with the mastic because besides the ones that popped up, I can get the ones still in place to move slightly, as if they are set in rubber, when I pry on them. The ones directly underfoot when taking a shower are the ones that came up.
The irony is that I chose the pre-mixed mastic and grout because I thought, as an amateur, it was possible I would mix the non-premixed stuff wrongly.