Ceramic tile not adhering.....HELP
The guy you hired should have known better than that. I lay tile for a living,,,, and in all honesty,, I have never heard of anything like this ever happening. My suggestion is to take the guy you hired for a loop through the system and get your problem fixed. There needs to be
3/4 plywood glued down to the floor joist, then thinset on the plywood, backerboard, thinset on the backerboard, then the tile and grout. No offense to anybody, but i think it's pathetic that this is the kinda compitition that the "Experienced" has to compete with.