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Less than a year ago I had several rooms tiled with a beautiful ceramic tile. Now the grout is cracking, the tiles are loose and I can't get the contractor to come back. (Don't even go there with me ) I have begun pulling up the loose tiles and have the motar to contend with below. How best do I prepare the wood subfloor for this tile to be reinstalled? Any suggestions would be greatly appreciated.
AC is correct, over the long haul the floor will continue to fail but we understand your need to try and patch for now. Ceramic on a wood sub floor requires modified thinset, find it in the tile aisle.
At this point, I would use a grout remover tool (sold at Home depot or Lowe's) and scrape the grout from the loose tiles. I would just glue or use the modified thin set and relay the ones that came up. Then re-grout and fade it in with the ones that I left.
Since money is an issue, this would get you by for a while. Later, you'll probably need to pull it all up.
I feel your pain. I absolutely refuse to allow anyone to work on anything of mine if I can. I have found that my life time of construction experience gave me more knowledge of many things over the experts. I NEVER put oil in a master cylinder by mistake, or did some of the stupid things I have seen done. I learned to repair compressors after getting them back from the repair shop with the valve heads installed backwards. The only trustworthy person you know is YOU.