Classic case of father-in-law showing me the ropes, but not telling me you can't push a rope... I laid ceramic tile in my bathroom on a wood subfloor with backer board and Master Blend standard thin set. Floor spans are small but there seems to be some movement or the wrong thin set application. I know now we did a few things wrong, one of which is that that backer board was butted up tight...Get to the chase...My grout cracked after a few months and I noticed a loose tile. To my surprise I was able to pry up a full 12x12 with my fingers, no adhearance of the thin set to the tile at all! Sadly I continued to be able to do this tile over tile. :wall: Couple of questions: 1. How do I get the old thin set off the backer board without destroying the backer board? 2. Should I have added a flex additive to the thin set? My ingnorance abbounds on this subject, I'd really appreciate any assistance. I've read quite a few of the responses on other issues and have learned a lot already. Waiting with bated breath...

my tile installer just finished installing 20x20 glazed porcelain tiles in my kitchen. He did a beautiful job--until he pushed the fridge back and scratched (lightly but noticeably) several tiles. Clearly he didn't notice. The scratches aren't deep; looks like the glaze was rubbed off. My question is: can these scratches be repaired--buffed out or something? Or will the tiles have to be replaced? And how difficult is that if he just laid the tiles in the last couple of days? thanks for any advice.