We are having a problem with the floor tiles we installed in our kitchen and dining room. Twice now, a section of 6 - 8 tiles "buckle". The grout cracks and that tile section raises about a half inch off the concrete floor. It happened about 8 months ago, and we replaced the tiles and regrouted, but now it has happened again in a different part of the room. We have no idea why. Any suggestions?
I am assuming the tiles are ceramic. If the are actually buckling the is something moving! I would not expect the tiles would buckle without the concrete showing some cracking or something. When the tiles were removed and the floor cleared did any cracking show? My guess is they thin set or adhesive use to lay the tiles bond if failing for one reason or another. the grout then is the only thing hold the tile. It starts to break apart and gets caught under the tiles and hold them up. How long has it been down? has it ever flooded? What type of adhesive did you use? Is the floor solid concrete or just a leveling coat over the area? And obviously is their anything that might be forcing those rows.