24 year old tile over cement slab floor failing-tenting and popping up

[TLovelace]

I very much doubt it's a structural issue. Youd see other issues to accompany it so I reckon you can put that out of your mind safely

Thermal shock due to the temperature change would probably do it especially if its underfloor heating. Specially if the heating was turned on at a high temperature relative to the ambient temperature of the slab. When turning on the heating aftercare cold spell its always a good idea to treat it as if it's the first time and turn it on slowly. Given there was some moisture that might also have played a part in that the adhesive or primer may have been weakened due to dampness. It's possible that there are not sufficient movement joints in the tile face

I should have been more specific, it is central heat, not under the tile. Florida is generally tropical. Climate change has caused some cooler temperatures that we usually see. I'm away for about a month, it will be interesting to see what changed in my absence. One other thing, the grout by and large was holding well. A few areas where it's crumbles at an intersection. Thank you for your input about the structural component. There are many things I'd rather deal with than that.

 

[Zack Mc]

TLovelace, what was the outcome of this? Did you find out what caused it? I have a similar issue with some tile on my house. No issues in 9 years then it started tenting is the middle of a large room.