Haven't used UFH since April and just turned it back on for 2 hours last night. Everything seemed to working fine but this morning, when you walked on two tiles porcelain tiles in the hallway they made a sticky sound as if the adhesive was loosening.
They settled back into place after I stood on them - any ideas as to what's happened? Too much heat too soon?
I'd be surprised if the heat in the floor had anything to do with it but check the temp of the water in the screed. Usually 30 to 40 degrees. I'm sure adhesive doesn't soften - the tile may have come away from the screed because of a weak bond.