We recently had underfloor heating installed in the bathroom (Wiring)?

Question

My husband did the floor tiling using the correct adhesive, thickness etc, but some of the tiles keep lifting and the cement will not dry out evenly. After two attempts and lots of expense we are at a loss as to why this is happening. It occured to me that the person who installed the heating perhaps ought to have laid it with matting over the top of it.

The installer says not, but what else could be the cause of the cement not drying on some of the tiles. Some have dried out perfectly well and are fixed others are not.

The concrete floor has the correct screen and was not damp prior to laying the tiles. Does anyone have any ideas please? Before we both go loco.

Answer 1

I'm not sure if the cement is the problem. Perhaps he did not use enough to actually in-bed the tile into the floor. If the tiles keep popping up in some areas and not others, you know the cement is fine. Try to spread the cement on the tile and then lay it in place. I know from experience that not all tile pieces sit properly. Some are off even if they seem perfectly flat. I'm sorry I don't have a miracle answer. We did our bathroom tiles and not all accepted the same amount of cement. Some needed to be wiggled in, others didn't. Don't go crazy yet, you will find the answer. Good luck and Merry X-mas.

Answer 2

What do you mean by 'cement not drying on some of the tiles' ? You should have used flexible tile adhesive and should have used bonding/primer on the concrete floor before laying the element. 'Anything' would have dried out in a week or so, if you have moisture present then there must be a leaking pipe somewhere??!

Answer 3

Did he use the correct cement? I say this, because my husband didn't. He should have used a flexible cement. We've had to redo it.