It appears that our builders have laid ceramic tiles directly on floorboards in our hallway and downstairs toilet without any backing etc.
It was fine for the first couple of months, but it seems to have caused 1 tile to crack and the grouting around another to perish. When you stand on that tile the whole tile depresses by a few millimetres. When you walk over the whole area it doesn't feel particularly 'solid'?
Does the whole lot need to come up and be re-laid with some sort of backing between the tiles and floorboards do you think? Or is there any other way around this issue?
Also, the same ceramic tiles have been laid in the kitchen directly on to the screed they put on top of the underfloor heating. No problems at the moment, but is that the way it's meant to be done or should there still be some sort of underlay on this?
We also have concerns that they haven't used adhesive that is 'flexible' and suitable for ceramic tiles. Is that a huge problem?
Thanks for reading and any advice you have would be hugely appreciated!
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