Hi I've got a problem on a building site with a floor. The UFH was turned on last week and now the floor tiles have debonded. In my opinion the floor was to hot but was assured the manifold was set to low. However the wall stat read 22 degrees. I was told if the doors were kept shut the heating could work properly and settle. I removed a tile which came up with all the adhesive attached to reveal a damp floor and water collected in the small voids. It was like this across the floor. I'd like to point out a small area around the cupboard hadn't been done due to the plasterers using a temporary tap in there which left the cupboard damp. Unfortunately the builder had agreed on a decoupling membrane before we started and I'd forgotten this conversation. Only two rows had gone down but I was confident it would be fine as its only 27m and been down two months. We used norcross flexible adhesives and tiled it like the other thousands of floors we've done previously. Sadly I guaranteed it wouldn't fail due to a lack of decoupling membrane. Obviously it has but I'm adamant it's not for that reason. Am I wrong?