Hi all, I'm hoping you can help me as I dont think my wife can watch me walk around my flat with my foot rubbing against the flooring any longer. 2 years ago we had karndean fitted by a professional. We live in a block of flats with a concrete floor that wasnt at all flat. My wife and I were also in the States whilst it was being fitted so I only saw the finished result however the fitter mentioned that it wasnt possible to fully level with self levelling compound as the concrete floor was extremely uneven in some areas. Anyway fast forward to the last month and we have began noticing areas of the floor that have risen..and by risen I mean that the LVT hasnt lifted, it's like the concrete itself is inflating beneath. Now I'm not sure how much of it we are only just noticing now but I'm extremely worried about what might be the cause of this as we are noticing larger (but still isolate) differences across the floor. Could the summer ambience have anything to do with this? Is this normal? At what point should we start to worry? Our central heating also runs underneath and the areas under the pipes have always heated when the radiators are on almost like we have underfloor heating. I'm unsure if this is relevant or abnormal but I'm pretty clueless as to what's happening. Any ideas? Thanks!!