I have a Victorian house which I extend 20 years ago. The kitchen essentially remained the same. The kitchen floor was never excavated and it is asphalt laid over the old quarry tiles. I laid a Junkers 9mm floating wooden floor. Over the 20 years I have had problems with damp/humidity levels in the room which does cause the flooring to expand and buckle slightly. This tends to happen during the late Summer months when there is no heating on. Added to that over the same period I have had a couple of disasters with e.g. bust pipe on a dishwasher, a blocked drain and the floor has got wet. It is time to replace it.
Ideally I think the floor should come out. That becomes a big job as I would need to remove all the kitchen units, excavate down a sufficient depth to install base, DPC, insulation, screed etc. Clearly there would be improvements in thermal performance and and hopefully also reduce humidity. Speaking to various people though they think it is unlikely I am getting much, in any, damp coming up through the floor it will be the general humidity. I have noted that the floor moves once the humidity gets over 40%.
Any ideas please and any options considered. I would prefer to keep a wooden floor, do I replace it with something heavier? What about underfloor heating? Should I dig it all out and start again? Could use tiles but then cooler, or something like Amtico?