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Hello, just trying to get my head round wet UFH in our conversion: The concrete is rough and unlevel in places so I'm hoping the screed will even things out, there is approx 200mm available in some places, but it varies. I'm planning: 10mm slate floor 65-70mm screed 100mm PIR The electrician has put the ring main on the floor so need to tuck the DPM under it. Is this ok touching the PIR? I read EPS can degrade plastic?? DPM ?? 10mm sand blinding?? or EPS?? Which sand is best? original rough concrete slab with a slight slope Which diameter of UFH pipes and which spacing is best to be the most flexible? Going to start with a Willis heater and save up for ASHP, but might need a boiler . Thank you!