Insulating & damp proofing concrete + underfloor heating

9 Oct 2010
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United Kingdom
Just after some advice on insulating and damp proofing an existing concrete floor and putting a wet underfloor heating system down.

Even though we're rebuilding a large proportion of the bungalow and putting on a new roof (forming a 1.5 storey property), due to planning reasons I can't lose too much height in the rooms. Doors etc are not a problem as only a couple will remain and there are currently no stairs. The rooms are currently 235cm high so was planning on around 100mm for the new floor height, give or take.

I was planning on laying a damp proof membrane across all floors and then laying some Celotex PIR insulation on top - about 50-60mm. I was then planning to fix the underfloor heating (wet piped) straight onto the insulation boards, and then screed over the whole lot - approx 40-50mm of screed. On top of this will be engineered wooden floors and tiles (either large ceramic or porcelin). Does this sound sufficient / correct or should I be considering an alternative approach.

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