Best insulation for underfloor heating

16 Jul 2015
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United Kingdom
i have a block and beam floor and am installing wet underfloor heating. I only have 50mm for the insulation . Can someone please recommend a good insulation board. I am aware that there are new products on the market which can achieve similar u values as thicker PIR boards but wondered if anyone could recommend something which wS compatible with the pipes in screed underfloor heating.
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