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I have attached a data sheet from a manufacturer of polystyrene with foil glued to both sides. How do I model it as underfloor insulation?

April 26, 2017attached Data foil glued manufacturer model polystyrene Sheet underfloor

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I have attached a data sheet from a manufacturer of polystyrene with foil glued to both sides. How do I model it as underfloor insulation?

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This is just bulk insulation with foil on both sides so select the 9th insulation option for floors. The polystyrene is 15 mm thick so using the R calculator in the tools menu gives it a bulk R value of 0.4. So its the same as double sided draped foil plus R0.4 Never believe a manufacture’s claims about the thermal properties of products that use foil surfaces. In this case the emittance they claim is much too low, and they are pretending that a thermal laboratory has tested the claims rather than simply having a tame “consultant” do some calculations as they have actually done.