| http://www.w3.org/ns/prov#value | - If you are hesitating between two materials, the one with the higher R (or RSI) factor is generally the best choice.Air and vapour-tightness: Depending on how the walls and roof are built, some types of insulation, such as spray polyurethane foam, can serve as both air and vapour barrier for the building envelope.Safety factors at the insulation site: The importance of resistance to high temperatu
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