An engineer I have recieved drawings off has specified Polyurethane, foil backed both sides for the cavity wall insulation. However I cannot find this insulation. I have found Polyurethane rigid board but It isnt foil backed. Is there any such thing? And if there is, can someone post a link so that I can find it.
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i realise one is phenoloic and the other is polyisocyranute.... but both have similar performance to polyurethane.
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