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I would like to know if it will be ok to use polyiso rigid insulation 4" thick with the felt facing on both sides to insulate a cathedral ceiling. It's a metal roof, 2x6 rafters, vented soffit and ridge vent. The cabin is located in the Sierra in California, very dry during the summer months, snow in the winter. I plan on cutting to fit between the rafters and foaming it in place leaving an air gap between the foam and roof underside.