I need extra insulation in my attic which is a cold space, I was thinking of putting down the rigid foam on the floor surfaces and screwing it into the sub floor to help boost the insulation. Does anyone know if this is a good option..
+1 with WOW...go with a blow-in or batt. product and you can cover it all with a tyvek like material (class III vapor retarder MAX.) to help mitigate air movement through the fibers. It is cheaper too!
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