Stacking foil face Polyiso


Old 07-10-19, 09:39 AM
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Join Date: Jun 2001
Location: USA
Posts: 378
Stacking foil face Polyiso

I'd like to use Polyiso foam board insulation for my garage ceiling. Its foil faced so I'm curious if I can stack (2) 3" thick sheets. Its ~ R6/inch so I can have ~ R36 in my ceiling. I just don't know if stacking 2 sheets would be acceptable. TIA
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