Correct Orientation for Foil-Faced Polyiso Over Drywall
I plan to install 1-1/4″ polyiso foamboard over existing drywall, then 3/4″ furring strips, then 1/2″ of drywall. Should the foil face towards the interior or the exterior?
If it matters, this is for Austin, TX 78722 where we need more cooling than heating, and I’ll be using two layers of polyiso (1/2″ + 3/4″), because I can’t find 1″ polyiso locally. I do plan to tape the edges to prevent degradation of the foamboard. Thank you for your help.
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