Paper backing on polyiso rigid foam: Which way should it face?
I am building a new house in climate zone 3A – far northeast Texas.
My wall layers, from exterior to interior, are as follows: Hardie sheet siding (board and batten), housewrap (Tyvek Drainwrap), 1 inch of rigid polyiso foam, 1/2″ OSB. Between-stud insulation will most likely be either cellulose or fiberglass batts, possibly blown-on foam.
The polyiso that I’ve bought is unfaced on one side and, on the other side, has a kraft-paper-like backing. Should this kraft paper backing face the interior or the exterior of the house?
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