Polyisocyanurate vs. Phenolic Foam Board
I am retrofitting my 30-year-old timber frame/ISP covered house. (I built the place in 1991 when no one was talking about rain screen systems.) I’m replacing all windows but am wondering about adding foam boards to the outside of the outer OSB skin.
Is phenolic better for the environment and insulation value than polyisocyanurate? If so, where can one purchase phenolic foam board in the U.S.?
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