Polyiso foam insulation densities
Are there any differences in densities of polyiso foam board insulation? I see the product at the home centers and then see a product by Dow Tuff R Commercial polyiso insulation board. Just like EPS has a high density insulation board, does polyiso have the same thing? I am in zone 5 and plan to use polyiso on the exterior of my house with all the joints tapes and a rain screen on top of the board.
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