Using Two Types of Recycled Polyiso Foam Panels
Hi. I am in zone 4a building my shop.
I am using 3.5″ (2″ + 1.5″) of recycled polyiso foam between sheathing and siding.
Pictures of foam attached.
I have two types of polyiso and am unsure which should inboard (closest to housewrap/OSB) and which should be outboard (closest to rainscreen/siding)?
The 2″ appears to have some sort of white composite fiberglass skin.
The 1.5″ has a black felt skin.
I will not have any insulation in walls.
Thanks for any clarity.
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