I have access to some 3.5″ reclaimed polyiso that I believe has a fiberglass facing on each side of the board. At least, I think its fiberglass. The best way to describe the facing is it kind of reminds me of landscape fabric.
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My intention was to use the foam as sheathing on the walls of the house I’m building. I am just down the road from Urbana, IL (Climate Zone 5A….but feeling a bit more like 4A at times).
My wall assembly (from interior to exterior) is as follows…..
– drywall
– 2×6 with mineral wool batts (R-23)
– ZIP sheathing
– 3.5″ polyiso (~R-22)
– cladding (combination of air gap w/ stacked limestone veneer and EIFS)
My questions are…
1.) Am I right that this is probably fiberglass facing on the polyiso? I’m new at this and have seen felt faced and foil faced, but not fiberglass faced. (my guess is I’m right)
2.) Will the facing (whether its fiberglass or not) on the polyiso in any way effect my ability to use the foam for its intended purpose? (my guess is no)
3.) Martin, I read your blog “Return to the Backyard Tape Test.” If I can use the reclaimed polyiso and it is indeed faced with fiberglass, any suggestions for a good tape to use at the seams? (my guess is something that was tenacious on the house wrap will work well on this facing…)
Thanks in advance!
– Rob
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