Polyiso panels alone for insulating walls and ceiling of building?
I am in zone 4a and have a large pile of recycled polyiso panels I wanted to use in 3-4 layers for walls and ceiling of my post frame shop and am unsure if this will cause any problems?
I notice that folks will put foam on outside and then fill cavities with other types of insulation. Since I already have this insulation, I would like to us eit if it is not a bad idea.
My two types of polyiso:
1.5″ panels with grey/black felt covering
2″ panels with a thin white composite (fiberglass?) covering.
Thank you for your advice.
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