Fiberglass faced polyiso with WRB on the Inside?
New construction climate zone 6B. I plan to have my OSB walls with 3″ polyiso on the outside. My original plan, because of outtie windows, was to have the WRB on the outside of the polyiso. However I’m now thinking about putting the WRB on the inside of the polyiso to help with integration with an EIFS layer and stone cladding layer.
I managed to come by 3″ of fiberglass faced roofing polyiso as a factory over run for cheap. I think it is the GAF HD stuff.
This is normally for a roof covered by a waterproof layer. If this is used behind my rain screen gap do you think I need to protect it from moisture absorption by having my WRB on the outside of the foam?
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