Spray-Foam Insulation Behind Acrylic Stucco
I have a 1952 house in climate zone 3C, that was recently re-sheathed with OSB plywood, 2 layers of “D” paper, keene driwall rain screen, then 3 coat stucco with an acrylic finish coat.
I have the walls open from the inside, and am considering re-insulating with closed cell spray foam between the studs. I’m concerned about sandwiching the OSB between 2 vapor barriers. Will the rain screen be sufficient to allow the OSB to dry?
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