Masonry and spray foam (SPF)
I am working on a deep energy retrofit for our 100+ year old building with a masonry shell. Rubble (limestone) foundation wall, followed by 3 wythe of common brick at up to the 1st floor ceiling, followed by 2 wythe of common brick through to the parapet.
From what I pieced together, I am thinking of using open cell SPF sprayed directly onto the masonry walls to insulate the entire building shell from the inside and attic (one contiguous layer that also acts as an air barrier). Open cell SPF seems the way to go to keep the perm rate high, allow vapor movement to the inside and out, and keep the drying potential of the masonry towards the inside. Closed cell foam may not give me enough vapor permeance and may cause long term damage to the masonry.
I have combed through this website (GBA) and BSC to figure out if open cell SPF is the way to go. I find a lot of good info for brick veneer and frame construction, including warnings about moisture management and vapor movement, but nothing that fits my solid masonry shell case.
Any advise, expertise, experience or other resources would be greatly appreciated!
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