Urethane spray foam on exterior above grade block walls?
I was talking with a urethane spray foam installer this morning who stated numerous concerns about all other spray foam products but his – more notably open cell products. He says they do not perform in areas such as rim joists, etc. They don’t belong anywhere but in stud cavities on sidewalls. Go figure. He is currently spraying my neighbors’ exterior above grade block wall foundation(in addition to 4-6″ below grade) wall with a closed cell spray foam. He said there was a study that indicated this is as efficient as spraying the main floor 8′ exterior walls. I’m wondering if anyone has any info on this. He has been a spray foam contractor for 40 years, and seemed to know the spray foam argument well. But, I’ve never seen any stats on his particular approach. I live in Iowa, and the house he is working on has 2×4 exterior walls, and was built in the 1960s. I’m unsure of the wall/attic insulation. I’m sure his approach will help but is it as effective as he says?
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