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I have a detached garage with fiberglass shingles and I want to spray foam the entire garage, sides and rafters up against the roof. I was told that any shingle warranty would be nullified if there was spray foam sprayed up in the rafters under them. Supposedly they need to have air circulating...

New to this forum, and new to the idea of a garage forum. I have a shingle/brick and vinyl siding garage, about 25 x 50ft. There are 1/2" blue foam sheets on the walls, but with plenty of gaps. The ceiling is NOT insulated, and there are 6-8 roof vents. I like the idea of spray foam...