Spray foam air gap
I and insulating a year round camp that is built on piers and 2×10’s and it is only 12″ off the ground. I plan to use closed cell spray foam in between all the joists and spray from the top of the joists and spray against some rigid 1″ foam attached to the bottom of the 2×10’s. The question I have is since the 2×10’s are 9″ high and I only plan to spray 3″ of foam is the 6″ of air gap a problem from the foam to the subfloor?
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