I am building a new 16 x 16 addition with a pier foundation well off the ground.
I’m questioning the best way to insulate and close off the floor. I live in northern Maine. I am insulating the rest of the house with closed-cell spray foam and an exterior layer of iso foam will be applied.
Can I spray up into the floor joists and around the rim joists to seal this area and then close off the area with the iso and exterior plywood? My foam contractor would not be filling the floor joist cavity so there would be an air space. Or should I fill the air space with additional insulation?
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