Applying Polyiso foam on the outside and inside of a wall?
I am remodeling a home in southern Maine with 2×4 walls. It will have a heat recovery ventilator. I plan on putting 1 1/2′” polyiso foil faced foam on the outside with joints caulked and taped. I then planned to install R-13 betwen studs covered with 1/2″ polyiso foil faced foam on the inside with drywall over that. My reasoning is in summer time this will keep any warm moist air from condensing on the back of the drywall when the house is air conditioned. Am I right or is there a better way?
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