We are building a new home in Nova Scotia Canada. It’s 2×6 walls with osb shielding and we are spray foaming the stud cavities with 4in of close cell foam and installing 1in rigid foam board on interior side to create a thermal break. There will be an air gap between the spray foam and the rigid foam, will this cause moisture problems in the walls and also would it be wise to reduce the amount of spray foam by 1in to offset the cost of the rigid board.
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