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I am building a new barn for horse stalls that is a single pitch 30x20 for two stalls right now. I have wood purlins and was wondering what to run between the purlins and the metal roof. I do not want to use OSB so was looking at just using synthetic roof underlayment or putting 1/2 rigid foam board down with underlayment over that then metal roof. however I also read that some people have used bubble insulation between purlins and metal roof. Budget is somewhat important but want a quality installation as well. Roof pitch is 3/12 and I am on the west side of Washington State which gets very wet in the winter. thank you
9/19/2023