Due to the price difference, I have decided to go with R-21 Owens Corning Next Gen Fiberglass batts. The exterior of my wall is 2in of Poly-iso then zip sheathing… Due to the price difference, I have decided to go with R-21 Owens Corning Next Gen Fiberglass batts. The exterior of my wall is 2in of Poly-iso then zip sheathing…Read MoreGreenBuildingAdvisor

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