Good Breathable P&S Synthetic Roof Membrane

Looking for a good breathable synthetic peel & stick roof membrane that would would well underneath an elevated (purlin) metal roof. Most P&S membranes I have seen are not breathable. Looking for a good breathable synthetic peel & stick roof membrane that would would well underneath an elevated (purlin) metal roof. Most P&S membranes I have seen are not breathable.Read MoreGreenBuildingAdvisor