Proper metal roof installation.
We are building a new home in Southeastern Pennsylvania. We are having a Drexel Metal standing seam metal roof installed over plywood sheathing. The attic is unconditioned space with blown in insulation to a value of R-60 or so. Should the metal roofing be installed over strapping. We will have a vented soffit for air circulation.
when discussing with the roofing contractor he is adamant that this is not necessary or appropriate. My thought is that the metal should be separated from the plywood.
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