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The walls consist of (from inside to out): 5/8" drywall, 3/4" OSB, the 3.5" XPS insulation spray foamed at all the joints. Assuming the spray foam stuck to the XSP, there shouldn't be any breathing anyway. Alternatively, I could leave a small gap at the bottom for air to circulate under the...

Aside from the obvious observations that it wouldn't look like other house in the neighborhood, are there any functionality issues with using epdm rubber as siding? I have a 20 foot high, 32x64 box shaped flat roofed (epdm) house I am building. I am thinking to tack the siding epdm under the...