Originally Posted by kok328
House won't be able to breath through EPDM.
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 EPDM, but I would rather not if I don't have to.