Mounting solar panels above roof with exterior foam?
After the epic sanity check on unvented cathedral ceiling:
I think I’ve manage to convince my builder that the exterior foam approach might be the way to go to get me over the steel I beam insulation hurdle. I found a local source for reclaimed polyiso. I was going to do a hybrid approach with 8″ exterior Polyiso (perhaps a sandwich with EPS to the outside) then on the inside of the roof deck do some ocSPF.
There are still a few issues to figure out with this approach, one of which is how to mount the solar panels. Anybody got advice on mounting solar panels above foam? My contractor recommended using 2×8 on edge for structure to mount the panels to. This is obviously a thermal bridge (not near as bad as my steel I beam).
Any details or ideas appreciated?