Recommended build up for unvented metal roof
Hi – Building a new house in Austin TX. Exposed trusses 4′ on center with 2×6 center match v groove decking, also exposed to inside.
Original plan was peel and stick WRB on top of T&G decking, then 4.5″ of poly iso above that, screwed down with the plates. Fully adhered 60 mil EPDM.
Seems like nobody does EPDM down here, and everyone does metal roofing, so I’m considering sticking with what’s locally popular. What would this setup look like with metal on top?
WRB still on top of decking, and below insulation? Or on top of insulation?
Maybe 1×4 or 2×4 sleepers on top of insulation, on the diagonal, and then metal roofing screwed to that?
Appreciate any advice. Thanks!
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