Hot Roof assembly, furring strips or full sheathing over foam?
Sorry in advance if some version of this has been asked and answered before…
I’m working on my roof assembly now and am debating a few options.
Ive got 2×6 T&G which i’ve installed plywood over the top and taped the edges where it meets the wall sheathing. im getting ready to do 2 layers of 3.5″ polyiso over the top. Should I tape all the seams of that plywood before the polyiso?
On top of the polyiso:
I was going to do zip sheathing on the whole roof, taped seams and then metal roof.
Is it better practice to do furring strips on top of the polyiso to give it ventilation and then metal roof on top? Do you install roofing underlayment on top of the furring strips?
zone 4 (Oregon countryside)
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