What layers (insulation, lath, etc.) are needed for metal roof installation on an old shed?
I plan to remove old shingles, repair sheathing damaged by a fallen tree, then should I apply:
(1) an underlayment (condensation control)
(2) Foam board w/foil side down
(3) purlins for securing the steel panels
(4) steel roofing
Is that a correct way?
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