3/4" plywood sheathing on 8/12 pitch roof. Attic room. Roof not vented and will all be conditioned space. Strict temp and humidity control inside. 7/8s corrugated nailed directly to sheathing (with a membrance first applied) that will act as its own rain screen. Inside roof structure will have no vapor barrier and will have 2' x 4' MDF panels with 3/8" separation for venting. Rockwool insulation to prevent moisture adsorption and absorption. Designed to dry to the inside. So impermeable or permeable for the roof, and whose product?
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