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low slope exterior insulation roof dry to the inside w/ air barrier

jesjonesy | Posted in General Questions on

I have a 2×6 t&g exposed ceiling covered by 3/8″ plywood sheathing. I just realized I need to cut the overhangs and wrap the wall air barrier up to meet the roof air barrier or I will have air leaks at the roof sheathing. I am using Henry Blueskin vp100 on the wall sheathing and am wondering if I can wrap that onto the roof as the air barrier. I plan to cover that with two layers of polyiso taped seems, 1/2 inch plywood, and then a peel and stick membrane under the metal roof. The roof is low slope and I do not have any venting.

Will the blueskin allow drying to the inside if any moisture enters the insulation cavity? Do I even need to worry about that? I am in climate zone 3. Thank you,

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  1. Expert Member
    Michael Maines | | #1

    Blueskin's warranty does not cover rooftop installation. It would work as an air barrier, though.

    1. jesjonesy | | #2

      Is there any issue with it not drying to the inside? Or is there another product that may work better as an air barrier olonly and allow drying to the inside. Very worried about my 2x6 t&g not air sealing well enough with the flimsy 3/8" plywood and taped seams only. I will have taped polyiso, and peel and stick above, so maybe this isn't a big deal. Thank you in advance for the guidance.

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