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Vented next to unvented

nc116 | Posted in General Questions on

I understand that for sheathing and adjacent rafters this is a bad idea, but what about a stepdown attic space where it’s a separate roof? I am thinking of sealing one side of my house from the other so I can do closed cell SPF unvented on one side and regular rafter vents on the other. Is this possible?

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  1. Expert Member
    MALCOLM TAYLOR | | #1

    nc116,

    Yes. The roofs don't know or care whether their adjacent neighbour is or isn't vented.

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