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Vapor Control for Continuous Insulation – Zone 6

Jbirdspy | Posted in General Questions on

Hi all,

Looking to install continuous insulation with no cavity insulation on a tiny residential home in Zone 6. My question is, do I need a vapor barrier between the insulation and sheathing, or am I good with just taping and sealing the joints in the polyiso?

thanks!
jb

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  1. Malcolm_Taylor | | #1

    jb,

    You are fine with what you have.

    Taping the joints will be part of your air-sealing strategy. The layers of foam and plywood will act as vapour-retarders, and vapour retarders/barriers don't need to be sealed.

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