Location of vapor barriers in hot humid climates

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    Matthew Bowers

    As far as the ARE is concerned, vapor barrier should always be located on the warm, wet side of the insulation. For hot, humid climates, that means the exterior side of the insulation. For other North American climates, the opposite is the case. The same concept tracks for the rest of the building envelope (roof/slab).

    Reality is much more complicated, but this is all you'll need to keep straight for the ARE. Any expert subject matter on the topic will be far more in depth than you will need to know regarding air or vapor barriers for the exams.

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