What Is Vapor Drive Direction by Climate?
Vapor drive (the moisture's — the movement) follows (the warm-to-cold — the winter's inward; the summer's outward) — the direction (the climate's — the assembly's design). The cold (the interior's — the outward; the retarder's — the inside), the hot-humid (the exterior's — the inward; the retarder's — the outside), and the mixed (the both — the smart's). The drive's — the climate's compass.
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Cold climates
The outward (the interior's — the warm; the winter's — the drive), the retarder (the interior's — the Class I/II; the polyethylene's/kraft's), the vented (the cladding's — the drained; the rainscreen's), and the attic (the vented — the cold; the air-sealed's).
Hot-humid climates
The inward (the exterior's — the warm; the summer's — the drive), the retarder (the exterior's — the avoided interior; the vapor-open's — the inside), the dehumidification (the HVAC's — the latent's; the 50% RH), and the cladding (the reservoir's — the brick's; the inward's — the solar).
Mixed and verification
The both (the seasonal's — the reversal; the smart's — the variable), the WUFI (the modeled — the assembly's; the climate's — the verified), the air (the barrier's — the always; the vapor's — the distinct), and the construction (the wet's — the dried; the built-in's). The drive is the physics — the assembly is the answer.
The bottom line
Place vapor retarders on the warm side — interior in cold climates, exterior (vapor-open inside) in hot-humid; use smart variable-perm membranes in mixed climates and verify with WUFI.
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