What Is a Smart Vapor Retarder — and When to Use It?
Smart vapor retarders (the variable-perm membranes — the Intello, the MemBrain) change their vapor permeability with the humidity: the dry (the winter — the <1 perm, the retarder) vs. the humid (the summer — the >10 perms, the vapor-open). The use: the assemblies needing the winter's protection and the summer's drying (the mixed climates — the double-sided; the retrofits — the uncertain). The vapor control's intelligence.
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How smart retarders work
The variable perm (the humidity-dependent — the polymer's; the dry cup vs. the wet cup), the winter (the interior's — the retarder; the condensation prevented), and the summer (the inward drive — the vapor-open; the drying allowed). The mixed-climate — the seasonal reversal.
When to use
The mixed climates (the heating and the cooling — the vapor's both directions), the retrofits (the existing — the assembly's uncertainty; the safe), the double vapor (the foam both sides — the trapping; the smart's — the escape), and the new (the high-performance — the WUFI-verified).
Vs. the alternatives
The polyethylene (the Class I — the cold climates'; the trapping — the mixed's risk), the kraft (the Class II — the moderate), and the vapor-open (the mild — the drying). The WUFI (the modeling — the assembly's verification; the climate's). The smart retarder is the forgiving — the variable perm covering the uncertainty.
The bottom line
Smart vapor retarders (variable-perm, <1 perm dry / >10 perms humid) suit mixed climates and retrofits needing winter protection plus summer drying — verify assemblies with WUFI modeling.
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