AL Insulation Practice Questions - Alabama Insulation Contractor Examination Exam

A smart vapor retarder is best described as a membrane that:

Always stays below 0.01 perm in all conditions Changes permeance with humidity to allow more drying when damp while retarding vapor when dry Is identical to aluminum foil in all properties Functions only as exterior siding

Correct Answer:

Changes permeance with humidity to allow more drying when damp while retarding vapor when dry

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