AL Insulation Practice Questions - Alabama Insulation Contractor Examination Exam

Under IBC/IRC classifications, a Class I vapor retarder has a permeance of:

0.1 perm or less Greater than 0.1 and not more than 1.0 perm Greater than 1.0 and not more than 10 perm Greater than 10 perm

Correct Answer:

0.1 perm or less

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