Question 67 Materials that have a perm rating of 1.0 or less are: 1. vapor retarders. 2. insulators. 3. convective venti
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Question 67 Materials that have a perm rating of 1.0 or less are: 1. vapor retarders. 2. insulators. 3. convective venti
Question 67 Materials that have a perm rating of 1.0 or less are: 1. vapor retarders. 2. insulators. 3. convective ventilators. 4. diffusion ventilators. Time Remaining 00:36:30 Question Answered 68