NM CID GS-4 Practice Questions - New Mexico CID GS-4 Concrete, Cement, Walkways And Driveways Examination Exam

Per IRC 2021 Section R506.2.3, the under-slab vapor retarder for a dwelling floor shall be:

Any 2-mil furniture cover, unlapped A minimum 10-mil vapor retarder conforming to ASTM E1745 Class A, with joints lapped not less than 6 inches A 6-mil polyethylene sheet with no ASTM class, matching only the 2018 IRC Omitted under all garage slabs and all interior slabs alike, with no exceptions listed

Correct Answer:

A minimum 10-mil vapor retarder conforming to ASTM E1745 Class A, with joints lapped not less than 6 inches

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