Core TradesCâu 208 / 700
A vapor retarder placed directly under a concrete slab-on-ground in habitable space is commonly required to be polyethylene sheeting with a MINIMUM thickness of:
a.4 mil
b.6 mil
c.10 mil
d.15 mil
Giải thích
A minimum 6-mil polyethylene vapor retarder is commonly required beneath interior slabs to limit moisture migration into the floor. 4 mil is thinner than the standard minimum, while 10 and 15 mil are heavier products sometimes specified but above the basic requirement.
Trích dẫn luật: 2025 CA Residential Code, R506 (Concrete Floors on Ground)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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