Core TradesCâu 158 / 700
In a heating-dominated (cold-winter) climate, a vapor retarder in an exterior wall is generally installed on which side of the insulation?
a.The exterior (cold) side
b.Both faces of the insulation
c.The interior (warm-in-winter) side
d.It is omitted entirely
Giải thích
In a cold climate the warm, moist interior air moves outward, so the vapor retarder goes on the interior (warm) side to stop moisture before it reaches the cold sheathing where it would condense. Placing it on the cold side, or on both sides, can trap moisture inside the wall and cause rot.
Trích dẫn luật: 2025 CA Residential Code §R702.7Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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