Core TradesCâu 213 / 700
To drain surface water away from a building, finished grade should generally fall a MINIMUM of how much within the first 10 feet from the foundation?
a.2 inches
b.6 inches
c.12 inches
d.24 inches
Giải thích
Codes commonly require the ground to slope away at least 6 inches within the first 10 feet (about a 5 percent grade) to keep water from ponding against the foundation. 2 inches is too flat to drain reliably, while 12 and 24 inches exceed the required minimum.
Trích dẫn luật: 2025 CA Residential Code, R401 (Foundation Drainage / Grading)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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