Framing & StructuralCâu 380 / 700
For a dwelling stairway, what is the MINIMUM tread depth (run) required, measured horizontally between the leading edges of adjacent treads?
a.9 inches
b.10 inches
c.11 inches
d.12 inches
Giải thích
The residential code requires a minimum tread depth of 10 inches for dwelling stairs. 9 inches is below the minimum and would be too steep; 11 and 12 inches exceed the minimum and are acceptable but not the required floor value. The commercial code requires a deeper 11-inch tread.
Trích dẫn luật: 2025 CA Residential Code §R311.7.5Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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