Framing & StructuralCâu 362 / 700
CALCULATION: A deck uses 2x8 pressure-treated joists of a species with a span table value of 12 feet at 16 inches on center. If the framer moves the joists to 12 inches on center, the allowable span will generally:
a.Increase somewhat, because closer joists each carry less load
b.Decrease to zero
c.Stay exactly the same
d.Double to 24 feet
Giải thích
Spacing joists closer together (16 to 12 inches on center) gives each joist a smaller tributary load, so span tables allow a somewhat longer span at the tighter spacing. It does not drop to zero, stay identical, or double; the increase is modest, per the table, not a doubling.
Trích dẫn luật: 2025 CA Residential Code §R507.6Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A deck ledger is attached to the house rim joist. Which fastening is generally ACCEPTABLE, and which is NOT?
- What flashing detail BEST protects the house at a deck ledger connection?
- For a wood deck post that carries deck loads down to a footing, which connection detail is MOST important at the base?
- Where a deck beam bears on a supporting post, what is the BEST practice for the connection?
- Besides the ledger fasteners, the code requires a lateral load connection between the deck and the house structure. What does this connection primarily prevent?
- On a raised residential deck, guards are required, and the guard infill (balusters/pattern) must be designed so that which object cannot pass through?
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