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R507.6 Deck Joists
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Maximum allowable spans for wood deck joists, as shown in Figure R507.6, shall be in accordance with Table R507.6. The maximum joist spacing shall be limited by the decking materials in accordance with Table R507.7. The maximum joist cantilever shall be limited to one-fourth of the joist span or the maximum cantilever length specified in Table R507.6, whichever is less.
DECK JOIST SPANS FOR COMMON LUMBER SPECIES (ft. - in.)
|SPECIESa||SIZE||ALLOWABLE JOIST SPANb||MAXIMUM CANTILEVERc, f|
|SPACING OF DECK JOISTS|
OF DECK JOISTS WITH CANTILEVERSc
|Southern pine||2 × 6||9-11||9-0||7-7||1-3||1-4||1-6|
|2 × 8||13-1||11-10||9-8||2-1||2-3||2-5|
|2 × 10||16-2||14-0||11-5||3-4||3-6||2-10|
|2 × 12||18-0||16-6||13-6||4-6||4-2||3-4|
|2 × 6||9-6||8-8||7-2||1-2||1-3||1-5|
|2 × 8||12-6||11-1||9-1||1-11||2-1||2-3|
|2 × 10||15-8||13-7||11-1||3-1||3-5||2-9|
|2 × 12||18-0||15-9||12-10||4-6||3-11||3-3|
|2 × 6||8-10||8-0||7-0||1-0||1-1||1-2|
|2 × 8||11-8||10-7||8-8||1-8||1-10||2-0|
|2 × 10||14-11||13-0||10-7||2-8||2-10||2-8|
|2 × 12||17-5||15-1||12-4||3-10||3-9||3-1|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
- No. 2 grade with wet service factor.
- Ground snow load, live load = 40 psf, dead load = 10 psf, L/Δ = 360.
- Ground snow load, live load = 40 psf, dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever with a 220-pound point load applied to end.
- Includes incising factor.
- Northern species with no incising factor.
- Cantilevered spans not exceeding the nominal depth of the joist are permitted.
The ends of joists shall have not less than 11/2 inches (38 mm) of bearing on wood or metal and not less than 3 inches (76 mm) of bearing on concrete or masonry over its entire width. Joists bearing on top of a multiple-ply beam or ledger shall be fastened in accordance with Table R602.3(1). Joists bearing on top of a single-ply beam or ledger shall be attached by a mechanical connector. Joist framing into the side of a beam or ledger board shall be supported by approved joist hangers.
Joist ends and bearing locations shall be provided with lateral resistance to prevent rotation. Where lateral restraint is provided by joist hangers or blocking between joists, their depth shall equal not less than 60 percent of the joist depth. Where lateral restraint is provided by rim joists, they shall be secured to the end of each joist with not fewer than three 10d (3-inch by 0.128-inch) (76 mm by 3.3 mm) nails or three No. 10 x 3-inch (76 mm) long wood screws.
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