What size lumber can span 26 feet | Floor Joist, Ceiling joist, rafter & beam size for a 26 ft span
What size lumber can span 26 feet | Floor Joist, Ceiling joist, rafter & beam size for a 26 ft span
Spanning 26 feet with lumber requires careful selection of size and type to ensure adequate support and minimal deflection. The specific size needed depends on various factors, including the type of wood, the load conditions (live and dead loads), and whether the lumber is being used as a floor joist, ceiling joist, or beam.
Here's a general guideline for the size of lumber required to span 26 feet:
1) Floor Joists: A 14"x3-1/2" i-joist which spaced 16 inches on center (o.c.) might be able to span up to 24 feet at live load of 40 psf and dead load of 10 psf and deflection limits L/480.
2) Ceiling Joists Ceiling joists carrying only ceiling loads can span greater distances. A 2x10
Southern Pine dss which spaced 12 inches on center (o.c.) might be able to span up to 26 feet at live load of 20 psf and dead load of 10 psf and deflection limits L/240.
3) Rafter size: Roof rafter carrying only roof loads can span greater distances. A 2x12 Southern Pine #1 which spaced 16 inches on center (o.c.) might be able to span up to 26 feet at live load of 20 psf and dead load of 10 psf and deflection limits L/240.
4) Beam Size: For a beam spanning 26 feet and supporting significant loads (e.g., floor loads), A 3-1/2" x 11-7/8" LVL (laminated veneer lumber) might be able to span up to 26 feet.
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