In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet.Click to see full answer. People also ask, what is the maximum span for a 2×10 floor joist? 21 feet Likewise, how far can I joist span? Spans are clear distances between supports, and are based on composite action with glued-nailed APA Rated® sheathing or Sturd-I-Floor® panels of minimum thickness 19⁄32 (40/20 or 20 o.c.) for joist spacing of 19.2 or less, or 23⁄32 (48/24 or 24 o.c.) for a joist spacing of 24. Beside this, how much weight can a 2×12 floor joist support? One 2×12 can support about 180 lbs. per foot or about 2,100 lbs.What size lumber can span 20 feet? Re: 20 foot clearspan beam size In that case, you need something like a 12-16″ GLULAM or LVL to span the 20′ and can use simple 2×8-10 dimensional lumber 16″OC as floor joists.
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