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How far can a 2x8 floor joist span without support?


  1. How far can a 2x8 floor joist span without support?
  2. How far can you SPAN floor joist without support?
  3. What is the longest span for floor joists?
  4. How much weight can a 2x8 support?
  5. What size lumber can span 24 feet?
  6. How far can you cantilever a 2x8 deck joist?

How far can a 2x8 floor joist span without support?

But first, generally, how far can a 2×8 span without support? Depending on various factors, the maximum span for a 2×8 floor joist is 16' 6”. The maximum span for roof rafters is 23' 9”. For headers, the maximum span is 11' 2”.

How far can you SPAN floor joist without support?

The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12'-6”, ceiling joist 20'-8”, rafter 18'-0”, deck board 24”, deck joist 9'-11”, deck beam 8'-3”, and 6'-1” as for header. Always check the codes for determining factors or consult a Structural Engineer.

What is the longest span for floor joists?

26'A floor joist can span nearly 26' in the most extreme cases. A select douglas fir 2×12 supporting a 30 psf live load and 10 psf dead load, spaced at 12” will have the greatest span length.

How much weight can a 2x8 support?

The weight that can be supported by a double or triple wood headerSpan (feet)Weight Supported (lb)2 x 2" x 6"3 x 2" x 8"61680469083990103190

What size lumber can span 24 feet?

For span upto 24 feet, generally you need 4 1/2 × 11 1/4 standard size of LVL beam or 2×16 dimensional lumber at 16″ apart from centre on normal weight condition which providing great stability for your projects.

How far can you cantilever a 2x8 deck joist?

1/4The American Wood Council states that cantilevers are limited to 1/4 the span of the joists. Joist Spacing (o.c.) Maximum allowable overhang cannot exceed 1/4 of the actual main span.



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