How far can dimensional lumber span?
How far can dimensional lumber span?
Max. Live Load 60 lbs/ft2 (2873 N/m2)
| Maximum Span (ft – in) | ||
|---|---|---|
| Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |
| 2 x 10 | 12 | 16′ – 8″ |
| 16 | 15′ – 2″ | |
| 24 | 13′ – 3″ |
How far can a 2×10 span without support?
Douglas fir 2-by-10 joists graded as “Structural Select” allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart, 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing.
How far can 6×2 timber span?
A 2×6 joist can span anywhere between 8′ for Cedar and Redwood to 9′ for Pine and Fir at 16″ OC. 12″ OC yields longer spans, while 24″ OC allows shorter spans.
How far can a 2×10 span for a roof?
Max. Live Load 20 lbs/ft2 (956 N/m2)
| Maximum Span (ft – in) | ||
|---|---|---|
| Nominal Size (inches) | Rafter Spacing, Center to Center, OC (inches) | Lumber Grade |
| 2 x 10 | 12 | 27′ – 6” |
| 16 | 25′ | |
| 24 | 20′ – 9” |
Can you span 12 feet with a 2×6?
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 size lumber can span 20 feet?
For 20-foot spans, the wood beam has to be at least 18 inches in depth.
How far can a 2X6 joist span without support?
A general rule of thumb for joist span is 1-1/2 times a board’s depth in feet, however, it’s not that simple. The distance a 2×6 can span is determined by the species, grade, location, use, load, and spacing. Based on building codes, a 2×6 can span anywhere from 2′-1” to 20′-8” depending on the affecting factors.
How far can a 2×6 joist span without support?
How far can a roof span without support?
A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span.
How far can 2×8 span without support?
How do I keep them even? 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. The larger the deck, the larger the joists.
Can you span 20 feet with wood?
If you are considering a 20-foot span, there is a certain size beam that is required. For 20-foot spans, the wood beam has to be at least 18 inches in depth. There are online calculators available to help when it comes to determining what size beams are required for specific spans.
What are the dimensions of a 4 span table?
4 Span Tables for Joists and Rafters American Wood Council DESIGN CRITERIA: Deflection – For 30 psf live load. Limited to span in inches divided by 360.
What does it mean to have a span in lumber?
Span refers to the distance a piece of dimensional lumber can cover before it needs to be supported by a foundation or support post. When span guidelines are given, they refer to the distance between the center of one support to the center of another.
Is there a span calculator for wood joists?
Uses wood properties from the 2012 NDS. Results from this calculator do not reflect the latest information, contained in the 2018 NDS. Wet service conditions? Incised lumber? Span Calculator for Wood Joists and Rafters available for the iPhone.
How to calculate the span of a beam?
Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths.