How far can 2×8 joists span?
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”. Finally, a single deck beam has a maximum span of 5′ 11” and double maxes out at 8′ 9”.
What is the maximum span for a 2×10 floor joist?
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 a 2×10 deck joist span?
Deck Joist Spacing by Wood Type & Deck Size
| Joist Spacing (o.c.) | 24″ | |
|---|---|---|
| Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir | 2×10 | 11′-1″ |
| 2×12 | 12′-10″ | |
| Redwood, Western Cedars, Ponderosa Pine, Red Pine | 2×6 | 6′-10″ |
| 2×8 | 8′-8″ |
Should you use 2×6 or 2×8 for deck joists?
You can use 2×6 as deck joists if the deck is low enough to the ground as not to require guard railing. When using S-P-F 2×6 deck joists, the span must not be greater than 9’0″ (2.73m) with joists at 16″ o.c. (400mm), and 9’10” (3.01m)with spacing at 12″ (300mm).
How far can 2X8 span 12?
Max. Live Load 30 lbs/ft2 (1436 N/m2)
| Maximum Span (ft – in) | ||
|---|---|---|
| Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |
| 2 x 10 | 24 | 15′ – 0″ |
| 2 x 12 | 12 | 24′ – 8″ |
| 16 | 21′ – 4″ |
How far can a double 2X8 deck beam span?
Dimensional Lumber Deck Beam Span Chart
| Joist Spans | ||
|---|---|---|
| Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine | 3X8 OR 2-2X8 | 6′-7″ |
| 3X10 OR 2-2X10 | 8′-1″ | |
| 3X12 OR 2-2X12 | 9′-5″ | |
| 4X6 | 6′-2″ |
How far can a triple 2×8 beam span?
How far can a triple 2×8 beam span:- as per general rules and guidelines, #2 grade southern pine of a triple 2×8 deck beam can span upto 10 to 11 feet when total load of 50 psf (40 psf live load + 10 psf dead load) with deflection limit L/360.
How far can a 2×10 deck beam span?
A two-ply 2×10 beam, for example, has an allowable span of just 6 feet 9 inches for a joist spanning 14 feet and 6 feet 4 inches on 16 feet. Bigger beams also mean a greater span. A 3 ply 2×10 beam can handle a span of 8 feet 6 inches for a joist spanning 14 feet and 7 feet 11 inches at 16 feet.
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