Live load represents the weight of furniture snow etc.
Maximum span for 2x10 floor joist.
Our joist span charts are for wood joists with a maximum dead load of 10 pounds per square foot and a live load of 40 pounds per square foot.
Dead load is the weight of the structure and any fixed items.
When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
1 psf lb f ft 2 47 88 n m 2.
Also available for the android os.
A 2 2x10 can span 10 feet and so on.
The maximum span distance for 12 inch spacing is greater by as much as 30 percent compared to 24 inch spacing.
This chart is for basic reference only.
Spans in this table were derived from the irc table r502 3 1 2 design criteria.
For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.
1 ft 0 3048 m.
Floor joist table joist size joist spacing maximum span.
True floor joist span calculations can only be made by a structural engineer or contractor.
The numbers in gray indicate the distance between the support posts.
Span calculator for wood joists and rafters also available for the android os.
These tables can also be used to determine deck joist span.
2 grade of douglas fir are indicated below.
Maximum floor joist span for no.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.
The illustrations one for cantilever joists and one for flush rim beam hung joists point out where joist span measurements are taken from the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the.
A 2x8 up to 12 feet.
Spacing is measured from the center of one joist to the center of the next.
Hem fir 2 joists with a live dead load of 40 10 psf.
This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.
2x10 to 15 feet and 2x12 to 18 feet.
2 2x10 o i 6 2 2x4 2 2x4 2 2x6 2 2x6 2 2x6 2 2x8 2 2x8 2 2x10 2 2x10 s.
Live load is weight of furniture wind snow and more.
The larger the deck the larger the joists.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.
Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart.
Dimensional lumber deck beam span chart.
