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.
Maximum floor joist span for 2x10.
Live load represents the weight of furniture snow etc.
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.
Floor joist table joist size joist spacing maximum span.
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.
The numbers in gray indicate the distance between the support posts.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Hem fir 2 joists with a live dead load of 40 10 psf.
2 grade of douglas fir are indicated below.
Dead load is the weight of the structure and any fixed items.
The larger the deck the larger the joists.
Span calculator for wood joists and rafters also available for the android os.
1 psf lb f ft 2 47 88 n m 2.
Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart.
Spacing is measured from the center of one joist to the center of the next.
1 ft 0 3048 m.
This chart is for basic reference only.
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.
Dimensional lumber deck beam span chart.
A 2 2x10 can span 10 feet and so on.
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.
The maximum span distance for 12 inch spacing is greater by as much as 30 percent compared to 24 inch spacing.
Also available for the android os.
These tables can also be used to determine deck joist span.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Spans in this table were derived from the irc table r502 3 1 2 design criteria.
Maximum floor joist span for no.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
If you have any questions.
View joist rafter tables.
2 2x10 o i 6 2 2x4 2 2x4 2 2x6 2 2x6 2 2x6 2 2x8 2 2x8 2 2x10 2 2x10 s.
2x10 to 15 feet and 2x12 to 18 feet.
