Floor joist span tables for various sizes and species of wood.
2x12 span floor joist.
2 grade of douglas fir are indicated below.
Also available for the android os.
Span calculator for wood joists and rafters also available for the android os.
2x10 to 15 feet and 2x12 to 18 feet.
1 psf lb f ft 2 47 88 n m 2.
True floor joist span calculations can only be made by a structural engineer or contractor.
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.
Dimensional lumber deck beam span chart.
See our complete chart of floor joist size span and spacing requirements before you build.
View joist rafter tables.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
A 2 2x10 can span 10 feet and so on.
A 2x8 up to 12 feet.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Spans in this table were derived from the irc table r502 3 1 2 design criteria.
Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span.
We ve included 2x6 2x8 2x10 and 2x12 joist spans and more.
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.
A double 2x12 beam can span 12 feet.
The numbers in gray indicate the distance between the support posts.
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.
Live load is weight of furniture wind snow and more.
1 ft 0 3048 m.
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.
The larger the deck the larger the joists.
