The larger the deck the larger the joists.
Max floor joist span 2x6.
These tables can also be used to determine deck joist span.
View joist rafter tables.
2 grade of douglas fir are indicated below.
True floor joist span calculations can only be made by a structural engineer or contractor.
Dead load is the weight of the structure and any fixed items.
1 psf lb f ft 2 47 88 n m 2.
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.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
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.
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.
1 ft 0 3048 m.
Span calculator for wood joists and rafters also available for the android os.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Live load is weight of furniture wind snow and more.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.
Live load represents the weight of furniture snow etc.
Also available for the android os.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
For best results refer to our wood and composite deck joist span table.
Maximum floor joist span for no.
If you have any questions.
