For best results refer to our wood and composite deck joist span table.
Floor joist spans 2x6.
See our complete chart of floor joist size span and spacing requirements before you build.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
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.
If a room is 10 inside to inside and the joists are cut 10 7 so they will bear fully on both walls then the span will be 10.
1 ft 0 3048 m.
The larger the deck the larger the joists.
1 psf lb f ft 2 47 88 n m 2.
Finally select a type of lumber.
Also available for the android os.
2 pine is the the most common so the field is pre selected at that.
Simple span joists and rafters with uniform load.
Maximum floor joist span for no.
We ve included 2x6 2x8 2x10 and 2x12 joist spans and more.
Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111 89 74 63 12 178 133 107 89 76 14 207 156 124 104 89 16 237 178 142 119 102 18 267 200 160 133 114.
Span calculator for wood joists and rafters also available for the android os.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.
This will be slightly less than the length of the board.
True floor joist span calculations can only be made by a structural engineer or contractor.
Live load is weight of furniture wind snow and more.
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.
Dead load weight of structure and fixed loads 10 lbs ft 2.
View joist rafter tables.
Enter a span for the joist.
