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2x12 floor joist span table. These tables can also be used to determine deck joist span. The numbers in gray indicate the distance between the support posts. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. A double 2x12 beam can span 12 feet.
A 2 2x10 can span 10 feet and so on. Span calculator for wood joists and rafters also available for the android os. 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.
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. 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. True floor joist span calculations can only be made by a structural engineer or contractor. See our complete chart of floor joist size span and spacing requirements before you build.
Also available for the android os. 2 grade of douglas fir are indicated below. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
View joist rafter tables. Dimensional lumber deck beam span chart. Live load is weight of furniture wind snow and more. Spans in this table were derived from the irc table r502 3 1 2 design criteria.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Span tables for joists and rafters 3 american wood council table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load. 1 psf lb f ft 2 47 88 n m 2. We ve included 2x6 2x8 2x10 and 2x12 joist spans and more.
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