Floor Span For 2x12

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Floor span for 2x12.

1 has a higher strength than no. 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. Three other grades no. See our complete chart of floor joist size span and spacing requirements before you build.

Boards cut and graded as structural select allow the longest spans. Also available for the android os. 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. 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.

3 due to fewer knots and defects in the grain of the wood. Maximum floor joist span for no. 1 psf lb f ft 2 47 88 n m 2. 2 grade of douglas fir are indicated below.

Floor joist span tables for various sizes and species of wood. 1 ft 0 3048 m. Spans in this table were derived from the irc table r502 3 1 2 design criteria. The numbers in gray indicate the distance between the support posts.

A double 2x12 beam can span 12 feet. Dead load weight of structure and fixed loads 10 lbs ft 2. Floor joists support structural load and require lumber species capable of supporting those loads. This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12.

True floor joist span calculations can only be made by a structural engineer or contractor. Hem fir 2 joists with a live dead load of 40 10 psf. 3 allow shorter spans. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

It also shows the maximum that the beam can span for various numbers of such pieces of lumber built together this is indicated by 3 ply 4 ply and 5 ply. The full table shows more lumber sizes. Span calculator for wood joists and rafters also available for the android os. A 2 2x10 can span 10 feet and so on.