Residential Wood Floor Joist Span Table

True floor joist span calculations can only be made by a structural engineer or contractor.

Residential wood floor joist span table.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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. Made of engineered wood substrate a renewable resource. Of bearings and is based on uniformly loaded joists.

High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. Apa pris are recognized through icc es esr 1405. Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4. Span tables for domestic floor joists to bs 5268 7 1 note.

The spans are based on simple span joists. Dead load deflection is limited to l 360 and total load deflection is limited to l 240. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. The maximum span is measured o c.

This performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span tables. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. View joist rafter tables. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

Straight line interpolation shall be permitted for intermediate spans and design values. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. The apa mark of quality.

So our house would look like the picture below with all floor joists 2 x 8. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Lp solidstart i joists technical guide for residential construction lpi. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.

Low pitch 6 12 or less 14 15 roof span tables. These tables can also be used to determine deck joist span.