Residential Wood Floor Joist Span Table

Lp solidstart i joists technical guide for residential construction lpi.

Residential wood floor joist span table.

Straight line interpolation shall be permitted for intermediate spans and design values. Span tables for domestic floor joists to bs 5268 7 1 note. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

These tables can also be used to determine deck joist span. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. True floor joist span calculations can only be made by a structural engineer or contractor.

The apa mark of quality. 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. Of bearings and is based on uniformly loaded joists. So our house would look like the picture below with all floor joists 2 x 8.

Apa pris are recognized through icc es esr 1405. High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Dead load deflection is limited to l 360 and total load deflection is limited to l 240. The spans are based on simple span joists. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

Made of engineered wood substrate a renewable resource. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. View joist rafter tables. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.

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. The maximum span is measured o c.