Residential Wood Floor Joist Span Table

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.

Residential wood floor joist span table.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. So our house would look like the picture below with all floor joists 2 x 8. Low pitch 6 12 or less 14 15 roof span tables. 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. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Span tables for domestic floor joists to bs 5268 7 1 note. Straight line interpolation shall be permitted for intermediate spans and design values.

Dead load deflection is limited to l 360 and total load deflection is limited to l 240. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. 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. Lp solidstart i joists technical guide for residential construction lpi.

View joist rafter tables. True floor joist span calculations can only be made by a structural engineer or contractor. These tables can also be used to determine deck joist span. Made of engineered wood substrate a renewable resource.

The spans are based on simple span joists. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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.

The apa mark of quality. Apa pris are recognized through icc es esr 1405. Floor joist span tables for various sizes and species of wood 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. Reading the table you ll see that 2 x 8s installed 16 apart on center can span 12 4.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.