Residential Wood Floor Joist Span Table

Floor joist span tables for various sizes and species of wood.

Residential wood floor joist span table.

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. Span tables for domestic floor joists to bs 5268 7 1 note. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. True floor joist span calculations can only be made by a structural engineer or contractor.

High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Joist span and spacing is set by your local building code. Lp solidstart i joists technical guide for residential construction lpi. Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 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.

Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design. The spans are based on simple span joists. Low pitch 6 12 or less 14 15 roof span tables. Residential structural design vertical structural forces we were about to start learning about floor joist span tables.

Made of engineered wood substrate a renewable resource. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. Using floor joist span tables. The maximum span is measured o c.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Continuing on from part 1. View joist rafter tables. Of bearings and is based on uniformly loaded joists.