Residential Wood Floor Joist Span Table

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

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. High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. 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. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

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. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. True floor joist span calculations can only be made by a structural engineer or contractor. 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.

Of bearings and is based on uniformly loaded joists. View joist rafter tables. 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. Using floor joist span tables.

Continuing on from part 1. The maximum span is measured o c. Made of engineered wood substrate a renewable resource. Residential structural design vertical structural forces we were about to start learning about floor joist span tables.

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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Joist span and spacing is set by your local building code. 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. The spans are based on simple span joists. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. Span tables for domestic floor joists to bs 5268 7 1 note.