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.

Residential wood floor joist span table. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. View joist rafter tables. The spans are based on simple span joists. Low pitch 6 12 or less 14 15 roof span tables.

Joist span and spacing is set by your local building code. Floor joist span tables for various sizes and species of wood. Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.

True floor joist span calculations can only be made by a structural engineer or contractor. 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. 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. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

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. Continuing on from part 1. Residential structural design vertical structural forces we were about to start learning about floor joist span tables. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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. Uniform floor load plf tables 10 11 uniform roof load plf tables 12 13 roof span tables. Using floor joist span tables.

Span tables for joists and rafters 3 american wood council table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load. High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21. 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. The maximum span is measured o c.