I Beam Floor Joist Span Table

The above spans are based on american softwood lumber standard sizes.

I beam floor joist span table.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Live load deflection is limited to l 480 for better performance. For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.

Let s say our house is 24 x 26. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. They are ideal for long spans including continuous spans over intermediate supports.

Bci joists are specially constructed floor i joists with flanges made from strong versa lam lvl. I joists are used extensively in residential floor and roof framing. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. Our floor joist beam can span a maximum of 13. In the table above the widest floor beam span for 12 of supported floor joists is 14 7 if using a 5 ply 2 x 12. These span tables are based on uniform loads as noted above.

This application will specify a list of acceptable jji joists once you enter your support conditions load case and clear span. Floor joist maximum spans span illustrations simple span 1. Interactive span table if you are considering using jji joists in your construction project use our interactive span table to quickly identify the size and specification that you will require. Span tables for domestic floor joists to bs 5268 7 1 note.

Due to variations in timber grades load sets support conditions and bearing widths the tables are not suitable as a design tool. Bci joist span and size charts available for download. Floor performance is greatly influenced by the stiffness of the floor joists.