Timber Floor Joists Span Tables

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5.

Timber floor joists span tables. Click on a span to generate a full calculation you can adjust the exact span. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Straight line interpolation shall be permitted for intermediate spans and design values. Permissible clear spans for domestic floor joists to bs 5268 7 1 find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in.

The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. This span table is to the. View joist rafter tables. Timber floor joists shall be adequate for the spans and loads and be correctly installed.

These tables can also be used to determine deck joist span. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. 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. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

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.