Floor Joist Wood Beam Span Table

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

Floor joist wood beam span table.

The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c. Floor joist span tables for surveyors floor construction. This should be compared to the table. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Let s expand our house beyond that 17 2 span capability to 24 feet wide. Also available for the android os. You need to measure the complete span of your floor joists together with the distance between them the centres and the size of the timbers. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

So the house dimensions will now be 24 x 13. Span tables for domestic floor joists to bs 5268 7 1 note. 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. Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than 2400 mm and 3 6 kn load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans.

Beam and joist span tables built up wood floor beams supporting one floor in a house maximum spans for uniformly distributed loads species and grade supported built up beam size joist length 3 2x8 4 2x8 3 2x10 4 2x10 3 2x12 4 2x12 8 9 8 11 2 11 10 13 8 13 8 15 10 10 8 8 10 0 10 7 12 2 12 3 14 2. Span calculator for wood joists and rafters also available for the android os. 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.

The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value. View joist rafter tables.