Floor Joist Wood Beam Span Table

Span calculator for wood joists and rafters also available for the android os.

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. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches. 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. So the house dimensions will now be 24 x 13. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

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. Also available for the android os. Let s expand our house beyond that 17 2 span capability to 24 feet wide.