Floor Joist 4x4 Beam Span Table

The numbers in gray indicate the distance between the support posts.
Floor joist 4x4 beam span table. Span calculator for wood joists and rafters also available for the android os. These span tables are calculated based on moe and fb values. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. A double 2x12 beam can span 12 feet.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. A 2 2x10 can span 10 feet and so on. Three or more load sharing members such as joists rafters or studs are spaced no more than 24 apart and are joined by floor ing sheathing or other load distributing elements.
These tables can also be used to determine deck joist span. View joist rafter tables. 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. Dimensional lumber deck beam span chart.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Design properties 16 floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
Also available for the android os. Span tables for domestic floor joists to bs 5268 7 1 note. 2 and better southern pine or douglas fir joist. 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.
Beam may be solely responsible for. 2x6 if joists are spaced. 2x6 if joists are spaced. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.