Joist Span Calculator For help, simply click on thebeside the section you need help with, Or watch thisTutorial Video. Lumber Species Beam Configuration Joist Size2x8 2x10 2x12 On Center Joist Spacing12" 16" 24" Overhang? Home> Joist Span Calculator...
These span tables assume installation of at least three joists or rafters that are spaced not more than 24" on center. The calculated spans assume fully supported members, properly sheathed and nailed on the top edge of the joist or rafter. Straight-line interpolation shall be permitted for ...
(8" -2) x 2 = 12' = maximum allowable span for a generic "deck floor joist" A look at an actual current joist span table will show that depending on the wood species, the allowable spans for a 2x8 floor joists with 40 pound live load with deflection limit of span/360, ranges fro...