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Joist span table - use these span tables to determine maximum spans based on the species and grade of lumber, the size of the floor joists, the spacing of the floor joists, and either of these two common design scenarios: Live load of 30 PSF / a dead load of 20 PSF / and a deflection limit of L/360.
Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded and mechanically graded dimension lumber.
Floor Joist Span Calculator. To use the joist span calculator below, first select the species of lumber you will use for your construction project from the drop-down list. Next use the buttons in the table to select the maximum length in feet (or metres in brackets) that your floor joists must span.
range of values in the tables provides allowable spans for all species and grades of nominal 2-inch framing lumber customarily used in construction. 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,
Simply reference Span Tables for Joists and Rafters published by the American Wood Council (AWC). AWC’s Appendix A lists a variety of live and dead load combinations for floors, ceilings and rafters.
Floor Joist Span Tables - Use these tables to determine the maximum span of a floor joist, given the size, spacing, species, and grade of lumber.
SPFA has created 46 simplified maximum span tables based on common load conditions for floor joists, ceiling joists, and rafters for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. Review the joists and rafters span tables.
Floor joists are smaller horizontal pieces of wood that are placed in between beams to help evenly distribute weight. Article Sources. Learn everything you need to know about floor joist spans. This guide discusses floor joist spans, along with sizing, span tables, and types of wood.
Use this floor joist calculator to determine the number of floor joists you will need and how much they will cost. You can also use this calculator to determine the maximum allowable span a floor joist can be depending on its wood species, grade, size, and supported load.
Versa-Lam® laminated veneer lumber (LVL) beams and headers eliminate twisting, shrinking and splitting, and deliver flatter, quieter floors and structures while high-performance floors start with BCI® Joists—with 20% greater strength than comparably-sized dimensional lumber.