To learn more about framing a floor and general information on floor framing, visit Framing a Floor on . Tables listing Maximum Reaches for Southbound Pine joists and rafters are detailed below. A total of 46 span tables are provided for three types of framing members: floor joists, ceiling joists, and rafters. To calculate maximum spans on species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc.) for these species of framing lumber, see the International Residential Code (IRC). The above spans are based on American Softwood Lumber standard sizes. Floor Joist Span Table Live Load = 30 PSF, Dead Load = 20 PSF Also see Assumptions for Table Development. See Using These Tables and Design Assumptions for additional information. For each application, a PDF download is available. Simplified maximum span tables to selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. The spans in these tables were determined on the same basis as the code-recognized Span Tables for Joists & Rafters and Wood Structural Design Data, both published by the American Wood Council concentrated loads and uplift loads caused by wind were not considered. Floor Joist Span Diagram How to use the Span TablesĮxample: In the joist span table below, the highlighted cell (10-5) indicates that a #2 grade 2" x 8" Douglas Fir joist, spaced 24" apart, can have a maximum span of 10 feet - 5 inches (10-5) if designing for a live load of 40 PSF, a dead load of 10 PSF, and a deflection limit of the total span in inches divided by 360. Tables providing allowable floor loads (C D 1.0) and allowable roof loads (C D 1.15 and C D 1.25) for Southern Pine dimension lumber and Southern Pine glued laminated timber are detailed below.
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