4/30/2024 0 Comments Rafter span tables deflectionTo learn more about framing a floor and general information on floor framing, visit Framing a Floor on. other loading conditions, refer to the AF&PA Span Tables for. 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. Load Deflection Limit of Span/360, Load Duration Factor of 1.00. deflection of the rafter below the rafter ties. 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 Joists supporting additional loads should be calculated by a competent person.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. 3 Roof Pitch Use recommended minimum roof pitches as specified by roof sheet supplier. Serviceability Deflection Limits o Dead Load: Span/300 o Wind Load: Span/300. These span tables make no additional allowance for partitions or any other loads additional loads. span tables for their applications 21 Econo Place, Silverdale, NSW 2752 P 1300 132 787 F 02 4774 2679. BS 5268-7.1 was published before BS 6399-1 was amended to include the more onerous 1.4 kN imposed concentrated load, so the approach adopted for these span tables uses the recommendations given in BS 6399-1, however, both approaches do result in similar joist sizes being calculated. Other span tables are based on the guidance given in BS 5268-7.1 which is a uniformly distributed load of 1.5kN/m² for spans greater than 2400 mm and 3.6 kN load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans. The floor joist span tables are based on the loadings given in the amended version of BS 6399-1 which is an imposed load of either a uniformly distributed load of 1.5 kN/m² or a concentrated load of 1.4 kN. Joists are to have minimum end bearing of 40mm. Wane as allowed in BS 4978:2007+A2:2017 is permitted in all sections included in these span tables. Proprietary strutting is to be used in accordance with manufacturers recommendations. Solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth.
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