4/30/2024 0 Comments Span table for roof rafters![]() To calculate the maximum spans of species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website. All tables assume no snow loads and a 1.25 Duration of Load adjustment has been applied. Description: Span tables for TJI ceiling joists supporting attic load and roof thrust load Document ID : tb-824 File Type: pdf File Size: 0.3 MB File Date. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc.) for these common lumber species, see the International Residential Code (IRC). The above spans are from the American Softwood Lumber standard sizes. ![]() Uninhabitable attics with limited storage, a live load of 20 Psf, a dead load of 10 Psf, and a deflection limit of L/240 Spans for rafters shall be in accordance with Tables 5802.5.1(1). ![]() ** Span is greater than 26 feet in length. refer to the AF&PA Span Tables for Joists and Rafters. Ceiling Joist Span Tables Uninhabitable attics without storage, a live load of 10 Psf, a dead load of 5 Psf, and a deflection limit of L/240 A span options calculator allows selection of multiple species and grades for comparison purposes. Joists and rafter spans for common loading conditions can be determined. Based on the following design requirements: an uninhabitable attic with limited storage has a live load of 20 Psf, a dead load of 10 Psf, and a deflection limit of L/240 (span in inches divided by 240). Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. Example: The highlighted cell (below) shows that a 2" x 6" Douglas Fir joist, with a grade of #2, spaced 24" apart, can have a maximum span of 10 feet - 8 inches (10-8).
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