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. A total of 46 span tables are provided for three types of framing members: floor joists, ceiling joists, and rafters. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc.) for these common lumber species, see the International Residential Code (IRC). these span tables have the final responsibility for determining if the load and design assumptions represent actual conditions for their specific applications. The above spans are from the American Softwood Lumber standard sizes. Member span is not suitable for rafter spacing greater than 600mm. Uninhabitable attics with limited storage, a live load of 20 Psf, a dead load of 10 Psf, and a deflection limit of L/240 Using span tables to size joists and rafters is a straight-forward process when you understand the structural principles that govern their use. Notes: 1) Refer to general notes for information that is relevant for all span tables. ** Span is greater than 26 feet in length. 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 Description: Span tables for TJIĀ® ceiling joists supporting attic load and roof thrust load Document ID : tb-824 File Type: pdf File Size: 0.3 MB File Date: October 2023 Document Types: Technical Bulletins & Resource Sheets Categories. 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). 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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