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Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. These tables provide maximum spans for the #2 grades of four common species of lumber (Southern Pine, Douglas Fir, Hem-fir, and Spruce-pine-fir (SPF).
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.
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.
A complete analysis of wood’s mechanical properties is complex, but understanding a few basics of lumber strength will allow you to size joists and rafters with the use of span tables. Let’s start by taking a broad view.
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.
Enter lumber size, type of use, and span requirements in the Design Criteria section. Calculator generates the maximum span distance as well as the bending strength (F b), shear strength (F v) and bearing strength (F cp) values for each Stamp selected.
Span tables for visual and mechanical grades of southern pine lumber joists and rafters, and southern pine lumber and glue-laminated timber (glulam) headers, beams and girders. View SPC Span Tables.
Find span, joist, connections, height, and area calculators here. A span is the distance between two intermediate supports for a structure. Span tables are used to size joists and rafters.
Lumber Spans Quick Reference Card (U.S.) Author: Weyerhaeuser Subject: Handy card that lists floor, ceiling and rafter spans for Framer Series lumber, as compared to SYP and SPF. Created Date: 9/26/2018 12:32:11 PM
The table includes spans for common lumber species used for deck framing like southern pine, Douglas fir, hem-fir, redwood, western cedar and other species. The table accounts for wet service conditions and an incised lumber reduction for species commonly incised for pressure treatment penetration.