Span Tables - Calculate Joist, Rafter and Wood Beam Spans
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).
Span Tables - American Wood Council
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 …
Span Tables - SFPA - Southern Pine
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. Review the joists and rafters span tables.
Use of these span tables requires reference to the applicable design values for the various species and grades of lumber. Tables W-1 and W-2 of Design Values for Joists and Rafters, a supplement to these span tables, provide such values for them ostc ommonly used framing sizes. Modulus of elasticity (E), bending design values (F b
Tutorial for Understanding Loads and Using Span Tables
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.
Span Tables & Design Values for Joists, Rafters, Headers, Beams …
Southern Forest Products Association Span Tables. 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.
Wood frame construction design relies on the lumber design values and allow-able span tables published in building codes and stan-dards, and industry technical publications. The most commonly used lumber species groups are Douglas Fir-Larch, Hem-Fir and Southern Pine grown in the U.S. and Canadian Spruce-Pine-Fir.
Southern Pine Span Tables. Tables 1 through 12 are abbreviated span tables for selected Southern Pine visual, Machine Stress Rated (MSR) and Machine Evaluated Lumber (MEL) grades. These tables are intended for use under dry-service conditions.
Headers & Beams : Size Selection Tables - Southern Forest …
SFPA provides size selection tables for various beam spans and loading combinations for Southern Pine dimension lumber and glulam.
EXCERPTS FROM TABLE 2308.10.2(2) C.B.C. CEILING JOIST SPANS FOR COMMON LUMBER SPECIES (Uninhabitable Attics With Limited Storage, Live Load = 20 pounds per square foot, L/∆ = 240) a. Span exceeds 26 ft in length. Check sources for availability of lumber in lengths greater than 20 ft.