Rafter Span Tables - myCarpentry
Rafter Span Tables - Use these tables to determine lengths, sizes, and spacing of rafters based on several factors such as species, load, grade, and spacing. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for determining rafter lengths based on rise and run.
Rafter spans are tabulated for the most common roof loads. The loads are based on adjusted roof snow loads from the governing building code. For roof live loads less than 20 pounds per square foot (psf), rafter spans and required E values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol-lowing table:
Span Tables - Calculate Joist, Rafter and Wood Beam Spans
Rafter Span Tables - Use these tables to determine the maximum span of a rafter, given the size, spacing, species, and grade of lumber. Before determining the maximum spans for joists and rafters, you must know the load requirements for your region.
Span Options Calculator for Wood Joists and Rafters
Span Options Calculator for Wood Joists and Rafters Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. Joists and rafter spans for common loading conditions can be determined.
Joists & Rafters - SFPA - Southern Pine
Download SFPA’s Southern Pine Maximum Spans for Joists & Rafters which includes all 46 tables, explains how to use these tables, provides examples of how to read the table values, and other important information about the proper application of Southern Pine joists and rafters.
rafter span tables allowable spans in feet and inches #2 spruce-pine-fir nominal size o.c. ground snow load =30psf ceiling not attached. dead load =10psf ground snow load =30psf ceiling attached. dead load =10psf 12” 9-1 8-3 2 x 4 16” 8-2 7-6 24” 6-8 6-6 12” 13-9 12-11 2 x 6 16” 11-11 11-9 24” 9-9 9-9 12” 17-5 17-0 2 x 8 16” 15 ...
IRC Rafter Span Tables: The IRC provides 8 tables for rafter spans using common lumber species. Spans are measured as the horizontal distance between supports, including purlins. Each IRC table has separate sections for 10 psf and 20 psf dead load.
Designing with Roof Rafter Span Tables
On this page we will explain how to design with roof rafter span tables and how to read all types of joist and roof span tables for residential framing. This page is part of the Design Your Own House online tutorial.
RAFTER SPAN TABLE ALLOWABLE SPANS IN FEET & INCHES #2 Spruce-Pine-Fir NOMINAL SIZE O.C. Ground Snow Load=30psf Ceiling Not Attached. Dead Load = 10psf Ground Snow Load=30psf Ceiling Attached. Dead Load = 10psf 12" 9-1 8-3 2 X 4 16" 8-2 7-6 ... RAFTER SPAN TABLE Author: Donald R. Girton
How to Size Roof Rafters? | Explained with Examples!
Section R802.4 outlines the wood roof rafter framing criteria which also includes prescriptive span tables. In this post we will learn how to correctly size a roof rafter based on its span, spacing and species of wood used.
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