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.

Most common size of roof rafter is 2″×6″, 2″×8″, 2″×10″, 2″×12″ and 2″×14″ are used in roof framing. Thickness of rafter should be not less than 2 inches and their depth should be range from 4″ to 12″. Length of Rafter depending on climatic condition, style, slope and type of structure.

In this post we will learn how to correctly size a roof rafter based on its span, spacing and species of wood used. Fun Tip: To learn the difference between the International Residential Code (IRC) verses the International Building Code (IBC), be sure to check out this POST.

Rafters commonly span longer distances than joists, so it’s best to check your local building code to make sure the timber selected fits all the span factors. An SS-Douglas fir 2×6 rafter can span 18’-0” at 12” O.C., no ceiling, and a live and dead load each of 20psf.

Dec 26, 2023 · How far can 2x6 rafters span? Find the maximum span length for 2x6 rafters based on your roof pitch, load, and other factors. Get expert advice on how to choose the right size rafters for your project.

Learn about 2x6 roof rafter span, factors affecting it, installation guidelines, and design considerations for a sturdy and safe roof structure.

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.

Douglas fir maximum horizontal roof rafter span for Lumber Grade Selected Structural and No. 1 and No. 2, are indicated below. Max. dead load (weight of structure and fixed loads) 15 lbs/ft 2 . Live load is weight of furniture, wind, snow and more.

A 2×6 rafter can span 14 feet 8 inches when spaced 16 inches apart with No. 1-grade southern pine lumber on a roof with a 3/12 slope or less with a maximum live load of 20 pounds per square foot and a dead load of 15 psf.

Apr 6, 2024 · This article provides comprehensive insights on the standard spacing for 2x6 rafters to ensure structural integrity in roof construction.