2x12 Roof Span

Rafter spans are tabulated for the most common roof loads.

2x12 roof span. Span calculator for wood joists and rafters also available for the android os. For example if building is 24 x 24 and has trusses and the load on the roof will be for 30 lb snow load and a ceiling with no storage will total out like this. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches. Wood beam calculator american wood council website rafter and joist span faq.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. 1 ft 0 3048 m.

A double 2x12 beam can span 12 feet. The load on an outside wall with clear span trusses is exactly half the load on each wall. Let s consider a basic gable wood roof framing design. 2 are indicated below.

For heavy roofs or in. The lengths and sizes of joists vary depending on the species and quality of the lumber used. 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. A 2 2x10 can span 10 feet and so on.

This will amount to twice as much load on the exterior walls compared to a building. View joist rafter tables. Also available for the android os. The loads are based on adjusted roof snow loads from the governing building code.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. The 1 grade. Live load is weight of furniture wind snow and more. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Here we have a wood framed gable roof. 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. Dead load weight of structure and fixed loads 15 lbs ft 2.

Maximum rafter spans for a patio roof. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Continuing on from part 3.

The numbers in gray indicate the distance between the support posts.