I Joist Roof Rafter Span

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

I joist roof rafter span. View joist rafter tables. Dead load weight of structure and fixed loads 15 lbs ft 2. Span calculator for wood joists and rafters also available for the android os. These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.

1 ft 0 3048 m. While the heavy load span specs for a 2 4 rafter are much less than a light load they would allow you to have a shed. The loads are based on adjusted roof snow loads from the governing building code. 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.

An syp rafter can span 8. 1 psf lb f ft 2 47 88 n m 2. An syp rafter can span 11. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Live load is weight of furniture wind snow and more. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Rafter spans are tabulated for the most common roof loads. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Here we have a wood framed gable roof. 2 are indicated below. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Also available for the android os.

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. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Tables listing maximum spans for southern pine joists and rafters are detailed below.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Both of these are for light roof loads. Let s consider a basic gable wood roof framing design.