I Joist Roof Rafter Span

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

I joist roof rafter span.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. An syp rafter can span 11. Tables listing maximum spans for southern pine joists and rafters are detailed below. 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.

Span calculator for wood joists and rafters also available for the android os. 1 ft 0 3048 m. Rafter spans are tabulated for the most common roof loads. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013. If you live in an area that requires a shed roof rafter to support a heavy load then an spf rafter can only span 7. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. An syp rafter can span 8.

The loads are based on adjusted roof snow loads from the governing building code. Here we have a wood framed gable roof. 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. Live load is weight of furniture wind snow and more.

Let s consider a basic gable wood roof framing design. View joist rafter tables. 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.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. 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. 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. Continuing on from part 3.

1 psf lb f ft 2 47 88 n m 2. Dead load weight of structure and fixed loads 15 lbs ft 2. Both of these are for light roof loads.