Span Data Lumber Roof Rafters

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Span data lumber roof rafters.

Syp 2 6 rafters at 24 o c. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 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.

Here we have a wood framed gable roof. The loads are based on adjusted roof snow loads from the governing building code. View joist rafter tables. Span calculator for wood joists and rafters also available for the android os.

Rafter spans are tabulated for the most common roof loads. Also available for the android os. An spf rafter can span nearly 15 at the same dimensions. Just enter the dimensions of the roof rise and run to get started.

You can always put your rafters closer together to achieve an even greater span. 1 ft 0 3048 m. 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. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Continuing on from part 3. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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.

Dead load weight of structure and fixed loads 15 lbs ft 2. Use 2 6 rafters if your roof will experience heavy snow or wind loads. Can span over 18 for gable roofed shed. Live load is weight of furniture wind snow and more.

Let s consider a basic gable wood roof framing design. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Western wood products association western lumber span tables base values for floor and ceiling joists and roof rafters for dimension lumber computed with.