Span Data Lumber Roof Rafters

Can span over 18 for gable roofed shed.

Span data lumber roof rafters.

1 ft 0 3048 m. Just enter the dimensions of the roof rise and run to get started. Also available for the android os. 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.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. You can always put your rafters closer together to achieve an even greater span. 2 are indicated below. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

Rafter spans are tabulated for the most common roof loads. View joist rafter tables. If you re building rafters and aren t sure where to start when determining the length of your lumber you re in the right place our rafter stock size calculator shows you how long your rafters should be so you ll know what you need in terms of framing lumber dimensional lumber studs and more. Use 2 6 rafters if your roof will experience heavy snow or wind loads.

The loads are based on adjusted roof snow loads from the governing building code. Western wood products association western lumber span tables base values for floor and ceiling joists and roof rafters for dimension lumber computed with. An spf rafter can span nearly 15 at the same dimensions. Syp 2 6 rafters at 24 o c.

Live load is weight of furniture wind snow and more. 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. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Here we have a wood framed gable roof. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Let s consider a basic gable wood roof framing design. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

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. 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.