The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
Span data lumber roof rafters.
The loads are based on adjusted roof snow loads from the governing building code.
Here we have a wood framed gable roof.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
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.
Span calculator for wood joists and rafters 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.
Dead load weight of structure and fixed loads 15 lbs ft 2.
Live load is weight of furniture wind snow and more.
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.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
View joist rafter tables.
Also available for the android os.
You can always put your rafters closer together to achieve an even greater span.
An spf rafter can span nearly 15 at the same dimensions.
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.
Rafter spans are tabulated for the most common roof loads.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
1 ft 0 3048 m.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Just enter the dimensions of the roof rise and run to get started.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
Use 2 6 rafters if your roof will experience heavy snow or wind loads.
Can span over 18 for gable roofed shed.
Western wood products association western lumber span tables base values for floor and ceiling joists and roof rafters for dimension lumber computed with.
Syp 2 6 rafters at 24 o c.
Continuing on from part 3.
Let s consider a basic gable wood roof framing design.
