Anything beyond that you are looking at using 2x6s for most sheds.
Span roof rafters.
This calculator is to be used as an estimating tool only.
To size joists and rafters use the maximum span tables for southern yellow pine.
Click the button to calculate the stock size needed for this job.
The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size.
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.
Live load is weight of furniture wind snow and more.
The 1 grade.
As mentioned above a 2 4 spf shed roof rafter can span 11.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
More roof calculators roof truss calculator how to cut rafters.
An syp rafter can span 11.
If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11.
Dead load weight of structure and fixed loads 15 lbs ft 2.
Wood beam calculator american wood council website rafter and joist span faq.
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.
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.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
Also available for the android os.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
Span calculator for wood joists and rafters also available for the android os.
1 psf lb f ft 2 47 88 n m 2.
Both of these are for light roof loads.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
This rafter span calculator is species specific for douglas fir hemlock etc.
Rafter stock size calculator.
Input the rafter span on the flat eave overhang and pitch of the roof.
2 are indicated below.
1 ft 0 3048 m.
