This rafter span calculator is species specific for douglas fir hemlock etc.
Roof rafter span tables free.
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.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
Deflection for 30 psf live load.
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.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
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 follow ing table.
Let s consider a basic gable wood roof framing design.
Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
Surveyors span tables for designing roof rafters.
Continuing on from part 3.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
Also available for the android os.
Limited to span in inches divided by 360.
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.
Roof loads rafter spans are tabulated for the most common roof loads.
Here we have a wood framed gable roof.
Span calculator for wood joists and rafters also available for the android os.
To size joists and rafters use the maximum span tables for southern yellow pine.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
