Dead load weight of structure and fixed loads 15 lbs ft 2.
Roof rafter span fir 3x8.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
Here we have a wood framed gable roof.
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.
To size joists and rafters use the maximum span tables for southern yellow pine.
This rafter span calculator is species specific for douglas fir hemlock etc.
Let s consider a basic gable wood roof framing design.
1 psf lb f ft 2 47 88 n m 2.
Live load is weight of furniture wind snow and more.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
For each application a pdf download is available.
Also available for the android os.
Span calculator for wood joists and rafters also available for the android os.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
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.
1 ft 0 3048 m.
Span calculator for wood joists and rafters also available for the android os.
2 are indicated below.
Continuing on from part 3.
Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.
While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
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.
