Continuing on from part 3.
Roof rafter span fir 3x8.
1 psf lb f ft 2 47 88 n m 2.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
1 ft 0 3048 m.
Span calculator for wood joists and rafters also available for the android os.
This rafter span calculator is species specific for douglas fir hemlock etc.
To size joists and rafters use the maximum span tables for southern yellow pine.
Dead load weight of structure and fixed loads 15 lbs ft 2.
Let s consider a basic gable wood roof framing design.
More roof calculators roof truss calculator how to cut rafters.
Here we have a wood framed gable roof.
Live load is weight of furniture wind snow and more.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
2 are indicated below.
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.
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.
For each application a pdf download is available.
Also available for the android os.
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.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.
Span calculator for wood joists and rafters 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.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
