Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Rafter span roof truss span tables.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
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.
Also available for the android os.
Deflection for 30 psf live load.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Continuing on from part 3.
Here we have a wood framed gable roof.
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.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
To size joists and rafters use the maximum span tables for southern yellow pine.
View joist rafter tables.
Let s consider a basic gable wood roof framing design.
Limited to span in inches divided by 360.
For pitched roofs flat roofs and ceiling joists.
Span calculator for wood joists and rafters also available for the android os.
The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.
If you have a single sloped roof then the 11 span distance for 2 4 rafters o c.
This rafter span calculator is species specific for douglas fir hemlock etc.
Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width.
More roof calculators roof truss calculator how to cut rafters.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
Alpine truss designs are engineered to meet specific span configuration and load conditions.
Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20.
