Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
Rafter span roof truss span tables.
Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Limited to span in inches divided by 360.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Deflection for 30 psf live load.
The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.
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.
View joist rafter tables.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
Let s consider a basic gable wood roof framing design.
For pitched roofs flat roofs and ceiling joists.
This rafter span calculator is species specific for douglas fir hemlock etc.
Span calculator for wood joists and rafters also available for the android os.
More roof calculators roof truss calculator how to cut rafters.
Also available for the android os.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
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.
To size joists and rafters use the maximum span tables for southern yellow pine.
Alpine truss designs are engineered to meet specific span configuration and load conditions.
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.
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.
Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11.
If you have a single sloped roof then the 11 span distance for 2 4 rafters o c.
Continuing on from part 3.
