Rafter Span Roof Truss Span Tables

View joist rafter tables.

Rafter span roof truss span tables.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.

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. Also available for the android os. Deflection for 30 psf live load. 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.

Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width. This rafter span calculator is species specific for douglas fir hemlock etc. Limited to span in inches divided by 360. Alpine truss designs are engineered to meet specific span configuration and load conditions.

Continuing on from part 3. Here we have a wood framed gable roof. Surveyors span tables for designing roof rafters. To size joists and rafters use the maximum span tables for southern yellow pine.

Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Let s consider a basic gable wood roof framing design. 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.

More roof calculators roof truss calculator how to cut rafters. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. For pitched roofs flat roofs and ceiling joists.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.