Rafter Span Roof Truss Span Tables

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.

Rafter span roof truss span tables.

View joist rafter tables. Alpine truss designs are engineered to meet specific span configuration and load conditions. 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. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria. Span calculator for wood joists and rafters also available for the android os. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. More roof calculators roof truss calculator how to cut rafters. Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. Here we have a wood framed gable roof.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Deflection for 30 psf live load. Surveyors span tables for designing roof rafters. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.

If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. 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. This rafter span calculator is species specific for douglas fir hemlock etc. 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. 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. Let s consider a basic gable wood roof framing design.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Also available for the android os. For pitched roofs flat roofs and ceiling joists.