Rafter Span Roof Truss Span Tables

To size joists and rafters use the maximum span tables for southern yellow pine.

Rafter span roof truss span tables.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. View joist rafter tables. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. More roof calculators roof truss calculator how to cut rafters. This rafter span calculator is species specific for douglas fir hemlock etc. 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 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. Let s consider a basic gable wood roof framing design. Here we have a wood framed gable roof. Deflection for 30 psf live load.

Continuing on from part 3. 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. Limited to span in inches divided by 360. Also available for the android os.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Span calculator for wood joists and rafters also available for the android os. If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.

Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. Surveyors span tables for designing roof rafters. Alpine truss designs are engineered to meet specific span configuration and load conditions. Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. For pitched roofs flat roofs and ceiling joists. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.