Rafter Span Roof Truss Span Tables

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.

Rafter span roof truss span tables.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Alpine truss designs are engineered to meet specific span configuration and load conditions. This rafter span calculator is species specific for douglas fir hemlock etc.

Continuing on from part 3. 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. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Let s consider a basic gable wood roof framing design. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value. To size joists and rafters use the maximum span tables for southern yellow pine. More roof calculators roof truss calculator how to cut rafters.

If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. 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.

For pitched roofs flat roofs and ceiling joists. 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. View joist rafter tables. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria. Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. Span calculator for wood joists and rafters also available for the android os. 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.

Surveyors span tables for designing roof rafters. Here we have a wood framed gable roof. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.