Roof Truss Span Calculator

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Roof truss span calculator.

Widely known for producing a quality product for over 20 years barlow truss provide any type of wooden roof truss you need. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. To size joists and rafters use the maximum span tables for southern yellow pine. More roof calculators roof truss calculator how to cut rafters.

The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. 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. It will use the current cost of wooden rafters based on the average price found at home improvement stores. 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.

Is a family owned and operated designer and manufacturer of wooden roof trusses in north central idaho. Also available for the android os. Span calculator for wood joists and rafters also available for the android os. Rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle.

This rafter span calculator is species specific for douglas fir hemlock etc. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. Alpine truss designs are engineered to meet specific span configuration and load conditions.

This online truss calculator will determine the all in cost of your truss based on key inputs related to the pitch width and overhang of your roof.