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.
Roof truss span calculator.
More roof calculators roof truss calculator how to cut rafters.
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.
Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design 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.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Span calculator for wood joists and rafters also available for the android os.
Is a family owned and operated designer and manufacturer of wooden roof trusses in north central idaho.
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.
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.
The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.
It will use the current cost of wooden rafters based on the average price found at home improvement stores.
Also available for the android os.
Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
To size joists and rafters use the maximum span tables for southern yellow pine.