You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Diagram roof truss span calculator.
Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth.
Print full scale paper templates cut and fold over wood to mark and cut angles.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.
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.
Is a family owned and operated designer and manufacturer of wooden roof trusses in north central idaho.
Span calculator for wood joists and rafters also available for the android os.
These steel joints are needed to support the overall truss.
While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.
To size joists and rafters use the maximum span tables for southern yellow pine.
Alpine truss designs are engineered to meet specific span configuration and load conditions.
The more complex the truss framework is the greater quantity of these joints will be required.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
This rafter truss calculator has a range of applications including being used as a wood truss calculator roof truss calculator roof rafter calculator scissor truss calculator or for roof framing.
Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.
More roof calculators roof truss calculator how to cut rafters.
Hip roof framing calculator plan diagram with full dimensions.
Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.
Widely known for producing a quality product for over 20 years barlow truss provide any type of wooden roof truss you need.
The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.
Also available for the android os.
The same thing is true for the bridge of the truss.
Adjust to suit for a good straight fascia add an extra 20 mm or so to the tails of all your rafters total length.
This rafter span calculator is species specific for douglas fir hemlock etc.
