Fink Roof Truss Span

Alpine truss designs are engineered to meet specific span configuration and load conditions.

Fink roof truss span.

In a hip roof. The fink truss can also be used as a support for other trusses by doubling or trebling the number of plies i e. The same thing is true for the bridge of the truss. The howe configuration is primarily used in girder trusses which support on coming trusses when there are no load bearing walls available.

These will be your most common truss designs. Parts of a truss framed roof gable end valley set gi rde t u s dutch hip girder dutch hip framing stepdown hip framing end jack stepdown girder stepdown truss c om n. 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. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

I would guess that you have fink. The fink truss bridge was patented by albert fink in 1854. I m just saying that in general trusses are designed to span from outside wall to outside wall. Semi rigid pitch breaks with fixed heels member end fixity model was used in the analysis and design of this truss.

Due to its design flexibility the fink truss is the most frequently used truss in roof design. The 6 4 truss can span similar spans as the fan double w trusses but tend to be the most cost effective web configuration for trusses spanning over 10m as the timber sizes can remain smaller. With a large variety of spans up to 14 metres and pitch range from 10 to 60 the finks truss offers a cost. Unbalanced roof live loads have been considered for this design.

In a fink truss the internal joists are arranged in a w shape ensuring even weight distribution from one end to the other. Take a camera into the attic and take pictures of the trusses in question. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. Fink trusses were originally invented for the purpose of beefing up bridges but many contractors now use them to increase the strength of interior structures.

1 grade yellow pine. 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. If they are a standard fink truss w shape or a howe truss then it should be perfectly safe. Designed in accordance with the 2015 international residential code sections r502 11 1 and r802 10 2 and referenced standard ansi tpi 1.

The more complex the truss framework is the greater quantity of these joints will be required. Albert fink designed his truss bridges for several american railroads especially the baltimore and ohio and the louisville and nashville the 1865 annual report of the president and directors of the louisville and nashville railroad company lists 29 fink truss bridges out of a total of 66 bridges on the railroad. These steel joints are needed to support the overall truss. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.