How far can a parallel chord truss span?
The maximum span of a roof truss is approximately 90 feet.
What is a parallel chord truss used for?
Parallel chord trusses, also called girder trusses, are often used to support traditional trusses, rafters or purlins. They are extremely strong, so they can often span longer distances than traditional trusses. They are a good solution when trying to span a distance without needing a central supporting post.
How thick is a parallel chord truss?
Trusses also have to have a thickness. In low or no snow load areas, the trusses will be about an inch deep, for every foot of truss span, with a minimum thickness of about two feet.
How far can a floor truss span without support?
A floor truss can be designed to span 30 or more feet with ease. The truss manufacturer can build them so strong that there’s no bounce to the floor at all.
What is a parallel chord?
A sequence of chords consisting of intervals that do not change as the chord moves.
How does a Fink truss work?
The “fink” is a basic webbed truss design that provides the most economical roof solution. The web members form a ‘W’ to provide a high strength structure with good load-carrying capacity. The roof load is transmitted entirely to support on the wallplates.
What is the strongest type of roof truss?
No Single Strongest Truss No single style of truss is intrinsically stronger than another. The most common styles, Fink or W and Howe or K, along with a related type called fan, are the basis for most truss styles. All have angled top rafter chords and horizontal bottom beams or chords.
When to use a vaulted parallel chord truss?
Vaulted Parallel Chord Vaulted parallel chord trusses have an identical top and bottom chord pitch. This is achieved through a raised heel that allows for the webs to transfer loads through the truss to the bearings. Vaulted parallel chord trusses are used wherever a steep interior vaulted ceiling is desired.
How big is a parallel chord truss roof?
The pitch was 5/12 and the span was 22′. The depth of the truss was 24″. I created a dedicated air space under the roof deck using fiberboard sheathing, had wind wash barriers at the eaves. We then installed 22″ of blown insulation.
How is the chord size of a truss determined?
The chord size and web configuration are determined by span, load and spacing. All truss designs are optimized to provide the most economical configuration for the specific application. The parallel chord or flat truss gets its name from having parallel top and bottom chords.
How did the parallel chord get its name?
The parallel chord or flat truss gets its name from having parallel top and bottom chords. This type is often used for floor construction, but can also be used in roof applications. Standard Roof Truss Configurations
