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Truss Shapes

triangle

Triangle

These trusses may be simple span, multiple bearing, or cantilevered. Where the truss height exceeds approximately 3m (10′), a piggyback system (see below) may be needed due to transportation restrictions.

Mono

This shape may be simple span, multiple span, or cantilevered. Top chord bearing is possible.

Inverted

The inverted truss is used to provide a vaulted ceiling along a portion of the span.

Cut-off (Bobtail, Stubend)

This shape may be used where a triangular truss will not fit.

Dual Slope

This truss provides an asymmetric roof slope.

Ridge Truss

The ridge truss provides a stepped roof appearance.

Piggyback

The piggyback truss is a combination of a gable end truss on top of a hip truss, which can be transported in two sections. It is used when a single triangular truss is too large to transport.

Attic

The attic truss provides useable area within the roof space.

Flat

The flat truss is used in roofs or floors. It may be designed as top or bottom chord bearing, or for simple or multiple spans. It may also be cantilevered at one or both ends.

Sloping Flat

This shape is used to create a vaulted ceiling. It may be top or bottom chord bearing.

Sloping Chord Flat

This shape is used to provide positive drainage to both sides of the building.

Mono Flat

The mono flat truss provides positive drainage to one side only.

Hip

This shape is used to create hip roofs.

Mansard

This truss is used to create a mansard roof profile.

Cathedral

The cathedral truss provides a vaulted ceiling along one portion of the span.

Vaulted

This truss is a variation of the cathedral shape.

Scissor

The scissor truss is used to create a vaulted ceiling along the entire span. The slope of the bottom chord is usually equal to 1/2 of the slope of the top chord. Large scissor trusses are often shipped in two pieces and field spliced.

Half Scissor

The half scissor truss provides a single-sloped vaulted ceiling.

Gambrel

This truss is used to create a gambrel or barn-shaped roof profile.