cwta.net

Shapes


truss



Some of the most common truss shapes are shown below using industry terminology.

Howe 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.

(Height - Width restrictions vary by location for shipping. Also plants can be limited by equipment. Some jobs may be built one piece & shipped with an escort.)
Fink
Triangular
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.
Usually stubbed at jogged exterior or at change to vaulted ceiling in opposite direction.
Dual Slope This truss provides an asymmetric roof slope.
Ridge Truss The ridge truss provides a stepped roof appearance.
Piggyback
(Three piece)
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.
Bottom Chord in centre designed as a floor.
Flat or Parallel Chord 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. They may be ordered with a built shallow slope to offset deflection and to provide positive drainage when used as a flat roof system.
Sloping Flat This shape is used to create a vaulted ceiling. It may be top or bottom chord bearing.
Double Sloping Chord Flat This shape is used to provide positive drainage to both sides of the building and is also referred to as a High Heel Common Truss.
Hip This shape is used to create hip roofs and is also referred to as a Step up Hip Truss.
Mansard with Parapets This truss is used to create a mansard roof profile.
Cathedral The cathedral truss provides a vaulted ceiling along one portion of the span.
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.
Gambrel This truss is used to create a gambrel or barn-shaped roof profile.