Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> truncated truss

Truncated truss
In nailplate truss construction. A standard truss that has been truncated or has had it's top cut off. Usually to allow jack trusses to pass over it in hip roofs. The term girder is commonly applied as these trusses often act as a girder supporting the minor trusses abutting it.
Jack truss
In nailplate truss construction, a subsidiary truss that is fixed to a trunc-truss with its's top chord flying over it to reach the hip. Where not fixed to a trunc-truss it is fixed to a hip truss.

truncated trusses
Trunc. trusses laid out prior fixing.

truncated truss
jack truss

All the jack trusses in any one hip end have the same bottom chord and vertical member that abut the trunc. truss.

The difference is in the top chords, they come in pairs of varying lengths as do standard jack rafters.

As we go down the hip and leave the trunc. truss then the jack pairs have no vertical sections, just open ended chors and webs.

jack trusses
Jack trusses.

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