Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> gang nail truss
The traditional idea of a roof truss (see Queen post truss) was to have a few heavy trusses spaced well apart supporting many rafters.
Smaller roofs are made without the use of trusses, by skilled roof carpenters using a collection of separate components like rafters, ridge boards, hip rafters, ceiling joists and ties.
The gang nail system replaced all that with individual lightweight trusses that took the position of each equivalent rafter.
Go to this link for further reading on this type of roof truss.
For more detail on how nail plate trusses handle valley construction go here.
Above are details of how the metal nail plate truss systems build hips, using trusses named after and copying the functions of hip rafters and jack rafters with hip trusses (in blue) and jack trusses (green) supported on one or more truncated girder trusses.
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"When we build, let us think that we build for ever."John Ruskin 1819-1900
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