Raised Tie Roof Truss Spans

Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.

Raised tie roof truss spans.

44 raised tie roof construction up to 5m span rafter size tie joist h max span max 50 x 175 or 38 x 200 50 x 175 575 5000 38 x 175 38 x 175 450 5000 38 x 150 38 x 150 325. A raised tie roof truss is a truss where the bottom chord making up the triangle shape moves towards the top of the triangle. The raised tie roof truss design can go up against different style that when nitty gritty right can ooze a cutting edge feel. Typical roof truss design spans.

The truss has an internal web configuration shaped like a w to give the ultimate strength to material ratio for spans from around 5m to around 9m in span which covers the majority of domestic dwelling being built today. Unlike the conventional truss which is fully triangulated by virtue of its bottom chord fixing the top chords together the raised tie roof completes its triangulation at the flat ceiling to sloping ceiling intersection. Collar tie is a colloquial term for collar beam. A tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge because of wind or unbalanced roof loads.

First off the raised tie roof truss design is an extremely basic direct and utilitarian design every single current trademark. Mono used where the roof is required to. Main features raised tie roof truss design. These trusses are the solution when the internal ceiling height is required to be higher than that of the wall plate.

Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. Contact your localalpine trussmanufacturerorofficeformoreinformation.

Unlike other trusses which support on the ceiling tie the bottom chord raised tie trusses are supported partway up the lower end of the rafters. Rafter tie a tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. Building code limits the tie to the lower third of the distance between the plate and ridge consult irc table r802 5 1 for rafter span adjustment factors for rafter sizing with raised ties l rafter span w load on rafter l x rafter spacing x roof design load h height of ridge above plate h distance between tie and ridge.