Flat Trusses Roof Design

Roof trusses are engineered wood alternatives to hand framed rafters.

Flat trusses roof design.

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. Continue reading below our video of the day. As we will see below there are several different types of designs and this will impact the angles and designs of the overall truss. A flat truss is not necessarily flat as it slightly slopes to prevent the pooling of water on the roof and prevents the damaging or collapsing of the entire structure.

Flat trusses the flat truss can be designed as bottom or top chord bearing or for multiple and simple spans. To frame this style roof hip trusses are utilized from the main peak of the building stepping down with a flat top chord. Live loads are not always present. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.

Contractors and builders know. In this design each side of the building has a roof pitch and eave. In order to make this correctly you will have to work out exactly what you need to do with your truss in order to create a flat roof. The flat portion is increased the nearer the truss is to the end wall.

Pitched and flat roof trusses with average loading and spacing of 15 to 20 ft are infrequently used for spans in excess of 80 ft. Examples of live loads are snow wind rain and temporary construction loads. They support live and dead loads by efficiently transferring the loads to the building walls or supports. Economical spans are usually limited by the available sizes and lengths of solid sawed or glued laminated timber and by the potential capacity of the web member connections.

This can be cantilevered at one or both ends. Trusses must be designed for any special loading such as concentrated loads from hanging partitions or air conditioning units and snow loads caused by driftingnearparapetorslide offfromhigherroofs. A hip set is then used to frame the 6 or 8 feet nearest the end wall. To achieve maximum indicated spans trusses may require six or more panels.

The truss is a framework consisting of rafters posts and struts which supports your roof.