Pitched Roof Trusses

There are two basic methods of pitched roof construction.

Pitched roof trusses.

The pitched or common truss is characterized by its triangular shape. They support live and dead loads by efficiently transferring the loads to the building walls or supports. These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. A pitched roof construction is the classic old school way of roof construction.

They are designed at a 4 12 pitch to be spaced 2 foot on center. With rafters collars ties struts ridges underpurlins ceiling joists hanging beams combination hanging and strutting beams pitching plates and so on. Some common trusses are named according to their web configuration such as the king post fan fink or howe truss. A pitched roof uses not only the external wall systems but also particular parts of the internal walls.

Roof trusses are engineered wood alternatives to hand framed rafters. Naturally this truss is used in buildings for creating a pitched roof. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.

A howe scissors truss is so called because its appearance resembles that of an opened pair of scissors. Live loads are not always present. Examples of live loads are snow wind rain and temporary construction loads.