Pitched Roof Trusses

The pitched or common truss is characterized by its triangular shape.

Pitched roof trusses.

With rafters collars ties struts ridges underpurlins ceiling joists hanging beams combination hanging and strutting beams pitching plates and so on. Naturally this truss is used in buildings for creating a pitched roof. Roof trusses are engineered wood alternatives to hand framed rafters. They are designed at a 4 12 pitch to be spaced 2 foot on center.

These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. They support live and dead loads by efficiently transferring the loads to the building walls or supports. Its bottom chords join together at the apex creating a pitched or vaulted ceiling. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber.

Examples of live loads are snow wind rain and temporary construction loads. There are two basic methods of pitched roof construction. A pitched roof uses not only the external wall systems but also particular parts of the internal walls. Some common trusses are named according to their web configuration such as the king post fan fink or howe truss.

The chord size and web configuration are determined by span load and spacing. A pitched roof construction is the classic old school way of roof construction. A howe scissors truss is so called because its appearance resembles that of an opened pair of scissors.