Ridge In Roof Truss

A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay.

Ridge in roof truss.

Height of rafter or top chord of truss. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. The more complex the truss framework is the greater quantity of these joints will be required. Once the decking and roofing are installed a truss roof looks just like a stick framed roof.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. Horizontal beams supported by posts and used to support the mid span of rafters to cover longer spans these are used in large buildings like the traditional large old barns in the us. Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam. The ridge board runs the length of the building and provides support for the tops of the rafters helping the whole roof structure work together as a system.

The same thing is true for the bridge of the truss. Trusses are set onto the walls of a house and are tied together with horizontal boards called purlins. These steel joints are needed to support the overall truss. One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads.

Fabricating roof and floor trusses for the southeastern united states and the caribbean since 1959. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.

Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. Roof truss parts explained. The ridge board must be set as perfectly as possible so take your time and use careful measurements. Height of roofing materials including plywood shingles and ridge vent on metal roof add height of purlin insulation if any metal roofing and ridge vent building with trusses and metal roof.

Since each truss is a complete frame trusses do not use a common ridge board and the purlins along with the roof decking provide lateral support.