Open Truss Roof Structure

In essence a roof built on trusses is much more structurally sound.

Open truss roof structure.

The buckling resistance is obtained from bs en 1993 1 1 2 by applying a reduction to the resistance of the cross section. Trusses are gradually replacing the conventional rafters to the point that nowadays more than 80 percent of new residential construction uses trusses to support the roof. Because of the stability of this shape and the methods of analysis used to calculate the forces within it a truss composed entirely of triangles is known as a simple truss. The simplest form of a truss is one single triangle.

The benefit of a truss over older structural designs like coupled rafters is that it provides longitudinal support. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. Roof framing has undergone a quiet revolution over the past half century. A roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.

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. A roof truss is supported by the exterior walls and span the width of the building. Components of roof truss.