What is a roof truss? A truss is a structure with straight pieces forming triangles to support a load. The members of the triangles are placed under tension and compression but do not bend.
However, if a greater number of identical trusses can be manufactured, then considerable economies of scale can be achieved. The structural height of a truss is usually larger than the height of similar structures using solid beams. For roofs, however, this is usually no disadvantage as roofs must often – depending on roof cover material used – be higher at the ridge and lower at the eaves to facilitate roof drainage and ensure water tightness.