A truss is a load-bearing structure that consists of materials being formed into connected triangles to enable the even distribution of weight. These are most commonly used in bridges, roofs, and tower buildings, but you find trusses in many different applications. Truss builders use wood and metal to design and build trusses that meet the needs of their project. In this role, your job duties include assembling pre-cut wood or metal pieces into the triangular structure, either by hand or using an overhead crane. Once the pieces are in place, you reinforce the connecting joints with metal plates, then measure each part again for accuracy to ensure the structure can provide the necessary support for the bridge or building.