A roof support system is composed of several components, including trusses, joists, rafters, beams, and tierods. A TRUSS is a triangular structure made of metal or wood that is used to support the roof. Joists are horizontal pieces of wood or metal that run from wall to wall and provide support for the roof. Rafters are sloped pieces of wood or metal that run from the ridge of the roof to the walls and provide additional support. Beams are large, heavy pieces of wood or metal that span across the roof and provide additional support. Tierods are metal rods that connect the trusses, joists, and rafters together to provide additional stability. All of these components work together to provide a strong and stable roof support system.