Abstract: A joist assembly system that provides dynamic retrieval of components, dynamic and precise positioning of retrieved components, assembly of the components to form a joist, and delivery of the assembled joist. The joist assembly system has a plurality of material handling systems, a plurality of welding systems, and a rigging table system. The material handling systems position two or more webs with respect to the first chord and the second chord at the rigging table system. Subsequently, the plurality of welding systems weld the two or more webs to the upper chord and the lower chord to form the joist. The material handling systems and the welding systems are configured to move longitudinally and/or laterally with respect to the rigging table system using upper and/or lower transport systems. The upper transport system may be supported by ceiling supports in the floor and/or roof above the rigging table system.