Joists are open web light-weight steel trusses which act as secondary members in a structure, they are used to provide structural support for floors and roofs of buildings with long spans.
They possess an exceptionally high strength-to-weight ratio in comparison with other building materials. Furthermore, the open webs in the joists permit the ready passage and concealment of pipes, ducts and electric conduits within the depth of the floor. Upon arrival at the job site, the joists are ready immediately for proper installation.
