Open-web joists

Open-web joists

A lattice joist welded from light steel sections and mass-produced to certain standard lengths, used to support floor or roof loads.
References in periodicals archive ?
Open-web joists are considered ideal for floors and roofs in all types of buildings whether steel or concrete.
The prohibitions focus on restricting the use of scissor stairs, temporarily prohibiting the use of open-web joists, and restricting the use of oversized fuel oil transfer piping.