rolled steel joist 1.lightweight 2.easy to match ceilings 3.rust resistence and durable lightgate steel joist1.easy to match mineral fiber ceiling board,gypsum ceiling board and aluminum ceiling board2.with galvanized, the joist is anti-corruption, fire proofing3.High Carrying capacity, no distortion, no fracture ,safe and firm4.Fire resistance ,Water resistance,Moisture resistance, Corrosion ...