Light Gauge Metal Framing consists of thin sheet metal formed into shapes that can be used for wall studs, floor joists, roof rafters and truss members.  Light Gage Metal Framing is most commonly used for the construction of interior and exterior walls of commercial buildings.  Insulation, electric and plumbing can be easily installed within the floor and wall assembly with sheathing being applied directly to each face of the members.  Light Gauge Metal Framing can be utilized as a load supporting system typical of wood construction. With the increased strength, light gauge framing can  support more levels and span greater  distance in addition to being a non-combustible construction material.               
                                                                                            Link to Cold Formed Steel Engineers Institute