A load bearing wall building system consisting of U tracks and C vertical studs made of lightweight steel through a cold roll forming process. The profiles can then form external and internal walls, floor slabs and roofing frames. Produced in the factory to exact specifications each assembly, subassembly or individual component is delivered as a flat pack for on site assembly. Having a wider repertoire the production line can produce profiles of various length , width and thickness. This allows the architect and structural engineer a wider choice of components that make up the entire structure. Typically these structures offer quality, longevity, durability , strength, speed and considerable savings in execution.