The sfs framing is a construction technique with a “skeleton frame” of vertical steel columns and horizontal beams, built in a rectangular grid to withstand the floors, roofs and walls of a building that is attached to the frame. The development of this technique made possible the construction of the skyscraper.Many steel and steel machines are made of steel. The brown steel is a powerful one. Take a circle of 1 inch / 25mm wide. If you put this wall in peace on your roof, you can hang it 20,000 Kg (20 tons).