LIGHT STEEL STRUCTURES: Used in the production of single-storey, two-storey, three-storey, duplex and triplex houses, galvanized on steel, as a result of static calculations, starting from 0.50 to 2.5 mm thick, with a special form, welded from C, U and box profiles and They are structures manufactured by combining screws. Structures created by wearing insulation and contemporary coating materials on the steel frame are called LIGHT STEEL structures. HEAVY STEEL STRUCTURES: In the construction of multi-storey skyscrapers, large factories, workplaces, aircraft hangars, train stations, bus stations, large indoor fairgrounds, multi-storey car parks, multi-storey schools, using thick extruded NPI, NPU, expanded KASTELLA beams, bolted Structures prepared by combining welded and welded structures are called HEAVY STEEL STRUCTURES.