Several types of steel framing are used in the construction of light buildings. One example is wall-bearing framing, which allows the weight of a building to be carried on both its exterior and interior walls, as it is in residential houses. This method is used in buildings of three stories or less. A skyscraper is constructed with a steel skeleton framework that supports the weight of the entire building. Credit for inventing this type of structure is usually given to William Le Baron Jenney, who planned the Home Insurance Building constructed in Chicago during 1884-85.
Cantilevers overhang the sides of walls and distribute and balance loads on the opposite sides.
This restrains them from twisting under extreme heat. A steel framework is joined together by bolting, riveting, or welding. A new method permits the pieces to be joined by fasteners that interlock and are sealed by the blows of a hammer. Cranes and derricks are used to lift the steel beams and other materials to various floor levels. Some derricks are fastened to the structures and jumped, or repositioned, through a process by which the derrick lifts itself to the floor above.