THE SCAFFOLDING As our company knows well, it is a reticular structure usually provided with decks. Until the early twentieth century the supporting structures they were made of structural wood (among the most famous scaffolding we remember the one made by Michelangelo for the construction of the dome of St. Peter's Basilica in the Vatican). While the modern ones are almost all made of steel and sometimes aluminum. Steel scaffolding can belong to one of the following three systems required by current Italian regulations : JOINT PIPE SYSTEM Better known as Innocenti tube scaffolding (so called from the name of the inventor Ferdinando Innocenti), very versatile and suitable for any type of use, but more laborious to assemble. PREFABRICATED FRAME SYSTEM Designed for use on linear building facades. SYSTEM WITH PREFABRICATED UPRIGHTS AND CROSSBARS They can be multidirectional or multi-storey, quite flexible and generally suitable for the construction of three-dimensional structures.