Profile: Sidewalk Shed is engaged in the business of renting scaffolding and selling safety netting. A sidewalk shed is a temporary bridge-like structure built over a sidewalk to protect pedestrians during construction on or near a building's façade. The necessity to erect such a sidewalk shed is dependent upon the height of the building being repaired, constructed or demolished and the horizontal distance between the structure and the inside edge of the sidewalk. Scaffolding is a temporary platform constructed for reaching heights above arms' reach for the purpose of building construction, maintenance, or repair. It is usually a modular system of metal pipes (termed tubes in Britain), although it can be made out of other materials. Scaffolding is generally made of lumber and steel which can range from simple to complex in design, depending on its use and purpose. The basic materials are tubes, couplers and boards. Its tubes are made of either steel or aluminum. If the tubes are made of steel, they are either black or galvanized. The tubes come in a variety of lengths and a standard diameter. The chief difference between the two types of tubes is the lower weight of aluminum tubes and their flexibility and so they have less resistance to force.