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A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
The most common alloy used for aluminium tread plate is 6061, although 5086-H34 and 3003-H231 are also used. [1] Diamond plate is usually steel, stainless steel or aluminium. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design. [citation needed]
American building codes, while varying from State to State and County to County, generally specify the following parameters: [35] Minimum tread length, typically 10 inches (254 mm) excluding the nosing for private residences. [36] Some building codes also specify a minimum riser height, often 5 inches (127 mm). [37]
Good lighting is important in a staircase so users see where they are going and to prevent falls. [6] There is often a window on the wall to let in daylight.In many cases, indoor stairs are placed far inside the building structure, and it is often not easy to get access to a wall on the outside where it would be natural to have a regular window for letting daylight in.
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