Stringer board, stringer, or sometimes just string::The structural member that supports the treads and risers in standard staircases. There are a number of different styles and uses of feature tread. A double ended feature tread can be used when both sides of the stairs are open. Handrails that simply end at a post at the foot of the stairs can be less sturdy, even with a thick post. Besides the cosmetic appeal, starting steps allow the balusters to form a wider, more stable base for the end of the handrail. When the starting step is rounded, the balusters typically form a spiral around the circumference of the rounded portion, and the handrail has a spiral called a "volute" that supports the top of the balusters. Starting or feature tread: Where stairs are open on one or both sides, the first step above the lower floor or landing may be wider than the other steps and rounded. They provide additional length to the tread without changing the pitch of the stairs. Many building codes require stair nosings for commercial, industrial, or municipal stairs. If it is present, this means that, measured horizontally, the total "run" length of the stairs is not simply the sum of the tread lengths, as the treads overlap each other. Nosing: An edge part of the tread that protrudes over the riser beneath. This may be missing for an "open" stair effect. Riser: The vertical portion between each tread on the stair. 
The "width" is measured from one side to the other. The tread "depth" is measured from the back of one tread to the back of the next. It is constructed to the same specifications (thickness) as any other flooring.
Tread: The part of the stairway that is stepped on. Steps with 2 anti-slip rubber lines and small nosingsĮach step is composed of a tread and a riser. "Stairway" is also a common metaphor for achievement or loss of a position in the society or as a metaphor of hierarchy (e.g. Stairs are also a subject used in art to represent real or imaginary places built around impossible objects using geometric distortion, as in the work of artist M. Stairs may also be a fanciful physical construct such as the "stairs that go nowhere" located at the Winchester Mystery House. Stairs are also provided for convenience to access floors, roofs, levels and walking surfaces not accessible by other means. Stairs may be a required component of egress from structures and buildings. Many variations of geometrical stairs may be formed of circular, elliptical and irregular constructions. Stairs may also return onto themselves with 180 degree angle landings at each end of straight flights forming a vertical stairway commonly used in multistory and highrise buildings. Stairs may change direction, commonly by two straight flights connected at a 90 degree angle landing. Stairs may be in a "straight run", leading from one floor to another without a turn or change in direction. Box stairs are stairs built between walls, usually with no support except the wall strings. A stair hall is the stairs, landings, hallways, or other portions of the public hall through which it is necessary to pass when going from the entrance floor to the other floors of a building. A stairwell is a compartment extending vertically through a building in which stairs are placed. A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades and additional parts. A stair flight is a run of stairs or steps between landings. In buildings, stairs is a term applied to a complete flight of steps between two floors. ( January 2018) ( Learn how and when to remove this template message)Ī stair, or a stairstep, is one step in a flight of stairs. Unsourced material may be challenged and removed. 
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