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Straight Stairs. Spiral stairs. Handrails. Railings. Landings.
Stairs. Stairway, stairwell, flight of stairs or just stairs are all names for a structure that bridges the gap between floor levels of different elevations. Stairs may be straight, spiral, or may consist of two or more straight pieces connected at angles by means of landings.
For safety reasons, stairs have to have certain measurements in order for people to comfortably use them. Building codes will typically specify certain measurements for tread length, riser height and nosing protrusion to ensure hat the stairs are not too steep or narrow.
The code also regulates the height of the handrail and diameter, maximum space between the balusters, number of steps for each section, etc.
Spiral stairs. A tight spiral stair with a central pole is very space efficient in the use of floor area. A user of these stairs must take care to not step too close to the central pole as it becomes more likely that one or more steps may be missed, especially when going down. Using the handrail will also direct the user to the safer outer portion of the treads.
Landings. Most modern stairs incorporate at least one landing. "L" shaped stairways have one landing and usually change in direction by 90 degrees. "U" shaped stairs may employ a single wider landing for a change in direction of 180 degrees.
Oak stairway with two landings