The space occupied by the stairs is called a staircase or stairwell. Various components of a stair are shown in Fig. 21.1 and also defined below.
1. Baluster
It is a vertical member supporting the handrail.
2. Flight
It is a series of steps without any break such as a platform, landing, etc.
3. Tread
It is an upper horizontal portion of a step used to keep the foot while ascending or descending.
4. Riser
It is a vertical portion of a step which provides support to the tread.
5. Step
It is a portion of the stair comprising of tread and riser.
Figure 21.1 Components of a staircase
6. Rise
It is a vertical length between the upper faces of any two consecutive steps.
7. Landing
It is a flat platform provided between the flights.
8. Winders
These are the tapering used for a change of direction in a stair.
9. Soffit
It is the under surface of a stair.
10. Going
It is the horizontal projection of the flight.
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