Flight is the length of the stair case between two landings. It is the sloping and portion (slab) of the stairs. The number of steps in a flight varies from 3 to 12.
Landing is the intermediate, horizontal portion provided in a staircase. It’s provided for relaxing while climbing and entering or exiting a stair case.
The vertical height of a step is called rise or riser. It varies from 150mm to 180mm for residential building and 120 to 150mm for public building.
The horizontal distance between two risers on a step is called as tread. The width of a tread is kept as 200mm to 250mm for residential building and 200 to 300mm for public building.
Going and Nosing:
The horizontal distance between two risers is known as going and the portion projecting out from the riser surface is called as nosing. Nosing is provided when the available horizontal distance for a tread is less.
It is the clear height available between one flight and other above it.
It is the bottom surface of the waist slab.