Design of stairs

Recommended data for staircase

1). width of staircase

Domestic staircase ➔ 0.9 m = 900 mm

public staircase -> 1.5m = 1500 mm 

2). width of landing

Width of landing = width of staircase

if there is 2 flight b/w 1 floor, no of landing is 1.

            Stairs

3). flight

Length of flight depends on no of steps.

Minimum no of steps in a flight = 3

Maximum no of steps in a flight = 12

Angle of light with horizontal = 30°, 45°,60°

For best appearance & comfort ability, 45°

angle is best

4). Dimension of steps

Going → ≠ 25cm

for better comfort ==. 30cm

Nosing ➔ 10-25 mm

riser ➔ height of Riser in domestic building = 15 cm

Height of riser in public building = 10cm

Riser + going → 400 – 450 mm

riser + tread ➔ 500 – 550 mm