How many steps per flight are recommended?

Not more than 12 and not less than 3

Where should a good stair be located?

Easily accessible, well lit and ventilated, not through rooms

2072 Asoj · 4 marks

Requirements of a good staircase

Short answer

Requirements: accessible location, width 0.9 m+ residential 1.5 m+ public, riser 150-175 mm tread 250-300 mm with 2R+T 580-600 mm, pitch 25-40 deg, 3-12 steps per flight, landings, headroom 2.0-2.2 m, strength/fire resistance, handrails 0.9 m, non-slip surface.

What are the requirements of a good staircase? Explain in brief.

Location: easily accessible, centrally placed, well lit and ventilated, and near the main entrance; not through rooms.
Width: residential at least 0.9-1.0 m, public buildings 1.5 m or more (as per NBC and local building bye-laws), so that two persons can pass.
Easy and safe ascent: riser 150-175 mm (public buildings not more than 150 mm), tread 250-300 mm; $2R + T$ about 580-600 mm; all steps in one flight equal.
Pitch: between 25 and 40 degrees.
Number of steps per flight: not more than 12 and not less than 3 steps.
Landings: provided at turns and between flights, width not less than the stair width.
Headroom: at least 2.0-2.2 m clear above every step.
Strength and fire resistance: strong enough for live load; material fire resistant, with a separate fire-escape stair in tall buildings.
Handrails and balustrades: about 0.9 m high, strong and safe for children.
Surface: non-slip treads, good lighting and ventilation, durable and pleasing in appearance.

✓ Answer checked by Claude Opus 5.5 (high effort)

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