What is the minimum staircase width for an educational building?

1.5 m as per the minimum width provisions for means of egress.

When is a refuge area mandatory?

For buildings over 24m in height, the first refuge area is required at 24m or at the first accessible terrace, and then at every 15m interval thereafter.

What constitutes a Group A occupancy?

Residential Buildings, which are further sub-classified into lodging, one/two family dwellings, dormitories, apartments, and hotels.

Are fire sprinklers required in residential basements?

Yes, sprinklers are mandatory in basement areas exceeding 200 sq.m used for car parking or other services (Table 7).

NBC 2016 Part 4

: 2016

National Building Code of India 2016 - Fire and Life Safety

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Part 4 of the National Building Code of India 2016 provides comprehensive guidelines for fire and life safety in buildings. It covers the classification of buildings, fire zones, means of egress, and active and passive fire protection systems based on occupancy type and building height.

Provides comprehensive provisions for fire and life safety in buildings, including design, construction, occupancy, and fire protection systems.

Quick Reference Values

minimum staircase width residential1.25 m

minimum staircase width hospital2.0 m

minimum staircase width assembly2.0 m

occupant load residential12.5 sq.m/person

refuge area intervalevery 15 m height after initial 24 m

max travel distance educational22.5 m (Type 1 & 2 construction without sprinklers)

fire tower minimum width1.25 m

Practical Notes

Always calculate the occupant load (Table 5) first, as it dictates the required exit width and number of staircases.

High-rise buildings (15m or above) have stricter requirements including mandatory fire towers, refuge areas, and wet risers.

Basements require specific mechanical ventilation, smoke extraction systems, and must not be used to store hazardous materials.