It should have adequate lighting and adequate ventilation
It should have stairs of sufficient width to allow adequate access by persons due to excessive time or conditions. In general, the clear width for internal stairs should be at least 50 cm in one and two-family houses, 90 cm in hotels, motels, energy buildings and industrial buildings and 1.1 m for other production occupancies. .
The number in flight is usually limited to a maximum of 12 and a minimum of 3
Not to protect tall people from head injuries, but to provide enough room to give a feeling of spaciousness. Vertical clearance never less than 215 meters.
The size of risers and treads should generally be proportionate from a comfort point of view. Treads should be 25-32.5 cm wide, excluding the nose. Width less than 25 cm Treads nose approximately 25 cm area Riser most comfortable height 17.5–18.5 cm. Generally the following formula.
The width of the stairs depends on the purpose and importance of the building. In case of residential buildings it should be kept at 1 meter.
The required number of steps should be controlled on the maximum floor area of the staircase. Number of persons served by stairs per 55 cm unit of stair width per floor is 15 for buildings like hospitals and nursing homes, 30 for other institutional and residential buildings, 45 for storage buildings, commercial, Should be 60 for business. educational, industrial buildings, theaters and restaurants, 80 for churches, concert halls and museums, and 320 for stadiums and entertainment structures.
The minimum width of the landing should be equal to the width of the stairs.
Any stairs should have a maximum and minimum pitch of 40° and 25° respectively.
Winders should be provided at the lower end of the flight, when necessary. In general, the use of winders in stairs should be avoided.
Stairs in open wells should be provided with balustrades to avoid risk of accidents.
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