Staircase and types of Staircase

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Requirement of Good Stair
1. Location :
• It should be so located as to provide easy access to the occupants of building
• It should be located that it is well lighted and ventilated directly from exterior.
• It should be located as to have approaches convenient and spacious.
2. Width of Stair:
• It Should be wide enough to carry the user without much crowd or inconvenience.
• Width of stair depends up to its location in the building and the type of the building
itself.
• In Domestic building 90 cm wide stair is sufficient
• In Public building 1.5 to 1.8 m width may be required.
3. Length of flight:
• From comfort point view, the number of steps are not more than 12 and not less than
3.
4.Pitch of stair:
• Pitch of stair should match with the French Theory “ The labor of moving vertically
is about twice that of moving horizontally” if the average human stride is taken as 23
inches.
• Pitch should however, be limited to 30 degree to 45 degree.

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5.Head Room:
The clear distance between tread and soffit of the flight immediately
above should not be less than 2.1m to 2.3m, so that even tall person can
use the stair with some luggage on its head.
6.Balustrade:
Open well stair should always be provided with balustrade, to provide
safety to the users. Wide stair should have hand rail to both sides.
7.Step Dimensions:
• The going should not be less than 25cm though 30 cm going is quite
comfortable.
• The Rise should be between 10 cm to 15 cm.
• Width of landing should not be less than width of stair.
8.Material of Construction: The material used for construction of stair
should be such as to provide sufficient strength and fire resistance.

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Stairs
Classification
Straight
Stair
Quarter turn stair
Half Turn (Dog-legged and open
well stair
Three-quarter turn stairs
Bifurcated stair
Continuous Stair
Turning
Stairs
Newel Stair
Well or Open newel Stairs
Geometrical Stairs

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