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What is Stair?

by Swati


  • A stair may be defined as series of steps suitably arranged for the purpose of connecting different floors of a building. 
  • The enclosure of the building in which the it is located is known as a stair case.


  • The stairs should be suitably located in a building as it is the any means of communication between the floors, position to be allotted to the stairs in a building requires careful considerations depending upon the purpose in each case.
  • In residential buildings, the stairs should be centrally located to provide easy access to all the rooms.
  • While in public buildings, stairs should be located near the entrance.
  • In big buildings, there can be more than one stairs. 
  • If there are more than two, they should be well separated and positioned so as to afford the
  • easiest and quickest service possible to the people as a whole. 
  • Staircase should never be located around or adjacent to elevator shafts without solid walls between them. 
  • It is always advisable to place the staircase against a wall for economy of space, provision of light and ventilation and ease of construction.

Requirements of a Good Stair:

  • Stairs must be well planned and designed so as to provide an easy, quick and safe mode of communication between the various floors. 
  • Following are the general requirements which a it should fulfil:


  • A stair should be located in buildings in a position where there is both light and ventilation.
  • It should be so located as to provide easy access to the occupants of the building.
  • If possible, the stair should be located centrally so as to be easily accessible from the different corners of the building. 


  • One should construct it of sound materials and with good workmanship.

3.Width of stair: 

  • Width of the stair should be proper so as to carry user without much inconvenience. 
  • Width of stair case depends on its location and type of building.

4.Length of flight: 

  • A flight should not contain more than 12 steps or less than 3 steps to give comfort and safety.

5.Pitch of stair: 

  • The ascent and descent of a stair should be relatively easy and the proportions of going and rise should confirm to one of the following rules:
  • (Going in cm) + (2x Rise in cm) = about 60 cm 
  • (Going in cm) + (Rise in cm) = approximately 400 to 410 cm.

6.Head room: 

  • Unobstructed vertical height must be provided i.e. Adequate head room must be provided. 
  • It should not be less than 2.1 to 2.3 m so that even a tall person can use the stair with same luggage on its head. 

7.Step dimensions: 

  • The rise and going should be of such dimensions so to provide comfort to the users. 
  • Their proportion should also be such as to provide desirable pitch of the stair.
  • Going should not be less than 25 cm though 30 cm going is quite comfortable. 
  • The rise should be between 10 cm to 15 cm. 
  • The width of landing should not be less than the width of stair. 

8.Materials of construction: 

  • The material used for construction of stair should be such as to provide :
  • Good workmanship 
  • Sufficient strength
  • Fire resistance

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