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Monday, June 28, 2021

REQUIREMENTS OF A GOOD STAIRCASE | HOMESLIBRO


REQUIREMENTS OF A GOOD STAIR

 

A.  The staircase location should be easy accessible from the different rooms of the building.

 

B. It should have adequate lighting and arrangements for proper ventilation.

 

C. It should have a suficient stair width to accommodate multiple people during peak hours or emergencies. Generally, the clear width for interior stairs is at least 500 mm in one- and two-family homes, 900 mm in hotels, 1.1 m in hotels, apartment buildings and industrial buildings and other types of apartments.

 

D. The number of steps in one flight should generally be limited to a maximum of 12 and a minimum of 3.

 

E.  Head room should be provided not only to prevent tall people from injuring their head, but also to give a feeling of spaciousness. Vertical clearance should never be less than 2.15 m.

 

F.  The size of risers and threads should generally be proportionate for comfort. The threads should be 250 -325 mm wide, excluding the nosing. Treads less than 250 mm in width should have a nosing of about 250 mm. The most comfortable height of the riser is 175-185 mm.

 

Generally the following formulas should be used

·       Product of riser and tread must be between 400 and 410.

·       Riser plus tread must equal 42.5–43.5 cm.

·       Sum of the tread and twice the riser must lie between 60 and 64 cm.

 

G. The width of the staircase depends on the purpose and importance of the building. In the case of residential buildings, it should be kept at 1 m.

 

H. The number of stairs required should be controlled over the maximum floor area contributing to a staircase. The number of people that can be served by stairs per floor per unit of 550 mm width of the staircase should be 15 for buildings such as hospitals and retirement homes, 30 for other institutional and residential buildings, 45 for storage buildings, 60 for shops, businesses, educational, industrial buildings, theatres and restaurants, 80 for churches, concert halls and museums, and 320 for stadiums and entertainment facilities.

 

I.    The minimum width of landing should be equal to the width of the stairs.

 

J.   The maximum and minimum pitch should be 40° and 25° respectively in any stairs.

 

K.  Winders should be provided at the lower end of the flight, only when it is essential. Generally, the use of winders in a staircase should be avoided.

 

L.  In open-well stairs in order to avoid the danger of accidents balustrade must be provided.

 

M.The live loads to be considered on stairs have been stipulated by IS:875-1964. The stairs and landings should be designed for a live load of 300 kg/m2 in buildings where there are no possibilities of overcrowding. In the case of public buildings and warehouse, where overcrowding is likely, the live load may be taken as 500 kg/m2.

REQUIREMENTS OF A GOOD STAIRCASE

 

ALSO READ: Staircase Components or Parts Details | Staircase Design 

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