(1) The following provisions for minimum width of stairways shall be made:— TABLE I Category of Building Height of the Building (in metres).
Width of the Stairway (in metres).
No. of Staircase.
Residential Up to 8.00 1.00 1 Above 8.00 & Up to 11.00
1.2 1 Above 11.00 & Up to 14.50
1.35 1 Above 14.50 & Up to 18.00
1.25 2 Above 18.00 & Up to 24.00
1.25 2 Above 24.00 & Up to 36.00
1.25 2 Above 36.00 1.50 2 .
(2) For residential buildings of height above 14.5 m and upto a height of 24.00 m with not more than three tenements or 500 sqm. per floor (whichever is less), one staircase of 1.50 mtrs. of width may be permitted. If by any case the floor area or the number of tenements exceed the above value, the number of staircase should be increased as per the prescribed norms in table given below:—
PART I] THE KOLKATA GAZETTE, EXTRAORDINARY, FEBRUARY 14, 2007 43 TABLE II Category of building. , Area per floor.
.
Width of the Stairway (Mtr.).
Minimum Number Staircase of (Height upto
11.0 Mtrs.).
Minimum Number of Staircase (Height above
11.0 Mtrs.).
Educational Upt o 500 sqm. 1.35 2 2 Above 500 sqm. 2.0 2 2 Assembly Up to 500 sqm. 1.50 . 1 2 Above 500 sqm. 2.0 2 2 Institutional Up to 500 sqm. 1.50 1 2 Above 500 sqm. 2.0 2 2 Business Up to 500 sqm. 1. 50 1 2 Above 500 sqm. 1.50 2 2 Mercantile (Retail) Up to 500 sqm. 1.80 2 2 Above 500 sqm. 2.00 2 2
Provided that buildings for Marriage Hall, Banquet Hall, Multipurpose Hall shall have at least two number of staircase of any height and floor area.