9.11.2

The basement shall have the following requirements -

a) Every basement shall be in every part at least 2.4 m. in height from the floor to the soffit of beam.

b) Adequate ventilation shall be provided for the basement with a ventilation area not less than 2.5% of the area of the basement. Any deficiency may be met by providing adequate mechanical ventilation in the form of blowers, exhaust fans or air-conditioning systems, etc.;

c) The minimum height of the ceiling of any basement shall be 0.9 m. and the maximum shall be 1.2 m. above the average surrounding ground level. However, it does not apply to the mechanically ventilated basements. In such cases, basement may also be allowed flushing to the average ground level;

d) Adequate arrangements shall be made so as to ensure that surface drainage does not enter the basement;

e) The walls and floors of the basements shall be water-tight and be so designed that the effect of the surrounding solid and moisture, if any, is taken into account in design and adequate damp proofing treatment is given. In case of special building, where, movement of fire fighting vehicle is proposed on the basement flushing to the ground level, the slab of the basement shall be designed to withstand the pressure of fire fighting vehicle.

f) The access to the basement shall be separate from the main and alternate staircase providing access and exit from higher floors. Where the staircase is continuous, the same shall be enclosed type serving as a fire separation from the basement floor and higher floors. Open ramps shall be permitted subject to the provision of Regulation No.9.12.

(1) Inserted / Substituted vide Notification u/s.37(1AA)(c) & 20(4) No.CR.97/2023/UD-13, dt.12th January, 2024