| PARTS
OF BUILDING
(35)
Mezzanine floor -
(1) The floor area of
mezzanine floor shall not exceed one-third area
of the main floor or room accommodating the mezzanine
floor.
(2) The headroom measured
from the surface of the floor to any point on
the underside of the mezzanine floor shall not
be less than 2.2 metres.
(36)
Height of floor for office or business buildings
-
The
height of the floor measured from the surface
of the floor to the underside of the beam or ceiling
of the upper floor shall not be less than 3 metres.
(37)
Water closet -
Every
building shall be provided with at least one water
closet.
(38)
Size of bathroom and latrine
(1) The area of bathroom
shall not be less than 1.50 Sq. metres with either
side not less than 1.1m, carpet area of a latrine
shall not be less than1.10 sq. metres with one
side not less than 1.0 metres;
Provided
that the area of combined bathroom and latrine
shall be not less than 2.2 sq. metres with
one side not less than 1.1 metres.
(2) The average height
of bathroom and or latrine measured from the floor
to the ceiling shall be not less than 2.5 metres;
Provided
that the headroom at any point in the bathroom
and or latrine shall be not less than 2.2 metres
(39)
Staircases
1.
Any building having more than four floors
including basement or sunken floors shall have
at least two staircases, one of which may be an
external stairway.
Provided
that when the second staircase provided as external
stair way confirms to the provisions of fire escape
staircases, a separate fire escape stair need
not be provided.
Note:
- an external stair is one, which is connected
to public areas and or common areas on all floors
and leads directly to ground, has at least two
sides abutting external wall, these two sides
being provided as open or with break open glass
and has landing areas accessible from the external
side or a external stair which wholly open and
removed from the main building, such an external
stair can be removed and away from the main stairway.
2.
2. The minimum width of stair shall
be not less than 1.20 metre for all buildings
other than single or double family dwelling houses.
3.
The minimum width of stair shall not be
less than 1.20 metre for all buildings other than
single or double family dwelling houses.
4.
The height of riser shall not exceed 15
cms for all buildings other than single or double
family dwelling houses.
5.
The height of handrail shall be not less
than 9 cms.
6.
The width of passages giving access to
the staircases in any building shall not at any
point be less than the width of the stair.
(40)
Ramps
Ramps
if provided, as a substitute for stairway shall
be laid with a slope not exceeding 1 in 10 and
such ramp shall comply with requirements of a
stairway and shall be surfaced with approved non-slippery
materials.
(41)
Corridor, verandas, and passageways
The
clear width of any corridor, veranda, or passageway
in any building shall be not less than 1.0 metre
at any point.
(42)
Fire escape staircase
(1) Fire escape stair
case shall be provided for every buildings of
(a) Residential occupancies
exceeding three storeys above ground level;
(b) (b) Occupancies other
than residential exceeding two storeys above ground
level
(2) The width of fire
escape staircase shall not be less than 75 cms,
the width of the fire escape tread shall be not
less than 15 cm, the height of the fire escape
stair riser shall not exceed 19 cms, and the number
of riser shall not exceed 16 per flight of stairs.
(3) The height if handrail
of a fire escape staircase shall not be less than
100 cms.
(4) Fir escape stair
shall be constructed only in the exterior of the
building and shall be connected directly to the
ground.
(5) Fire escape stairs
shall have a straight flight.
(6) Entrance to fire
escape staircase shall be separated and removed
from internal staircase.
(43)
Travel distance to emergency staircases
(1) Every building meant
for human occupancy shall be provided with emergency
exit sufficient to permit safe escape of occupants
in case of fire or wherever other emergency occurs.
(2) Emergency exits shall
be located in such a way that the travel distance
on each floor shall not b exceed 30 metres for
every occupant.
(44)
Floor protection requirements
All
requirements in respect of fire protection shall
be as in Part IV, Fire Protections in national
Building Code of India, 1983, and amendment No.
3 under fire protection Annexure II
(45)
Exit width
(1) The unit of exit
width used to measure the capacity of any exit
shall be 50 cms, a cleat width of 25 cms shall
be counted as an additional half unit and cleat
width less than 25 cms shall not be counted for
exit width.
(2) Occupants per unit
exit width shall be as in table 6
Table
6
Occupants
power unit exit width
| Sl. No.
|
Group
occupancy |
No. of
Occupants per unit exit width of Stairway
|
Doors
|
|
(1)
|
(2)
|
(3)
|
(4)
|
|
1
|
Group
A1 Residential |
25
|
75
|
|
2
|
Group
A2 special Residential
|
50
|
75
|
|
3
|
Group
B Educational |
25
|
75
|
|
4
|
Group
C Medical/Hospital |
25
|
75
|
|
5
|
Group
D Assembly |
60
|
90
|
|
6
|
Group
E |
50
|
75
|
|
7
|
Group
F Mercantile (Commercial)
|
50
|
75
|
|
8
|
Group
G1 Industrial |
50
|
75
|
|
9
|
Group
G2 Small Industrial
|
50
|
75
|
|
10
|
Group
H Storage (including Warehousing)
|
50
|
75
|
|
11
|
Group
I Hazardous |
25
|
40
|
(3) For determining the
exit required, the number of persons in any floor
area or the occupant load shall be based on the
actual number of occupants but in no case less
than that specified in Table 7
Table
7
Occupant
Load
| Sl.
No. |
Group
of Occupy |
Occupant
Load (gross area in square metres per person)
|
|
(1)
|
(2)
|
(3)
|
|
1.
|
Group
A1 Residential |
12.5
|
|
2.
|
Group
A2 special Residential
|
4.0
|
|
3.
|
Group
B Educational |
4.0
|
|
4.
|
Group
C Medical/Hospital |
15.0
|
|
5.
|
Group
D Assembly |
0.6
|
|
6.
|
Group
E Office |
1.5
|
|
7.
|
Group
F Mercantile (Commercial)
|
3
to 6 |
|
8.
|
Group
G1 Industrial |
10.0
|
|
9.
|
Group
G2 Small Industrial
|
10.0
|
|
10.
|
Group
H Storage (including Warehousing)
|
30.0
|
|
11.
|
Group
I Hazardous |
10.0
|
(4) Exits shall be wither
horizontal or vertical type.
(5) An exit may be a
doorway corridor or passageway to an internal
staircase or external staircases, ramps to street
or to the roof of a building; it may be a horizontal
exit leading to an adjoining building at the same
level;
Provided
that lifts and escalators shall not be considered
as exits.
(46)
Doorways
- Every exit
doorway shall open into an enclosed stairway
or a horizontal exit or a corridor or passageway
providing continuous and protected means of
egress.
- No exit
doorway shall be less than 75 cms in the case
of residential and 1.2 metres in the case of
all other occupancies.
(47)
Spiral stair fire escape
- The use
of spiral staircase shall be limited to low
occupant load and buildings upto 9 metres in
height unless they are connected to platform
such as balconies and terraces to allow easy
exit.
- A
spiral staircase shall be not less than 150cm
in diametre and shall be designed to give adequate
headroom.
(48)
Lift
- Every building
exceeding 4 story including basement or sunken
floors shall be provided with one lift in addition
to the staircases required as per these rules.
- The planning,
design and installation of lifts shall be in
accordance with Part VIII, building services,
Section 5, Lift, Elevators and Escalators in
National Building Code of India, 1983.
- Whenever
more than one lift is required, as per these
rules or byelaws made under the Act, at least
one lift shall be a higher capacity lift of
13 persons
(49)
Lighting and ventilation
- Every habitable
room shall be furnished with sufficient number
of openings such as windows and ventilators
affording effectual means of admission of light
and air by direct communication with the external
air.
- No portion
of a room shall be assumed to be lighted if
it is more than 7.5 metres away from the opening
assumed for lighting that portion.
- Windows
and ventilators, which open into a verandah
shall be deemed to communicate with the external
air, if such verandah is not more than 3 metres
wide and open throughout its entire length into
an open space open to the sky.
- Every kitchen
shall be ventilated according to the standards
stipulated for habitable rooms and shall have
suitable flue for the escape of smoke and heated
air unless it is provided with an approved form
of smokeless installation.
- every bathroom
or latrine shall be provided with natural light
and permanent ventilators by sufficient openings,
the aggregate area of which shall be not less
than one tenth of the floor area of the bathroom
or latrine.
- Every bathroom or latrine shall have at lest one of its
walls abutting on an open space or open verandah
or an shaft if not centrally air conditioned,
the size of air shaft shall not be less than
that specified in Table 8
Table
8
Size
of Air Shaft
| Sl.
No. |
No.
of Storeys |
Area
of the airshaft in Square metre
|
Minimum
width of airshaft in metre
|
|
1
|
Upto
3 |
1.08
|
0.9
|
|
2
|
Upto
6 |
2.4
|
1.2
|
|
3
|
Upto
10 |
3.0
|
1.5
|
|
4
|
Upto
10 |
5.0
|
2.0
|
(50)
Recreational space
Any
residential apartment building having ten or more
dwelling units or apartment units shall have ten
per cent of the total area of all apartment units
together, that is total built up area excluding
common service areas outside the apartment units,
as a single recreational space, with or without
side walls, within the building or as a single
open yard outside the building in which case it
shall be exclusive of parking areas, drive ways
or other utility areas.
(51)
Provisions in this Chapter not to apply to certain
buildings
Provisions
in this Chapter shall not apply to family residential
buildings upto three floors and stair cabin constructed
in plots upto 242.50 sq. metres (6 cents) of area.
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