Article 125Supplement v1, p. 125

COMMERCIAL LAWS SUPPLEMENT

SECTION 1210. Penthouses and Roof Structures . — (a)

Height — No penthouse or other projection above the

roof in structures of other than Type V construction shall

exceed 8.40 meters above the roof when used as an

enclosure for tanks or for elevators which run to the roof

and in all other cases shall not extend more than 3.60

meters in height with the roof.

(b) Area — The aggregate area of all penthouses and

other roof structures shall not exceed one third of the

area of the supporting roof.

(c) Prohibited Uses — No penthouse, bulkhead, or any

other similar projection above the roof shall be used for

purposes other than shelter of mechanical equipment or

shelter of vertical shaft openings in the roof. A penthouse

or bulkhead used for purposes other than that allowed by

this Section shall conform to the requirements of this

Code for an additional storey.

(d) Construction — Roof structures shall be constructed

with walls, floors, and roof as required for the main

portion of the building except in the following cases:

(1) On Types III and IV constructions, the exterior walls and

roofs of penthouses which are 1.50 meters or more from

an

adjacent

property

line

may

be

of

one-hour

fire-resistive non combustible construction.

(2) Walls not less than 1.50 meters from an exterior wall of

a type iv construction may be of one-hour fire-resistive

non combustible construction.

The above restriction shall not prohibit the placing of

wood flagpoles or similar structures on the roof of any

building.

(e) Towers and Spires — Towers and spires when enclosed

shall have exterior walls as required for the building to

which they attached. Towers not enclosed and which

extend more than 20.00 meters above the grade shall

have

their

framework

constructed

of

iron,

steel,

or

reinforced concrete. No tower or spire shall occupy more

than one-fourth of the street frontage of any building to

which it is attached and in no case shall the base area

exceed 150 square meters unless it conforms entirely to

the type of construction requirements of the building to

which it is attached and is limited in height as main part

of the building. If the area of the tower and spire exceeds

10.00 square meters any horizontal cross section, its

supporting frames shall extend directly to the ground.

The roof covering of the spires shall be as required for the

main room of the rest of the structure. Skeleton towers

used as radio masts, neon signs, or advertisement frames

and

placed

on

the

roof

of

any

building

shall

be

constructed entirely of incombustible materials when

more than 7.50 meters in height, and shall be directly

supported

on

an

incombustible

framework

to

the

ground. No such skeleton towers shall be supported on

roofs of combustible framings. They shall be designed to

withstand a wind load from any direction in addition to

any other loads.

SECTION 1211. Chimneys, Fireplaces, and Barbecues . — (a)

Chimneys — (1) Structural Design. — Chimneys shall be

designed, anchored, supported, reinforced, constructed,

and installed in accordance with generally accepted

principles of engineering. Every chimney shall be capable

of producing a draft at the appliance not less than that

required

for

the

safe

operation

of

the

appliance

connected

thereto.

No

Chimney

shall

support

any

structural load other than its own weight unless it is

designed to act as a supporting member. Chimneys in a

wood-framed building shall be anchored laterally at the

ceiling line and at each floor line which is more than 1.80

meters above grade, except when entirely within the

framework or when designed to be free standing.

(2) Walls — Every masonry chimney shall have walls of

masonry units, bricks, stones, listed masonry chimney

units, reinforced concrete or equivalent solid thickness of

hollow

masonry

and

lined

with

suitable

liners

in

accordance with the following requirements:

(2.1) Masonry Chimneys for Residential Type Appliances —

Masonry chimneys shall be constructed of masonry units

or reinforced concrete with walls not less than 100

millimeters thick; or of rubble stone masonry not less

than 300 millimeters thick. The chimney liner shall be in

accordance with this Code.

(2.2) Masonry Chimneys for Low Heat Appliances —

Masonry chimneys shall be constructed of masonry units

or reinforced concrete with walls not less than 200

millimeters thick: Except, that rubble stone masonry shall

be not less than 300 millimeters thick. The chimney liner

shall be in accordance with this Code.

(2.3) Masonry Chimneys for Medium-Heat Appliances —

Masonry chimneys for medium-heat appliances shall be

constructed of solid masonry units of reinforced concrete

not less than 200 millimeters thick, Except, that stone

masonry shall be not less than 300 millimeters thick and,

in

addition

shall

be

lined

with

not

less

than

100

millimeters of firebrick laid in a solid bed of fire clay

mortar with solidly filled head, bed, and wall joints,

starting not less than 600 millimeters below the chimney

connector entrance. Chimneys extending 7.50 meters or

less above the chimney connector shall be lined to the

top.

(2.4)

Masonry

Chimneys

for

High-Heat Appliances —

Masonry chimneys for high-heat appliances shall be

constructed with double walls of solid masonry units or

reinforced concrete not less than 200 millimeters in

thickness,

with

an

air

space

of

not

less

than

50

millimeters between walls. The inside of the interior walls

shall be of fire-brick not less than 100 millimeters in

thickness laid in a solid bed of fire clay mortar with solidly

filled head, bed, and wall joints.

(2.5)

Masonry Chimneys for Incinerators Installed in

Multi-Storey Buildings (Apartment-Type Incinerators) —

Chimneys

for

incinerators

installed

in

multi-storey

building using the chimney passageway as a refuse chute

where the horizontal grate area of combustion chamber

does not exceed 0.80 square meter shall have walls of

solid masonry or reinforced concrete, not less than 100

millimeters thick with a chimney lining as specified in

this Code. If the grate area of such an incinerator exceeds

0.80 square meter, the walls shall not be less than 100

millimeters of firebrick except that higher than 9.00

meters above the roof of the combustion chamber,

common brick alone 200 millimeters in thickness, may be

used.

(2.6) Masonry Chimneys for Commercial and Industrial

Type Incinerators — Masonry chimneys for commercial

and industrial type incinerators of a size designed for not

more than 110 kilograms of refuse per hour and having a

horizontal grate area not exceeding 0.50 square meter

shall have walls of solid masonry or reinforced concrete

not less than 100 millimeters thick with lining of not less

than 100 millimeters of firebrick, which lining shall extend

for not less than 12.00 meters above the roof of the

combustion chamber. If the design capacity of grate area

of such an incinerator exceeds 110 kilograms per hour and

0.80 square meter respectively, walls shall not be less

than 200 millimeters thick, lined with not less than 100

millimeters of firebrick extending the full height of the

chimney.

(3) Linings — Fire clay chimney lining shall not be less

than 15 millimeters thick. The lining shall extend from 200

millimeters below the lowest inlet, or, in the case of

fireplace, from the throat of the fireplace to a point above

enclosing masonry walls. Fire clay chimney linings shall

be installed ahead of the construction of the chimney as

it is carried up, carefully bedded one on the other in fire

clay mortar, with close-fitting joints left smooth on the

inside. Firebrick not less than 500 millimeters thick may

be used in place of fire clay chimney.

(4) Area — No chimney passageway shall be smaller in

area than the vent connection of the appliance attached

thereto.

© Compiled by RGL

125 of 203