1964_BUILDING_(CONSTRUCTION)_REGULATIONS — Page 117

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1985 Ed.]

Building (Construction) Regulations

[CAP. 123

B 117

[Subsidiary]

Use

6 Transformer chamber or purpose involving a similar fire risk.

7 Garage purposes.

2 Volume, or floor area in any storey (as the case may be)

Fire resistance period

In all cases. 2 hours.

(a) Not more than 45 m2 in floor area. 1 hour.

(b) More than 45 m2 but not more than 90 m2 in floor area. 1 hour.

(c) More than 90 m2 in floor area. 2 hours.

(2) Save with the consent of the Building Authority the floor area of any compartment used for bulk storage or warehouse purposes shall not exceed 700 m2.

(3) Where a single storey building does not exceed 7 000 m3 in volume or 7.5 m in height, steel work therein other than columns and beams in external or party walls may, subject to the provisions of PART XI (Structural Use of Steel) be unprotected.

(4) The joints of and any elements of construction shall be tight and proof against the passage of smoke or flame.

185. Every compartment of a building shall be separated from any adjoining compartment by a wall or floor having an F.R.P. of not less than 2 hours, and if 1 or both compartments demand a longer period of fire resistance, the separating wall or floor between the compartments shall have an F.R.P. of 4 hours:

Provided that where adjoining compartments are used solely for domestic purposes the separating wall or floor between the compartments shall have an F.R.P. of 1 hour.

186. (1) Each element of construction of a staircase shall have an F.R.P. not less than the period required for each element of construction of the building or compartment in which the staircase is situated:

Provided that this paragraph shall not apply to staircases enclosed in accordance with paragraph (2).

(2) Where a staircase serves more than 1 compartment of a building-

(a) such staircase shall be enclosed by walls, and

(b) such walls shall have an F.R.P. not less than the longer period required for the elements of construction in any compartment so served:

Provided that this paragraph shall not apply to any external staircases open to the weather on at least 2 sides.

L.N. 294/76.

Adjoining compartments to be separated.

Staircases.

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2026-05-04 08:24:03 · NVIDIA / meta/llama-4-maverick-17b-128e-instruct
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B 117[Subsidiary]Use6 Transformer chamber or purpose involving a similar fire risk.7 Garage purposes.2 Volume, or floor area in any storey (as the case may be)Fire resistance periodIn all cases. 2 hours.(a) Not more than 45 m2 in floor area. 1 hour.(b) More than 45 m2 but not more than 90 m2 in floor area. 1 hour.(c) More than 90 m2 in floor area. 2 hours.(2) Save with the consent of the Building Authority the floor area of any compartment used for bulk storage or warehouse purposes shall not exceed 700 m2.(3) Where a single storey building does not exceed 7 000 m3 in volume or 7.5 m in height, steel work therein other than columns and beams in external or party walls may, subject to the provisions of PART XI (Structural Use of Steel) be unprotected.(4) The joints of and any elements of construction shall be tight and proof against the passage of smoke or flame.185. Every compartment of a building shall be separated from any adjoining compartment by a wall or floor having an F.R.P. of not less than 2 hours, and if 1 or both compartments demand a longer period of fire resistance, the separating wall or floor between the compartments shall have an F.R.P. of 4 hours:Provided that where adjoining compartments are used solely for domestic purposes the separating wall or floor between the compartments shall have an F.R.P. of 1 hour.Provided that this paragraph shall not apply to staircases enclosed in accordance with paragraph (2).(2) Where a staircase serves more than 1 compartment of a building-(a) such staircase shall be enclosed by walls, and(b) such walls shall have an F.R.P. not less than the longer period required for the elements of construction in any compartment so served:Provided that this paragraph shall not apply to any external staircases open to the weather on at least 2 sides.L.N. 294/76.Adjoining compartments to be separated.
Baseline (Original)
B 117[Subsidiary]Use6 Transformer chamber or purpose involving a similar fire risk.7 Garage purposes.2 Volume, or floor area in anyI storey (as the case may be)Fire resistance periodIn all cases. 2 hours.(a) Not more than 45 m2 in floor area. 1 hour.(b) More than 45 m2 but not more than 90 m2 in floor area. I hour.(c) More than 90 m2 in floor area. 2 hours.(2) Save with the consent of the Building Authority the floor area of any1 compartment used for bulk storage or warehouse purposes shall not exceed 700 m2.(3) Where a single storey building does not exceed 7 000 m3 in volume or 7.5 m in height, steel work therein other than columns and beams in external or party walls/may, subject to the provisions of PART XI (Structural Use of Steel) be unprotected.(4) The joints of and any elements of construction shall be tight and proof against the passage of smoke or flame.185. Every compartment of a building shall be separated from any adjoining compartment by a wall or floor having an F.R.P. of not less than 2 hours, and if 1 or both compartments demand a longer period of fire resistance, the separating wall or floor between the compartments shall have an F.R.P. of 4 hours:Provided that where adjoining compartments are used solely for domestic purposes the separating wall or floor between the compartments shall have an F.R.P. of 1 hour.Provided that this paragraph shall not apply to staircases enclosed in accordance with paragraph (2).(2) Where a staircase serves more than 1 compartment of a building-(a) such staircase shall be enclosed by walls, and(6) such walls shall have an F.R.P. not less than the longer period required for the elements of construction in any compartment so served:Provided that this paragraph shall not apply to any external staircases open to the weather on at least 2 sides.L.N. 294/76.Adjoining compartments to be separated.
2026-05-04 08:24:03 · Baseline
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1985 Ed.]

Building (Construction) Regulations

[CAP. 123

B 117

[Subsidiary]

Use

6 Transformer

chamber or purpose involving a

similar fire risk.

7 Garage

purposes.

2

Volume, or floor area in any I storey (as the case may be)

Fire resistance

period

In all cases.

2 hours.

(a) Not more than 45 m2 in floor area.

1 hour.

(b)

More than 45 m2 but not more than 90 m2 in floor area.

I hour.

(c) More than 90 m2 in floor area.

2 hours.

(2) Save with the consent of the Building Authority the floor area of any 1 compartment used for bulk storage or warehouse purposes shall not exceed 700 m2.

(3) Where a single storey building does not exceed 7 000 m3 in volume or 7.5 m in height, steel work therein other than columns and beams in external or party walls/may, subject to the provisions of PART XI (Structural Use of Steel) be unprotected.

(4) The joints of and any elements of construction shall be tight and proof against the passage of smoke or flame.

185. Every compartment of a building shall be separated from any adjoining compartment by a wall or floor having an F.R.P. of not less than 2 hours, and if 1 or both compartments demand a longer period of fire resistance, the separating wall or floor between the compartments shall have an F.R.P. of 4 hours:

Provided that where adjoining compartments are used solely for domestic purposes the separating wall or floor between the compartments shall have an F.R.P. of 1 hour.

186. (1) Each element of construction of a staircase shall have an F.R.P. not less than the period required for each element of construction of the building or compartment in which the staircase is situated:

Provided that this paragraph shall not apply to staircases enclosed in accordance with paragraph (2).

(2) Where a staircase serves more than 1 compartment of a building-

(a) such staircase shall be enclosed by walls, and

(6) such walls shall have an F.R.P. not less than the longer period required for the elements of construction in any compartment so served:

Provided that this paragraph shall not apply to any external staircases open to the weather on at least 2 sides.

L.N. 294/76.

Adjoining compartments to be separated.

Staircases.

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