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TABLE 3.2A : SIZE LIMITATION OF BUILDING & COMPARTMENT
Compartments Maximum Floor Area Maximum Cubical Extent
(1) (2) (3)
Compartment below ground level
(No compartment shall comprise more than one storey)
2000m2 7500m³
Compartments between average ground level and a height of 24m
(No compartment shall comprise more than 3 storeys)
4000m2 15000m³
Compartments above a height of 24m from average ground level
(No compartment shall comprise more than one storey)
2000m2 7500m³

TABLE 3.3A : Minimum periods of fire resistance

Note :

In this Table -

“cubical extent” means the cubical extent of the building or, if the building is divided into compartments, the compartment of which the elements of structure forms part;

“floor area” means the floor area of each storey in the building or, if the building is divided into compartments, of each storey in the compartment of which the element of structure forms part;

“height” has the meaning assigned to that expression by Cl.3.3.1b.;

“NL” means No limit applicable.

“NR” means Not Relevant.

PART I : BUILDINGS OTHER THAN SINGLE STOREY BUILDINGS
Purpose GroupMaximum DimensionsMinimum period of fire resistance for elements of structure (*)/external wall/compartment wall forming part of:
(1)

Height** (m)

(2)

Floor Area (m²)

(3)

Cubical Extent (m³)

(4)

Above ground Storey (hrs)(5)

Basement Storey (hrs)

(6)

PG I - Small residential
House having not more than 3 storeysNLNLNL11
House having 4 storeysNR250NR11
NLNLNL12
House having more than 4 storeysNLNLNL12
PG II - Other residential
Building or part (+) having not more than 2 storeysNL500NR11
NLNLNL12
Building or part (+) 3 storeysNR250NR11
NLNLNL12
Building having more than 3 storeys283000850012
NLNLNL22
PG III - Institutional282000NL11
NLNLNL22
PG IV - Office15NL350011
2850001400012
NLNLNL22
PG V - Shop15NR350011
281000700012
NLNLNL24
PG VI - Factory15NR425011
28NR850012
NLNLNL24
PG VII - Place of public resort15NR350011
281000700012
NLNLNL22
PG VIII - Storage and general15NR170011
15NR350012
28NR700024(b)
NLNLNL4(a)4(b)

Notes to Part I


For the purpose of Cl 3.3.2 the period of fire resistance to be taken as being relevant to an element of structure is the period included in columns (3) or (4) in the line of entries which specifies the floor area with which there is conformity or, if there are two or more such lines, in the topmost of those lines.
(*) = A floor which is immediately over a basement storey shall be deemed to be an element of structure forming part of a basement storey.
(**) = Height for elements of structure referred to building height including basement. In the case of compartment wall/external wall, the height shall be based on the height of the wall between compartment floors.
(+) = The expression “part” means a part which is separated as described in Cl.3.3.1b..
(a) = This period is reduced to 2-hrs for:

(1) non-sprinkler-protected, open-sided standalone car park buildings
(2) sprinkler-protected, above-ground car park floors in standalone car park building or sprinkler- protected mixed-use building.

(b) = Single basement car park storey, which is sprinkler-protected, the element of structure can be reduced to half the minimum period of fire resistance.

PART 2 - SINGLE STOREY BUILDINGS

Purpose Group

(1)

Maximum Floor Area

(m2)

(2)

Minimum period of fire resistance for elements of structure, external wall/compartment wall

(hrs)

(3)

PG I - Small residential

NL

1

PG II - Other residential

NL

1

PG III - Institutional

NL

1

PG IV - Office

NL

1

PG V - Shop

3000

1

NL

2

PG VI - Factory

3000

1

NL

2

PG VII - Place of public resort

3000

1

NL

2

PG VIII - Storage and general

1000

1

3000

2

NL

4(a)

 

Notes to Part 2:

For the purpose of Cl 3.3.2 the period of fire resistance to be taken as being relevant to an element of structure is the period included in column (3) in the line of entries which specifies the floor area with which there is conformity or, if there are two or more such lines, in the topmost of those lines.

(a) = This period is reduced to 2-hrs for open-sided buildings which are used solely for car parking.

TABLE 3.3B : REQUIREMENTS FOR SUSPENDED CEILING

Height of Building

(1)

Type of Floor

(2)

Required Fire Resistance of Floor

(3)

Description of Suspended Ceiling

(4)

Less than 15m

Non-compartment

1-hr or less

Surface of ceiling exposed within the cavity not lower than Class I surface flame spread rating.

Compartment

Less than 1-hr

Compartment

1-hr

Surface of ceiling exposed within the cavity not lower than Class 0 surface flame spread rating; supports and fixing for the ceiling non-combustible.

Any

More than 1-hr

Ceiling of non-combustible con- struction and jointless; supports and fixings for the ceiling non- combustible.

15m or more

Any

1-hr or less

Surface of ceiling exposed within the cavity not lower than Class 0 surface flame spread rating and jointless; supports and fixing for the ceiling non-combustible.

Any

More than 1-hr

Ceiling of non-combustible con- struction and jointless; supports and fixings for the ceiling non- combustible

Note :

References to classes in the above table are to classes as specified in Cl.3.13.

Where the space above a suspended ceiling is protected by an automatic sprinkler system it shall be exempted from the requirements for non-combustibility and surface spread of flame classification as specified in the above table provided the ceiling is not situated over an exit passageway, protected lobby or other required protected means of escape.

TABLE 3.4A : SPECIFIC PROVISIONS OF TEST FOR FIRE RESISTANCE OF ELEMENTS OF STRUCTURE ETC.
Part of Building Minimum Provisions when Tested to BS 476: Part 20-23 (mins) Method of Exposure
Stability Integrity Insulation
1. Structural frame, beam or column*No requirementNo requirementexposed faces
2. Load-bearing wall,Load-bearing wall which is not also an external wall, separating wall, compartment wall or protecting structure (See 4, 5, 6 or 7)*No requirementNo requirementeach side separately
3. Floors
(a) floor in upper storey of a 2-storey dwelling house (but not over a garage)
301515from underside (Note 1)
(b) any other floor (including a compartment floor)***from underside (Note 1)
4. External walls
(a) any part less than 1m from point on relevant boundary***each side separately
(b) any part of the wall of a building used for Assembly purposes which is 1m or more from the relevant boundary and is described in Note 2**15from inside
* (max. 60)* (max. 60)* (max. 60)from outside
(c) any part 1m or more from the relevant boundary and is not a part de- scribed in (b) above**15from inside
5. Separating wall

*

(min. 60)

*

(min. 60)

*

(min. 60)

each side separately
6. Compartment wall***each side separately
7. Protecting structure (any part)***each side separately
8. Wall separating an attached or integral garage from a dwelling house***from garage side
9. Doors
a. in a separating wallNo provision

+

(min. 60)

No provision***each side separately when fitted in its frame
b. in a compartment wall, if it separates a flat or maisonette from a space in common useNo provision30No provision***each side separately
c. in a compartment wall or compartment floor not described in (b) aboveNo provision+No provision***each side separately
d. in a protecting structure situated wholly or partly above the level of the adjoining ground in a building used for flats, other residential, assembly or office purposesNo provision30No provision***each side separately
e. in a protecting structure not described in (d) aboveNo provision

**

(min. 30)

No provision***each side separately
f. any other door (including a door in a cavity barrier and a door between a dwelling house and garage)No provision30No provision***each side separately when fitted in its frame
10. Casing around a drainage system303030++from outside
11. Cavity barriers
a. cavity barrier 1m x 1m or larger303015each side separately
b. any other cavity barrier3030No provisioneach side separately
c. ceiling303030from underside

Modifications

++ = No provision for insulation if the casing is more than 50mm from any pipe in the enclosure (except a pipe passing through the casing)

Notes

* = Period of fire resistance as specified

+ = Period of fire resistance for the wall or floor in which the door is situated
** = Half the period of fire resistance for the wall or floor in which the door is situated
*** = This exemption does not apply to fire-rated glass door. A suspended ceiling should only be relied on to contribute to the fire resistance of the floor if the ceiling meets the appropriate provisions given in Table 3.3B.

Any part of the wall which is 7.5m or less above the ground, or above a roof or any other part of the building to which people have access, if the building has 2 or more storeys.

TABLE 3.9A : MAXIMUM NOMINAL DIAMETER OF PIPES

 

 

Situation

Pipe material and maximum nominal diameter (mm)

Non-combustible

material (1)

Lead, aluminium or aluminium alloy, or UPVC (2)

Any other material

When the pipes (include pipe supports) penetrate the structure enclosing a protected shaft which is not an exit stairway or lift shaft

150

100

 

40

Any other situation

150

100 (stack pipe) (3),(4),(5)

75 (branch pipe) (3),(4),(5)

40

Note:

(1) =  A non-combustible material (such as for cast iron or steel pipes and the pipe supports with melting point of at least 1200°C) which if exposed to a temperature of 750°C will not soften nor fracture to the extent that flame or gases will pass through the wall of the pipe.

(2) = UPVC pipes complying with BS 4514 or EN 1329-1.

(3) = Within toilets, wash rooms or external corridors, maximum diameter of UPVC pipes can be increased to double the size given in the above table.

(4) = Within areas of fire risk, such as kitchens, and adjacent to escape routes, UPVC pipes shall be enclosed by construction having fire resistance rating of at least ½ hr.

(5) = Where the size of UPVC pipes exceeds that specified under this clause, approved fire collar shall be fitted at all positions where such pipes pass through constructions required to act as a barrier to fire spread.

TABLE 3.11A : MAXIMUM DIMENSIONS OF CAVITIES

Location of cavity

Purpose Group of building or compartment

*Class of surface exposed in cavity

Max. dimension in any direction

Between roof and ceiling

I & II

any

no limit

others

any

20m

Any other cavity

any

Class 0

20m+

any

any

8m+

Note:

* = excluding surface of any pipe, cable, conduit or insulation of any pipe

+ = shall not apply to raised floor under Cl.3.11.8

TABLE 3.13A : MINIMUM FLAME-SPREAD CLASSIFICATION OF FINISHES TO WALL, COLUMN, BEAM AND CEILING

Building Type

Non-sprinkler-protected Building

Sprinkler-protected Building

Room, compartment

 

Circulation space

Smoke- stop /fire lift lobby

Exit stair- case & exit passageway

Room, compartment

 

Circulation space

Smoke- stop /fire lift lobby

Exit stair- case & exit passageway

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

BS(2)

EN(2)

PG I - Small residential

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

2

C

0

B

PG II - Other residential

NA

NA

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

PG III - Institutional

1

C

0

B

0

B

NC

A2

3

D(1)

3

D(1)

2

C

0

B

PG IV - Office

1

C

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

PG V - Shop

1

C

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

PG VI - Factory

1

C

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

PG VII - Place of public resort

1

C

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

PG VIII - Storage

1

C

0

B

0

B

NC

A2

NA

NA

NA

NA

2

C

0

B

Note:

NC = Non-combustible to comply with BS 476 Pt 4

NA = Not Applicable

(1) = Applies to detention facilities and healthcare, including hospital, old-aged homes, nursing homes for mentally or physically disabled patients

(2) = BS/EN refers to the following test standards. Meeting an EN standard implies that the corresponding BS standard is complied with but not vice-versa.

 

EN 13501-1

BS 476

Classification

Test Standards

Classification

Test Standards

Class A1

EN ISO 1182 + EN ISO 1716

Non-combustibility (NC)

BS 476 Part 4

Class A2

[EN ISO 1182 or EN ISO 1716] + EN 13823

Limited combustibility (LC)

BS 476 Part 11

Class B

EN 13823 + EN ISO 11925-2

Class 0

BS 476 Part 6 & 7

Class C

EN 13823 + EN ISO 11925-2

Class 1

BS 476 Part 7

Class C

EN 13823 + EN ISO 11925-2

Class 2

BS 476 Part 7

Class D

EN 13823 + EN ISO 11925-2

Class 3

BS 476 Part 7

Class F

EN ISO 11925-2

Class 4

BS 476 Part 7

TABLE 3.13B : MINIMUM FLAME-SPREAD CLASSIFICATION OF MATERIAL CONSTRUCTION (HOMOGENOUS)*

Building Type

Non-sprinkler-protected Building

Sprinkler-protected Building

Internal Non-load-bearing Wall and Ceiling

Roof(5) Covering, including Supports

Internal Non-load-bearing Wall and Ceiling

 

Roof(5) Covering, including Supports

Within Room, Compartment

Within Circulation Spaces(6)

Within Room, Compartment

Within Circulation Spaces(6)

BS(7)

EN(7)

BS(7)

EN(7)

BS(7)

EN(7)

BS(7)

EN(7)

BS(7)

EN(7)

BS(7)

EN(7)

PG I - Small residential

NA

NA

NA

NA

NA(2)

NA(2)

NA

NA

NA

NA

NA

NA

PG II - Other residential

NA

NA

LC(3)

A2

NA(2)

NA(2)

NA

NA

1

C

NA

NA

PG III - Institutional

0

B

LC(3)

A2

1

C(4)

1

C(1)

0

B(1)

2

C(1)(4)

PG IV - Office

0

B

LC(3)

A2

1

C(4)

2

C

1

C

2

C(4)

PG V - Shop

0

B

LC(3)

A2

1

C(4)

2

C

1

C

2

C(4)

PG VI - Factory

0

B

LC(3)

A2

1

C(4)

2

C

1

C

2

C(4)

PG VII - Place of public resort

0

B

LC(3)

A2

1

C(4)

2

C

1

C

2

C(4)

PG VIII - Storage

0

B

LC(3)

A2

1

C(4)

2

C

1

C

2

C(4)

Note:

(1)  =  Applies to detention facilities and healthcare, including hospital, nursing homes for handicapped, disabled, aged or persons with mental and/or

mobility impairment.

(2) = Roof support can be of timber construction. Any use of plastic material for roof shall comply with the requirements in Cl.3.15.19c.(8)

(3) = Limited combustibility tested under BS 476 Part 11 or  non-combustibility tested under BS 476 Part 4

(4) =  Composite panel complying with ASTM E108 Class A is also acceptable

(5) = Applicable to composite panel roofing only. Refer to Cl.3.14.1 for other roofing materials

(6) = Including common corridor, passageway etc.

(7) = BS/EN refers to the test standards shown in the Note to Table 3.13A. Meeting an EN standard implies that the corresponding BS standard is com- plied with but not vice-versa.

NA = Not Applicable

LC = Limited combustibility

* = When composite panels are used for the construction, the minimum flame-spread classification shall be applicable to the core material of the panels

FIRE TESTS AND ACCEPTANCE CRITERIA FOR CONSTRUCTION MATERIALS CONTAINING PLASTIC

TABLE 3.15A : PLASTIC FLOOR MATERIAL/FINISHES

Test Category

Fire Risk

Applicable Fire Test Standards

Acceptance Criteria

A

Toxicity

emission

BS EN 45545-2

CIT < 0.75

EN ISO 5659-2

CIT < 0.75

B

Smoke

density

EN 13501-1

Smoke classification : s1 rating.

EN 14041

EN ISO 9239-1

ASTM E662

Smoke density, Ds,max < 450

NFPA 258

EN ISO 5659-2

Smoke density, Ds,max < 150

C

Flame spread

EN 13501-1

1. Sprinkler-protected premises

(a) Sleeping occupancy : Class Cfl or better

(b) Non-sleeping occupancy : Class Dfl or better

 

2. Non-sprinkler-protected premises

(a) Sleeping occupancy : Class Bfl or better

(b) Non-sleeping occupancy : Class Cfl or better

EN 14041

EN ISO 9239-1

ASTM E648

Critical Radiant Flux (CRF) > 0.45 W/cm2

NFPA 253

 

FIRE TESTS AND ACCEPTANCE CRITERIA FOR CONSTRUCTION MATERIALS CONTAINING PLASTIC

TABLE 3.15B : PLASTIC WALL/CEILING MATERIAL/FINISHES

Test Category

Fire Risk

Applicable Fire Test Standards

Acceptance Criteria

D

Toxicity emission

BS EN 45545-2

CIT < 0.75

EN ISO 5659-2

CIT < 0.75

E

Smoke density

EN 13501-1

1. Smoke classification to be of s1 rating

 

2. Flaming droplet classification to be d0 rating

EN ISO 5659-2

VOF4  < 300 min

F

Flame spread

EN 13501-1

1. Internal wall finishes : to comply with Cl 3.13

 

2. External wall finishes : to comply with Cl 3.5

BS 476

NFPA 285

To pass criteria in NFPA 285

Note:

Test categories D and E are not required for external wall finishes

TABLE 3.15C : PLASTIC ROOF COVERING MATERIAL

Test Category

Fire Risk

Applicable Fire Test Standards

Acceptance Criteria

G

Toxicity

emission

Not critical. Generally exposed to external.

H

Smoke

density

EN 13501-1

1. Generally not critical if exposed to external.

2. If exposed as ceiling on the underside, then must meet requirements for ceiling (achieve s1-d0 rating).

J

Flame spread

EN 13501-5

Class BROOF

BS 476-3

Class AA/AB/AC

BS 476-6/7

Class 1

ASTM E108

Class A

CONDITIONS FOR THE USE OF PLASTIC FLOOR FINISHES (UNCOVERED)

Diagram 3.15.19c.(1)

Diagram 3.15.19c.(1) : Plastic floor finishes overlaid on structural floor

TABLE 3.15D : UNCOVERED PLASTIC FLOOR FINISHES

S/N

Material Construction

Assessment

Remarks

1

Non-combustible material

Allowed

No further fire test is required.

2

Material thickness not exceeding 10mm

Allowed

1. No further fire test is required.

2. For sprinkler-protected premises, material not exceeding 20mm can be exempted from the tests in Table 3.15A.

3

Use in open-to-sky conditions

Allowed

No further fire test is required.

4

Use in exit staircase/exit passageways

Not allowed

Key escape routes shall be protected.

5

Material thickness exceeding 10mm

Allowed with conditions

Allowed if pass test categories A, B and C in Table 3.15A

CONDITIONS FOR THE USE OF PLASTIC MATERIAL CAST INTO (EMBEDDED WITHIN) STRUCTURAL FLOOR SYSTEM

Diagram 3.15.19c.(2)

Diagram 3.15.19c.(2) : Plastic material embedded within masonry floor

TABLE 3.15E : PLASTICS EMBEDDED WITHIN MASONRY FLOOR

S/N

Material construction

Assessment

Remarks

1

Non-combustible material

Allowed

No further fire test is required.

2

Material thickness not exceeding 10mm

Allowed

1. No further fire test is required.

2. For sprinkler-protected premises, material not exceeding 20mm can be exempted from the tests in Table 3.15A.

3

Use in open-to-sky conditions

Allowed

No further fire test is required.

4

Use in exit staircase/exit passageways

Not allowed

Key escape routes shall be protected.

5

Material thickness exceeding 10mm

Allowed with conditions

1. If masonry cover is less than 25mm thick, the material shall pass test categories A, B and C in Table 3.15A.

2. If masonry cover is at least 25mm thick all around the embedded plastic, tests in Table 3.15A are exempted.

3. The locations where embedded plastics are installed shall be clearly indicated on the plans.

CONDITIONS FOR THE USE OF PLASTIC FLOOR FINISHES (COVERED)

Diagram 3.15.19c.(3)

Diagram 3.15.19c.(3) : Plastic floor finishes laid on structural floor, and covered by a non-combustible overlay

TABLE 3.15F : COVERED PLASTIC FLOOR FINISHES

S/N

Material Construction

Assessment

Remarks

1

Non-combustible material.

Allowed

No further fire test is required.

2

Material thickness not exceeding 10mm

Allowed

1. No further fire test is required.

2. For sprinkler-protected premises, material not exceeding 20mm can be exempted from the tests in Table 3.15A.

3

Use in open-to-sky conditions.

Allowed

No further fire test is required.

4

Use in exit staircase / exit passageways

Not allowed

Key escape routes shall be protected.

5

Material thickness exceeding 10mm

Allowed with conditions

1. Allowed if pass test categories A, B and C in Table 3.15A.

2. If the overlay is non-combustible and at least 25mm thick, test category C in Table 3.15A is exempted

CONDITIONS FOR THE USE OF PLASTIC WALL FINISHES OR CEILING FINISHES

Diagram 3.15.19c.(4)

Diagram 3.15.19c.(4) : Plastic wall or ceiling material/finishes installed internally/externally

TABLE 3.15G : PLASTIC WALL OR CEILING MATERIAL/FINISHES

S/N

Material Construction

Assessment

Remarks

1

Non-combustible material

Allowed

No further fire test required.

2

Material thickness not exceeding 1mm

Allowed

No further fire test required.

3

Use in exit staircase/exit passageways

Not allowed

Key escape routes shall be protected.

4

Material thickness exceeding 1mm

Allowed with conditions

Allowed if pass test categories D, E and F in Table 3.15B, unless specifically exempted for external building applications.

CONDITIONS FOR THE USE OF COMPOSITE PANEL WITH PLASTIC USED AS WALL FINISHES OR CEILING FINISHES

Diagram 3.15.19c.(5)

Diagram 3.15.19c.(5) : Composite panel with plastic used as wall or ceiling material/finishes installed internally/externally

TABLE 3.15H : COMPOSITE PANEL WITH PLASTIC USED AS WALL OR CEILING MATERIAL/FINISHES

S/N

Material Construction

Assessment

Remarks

1

Non-combustible plastic material

Allowed

No further fire test required.

2

Plastic material thick- ness not exceeding 1mm

Allowed

No further fire test required.

3

Use in exit staircase/ exit passageways

Not allowed

Key escape routes shall be protected.

4

Plastic material thickness exceeding 1mm

Allowed with conditions

Allowed if pass test categories D, E and F in Table 3.15B, unless specifically exempted for external building applications.

 

CONDITIONS FOR THE USE OF PLASTIC MATERIAL EMBEDDED IN MASONRY WALL/CEILING

Diagram 3.15.19c.(6)

Diagram 3.15.19c.(6) : Plastic material embedded within wall/ceiling

TABLE 3.15I : PLASTIC MATERIAL EMBEDDED IN MASONRY WALL/CEILING

S/N

Material Construction

Assessment

Remarks

1

Non-combustible material

Allowed

No further fire test required.

2

Material thickness not exceeding 1mm

Allowed

No further fire test required.

3

Use in exit staircase/exit passageways

Not allowed

Key escape routes shall be protected.

4

Material thickness exceeding 1mm

Allowed with conditions

1. If masonry cover is less than 25mm thick, the material shall pass test categories D, E and F in Table 3.15B.

2. If masonry cover is at least 25mm thick all around the embedded plastic, tests in Table 3.15B are exempted.

3. The locations where embedded plastics are installed shall be clearly indicated on the plans.

CONDITIONS FOR THE USE OF PLASTIC ROOF COVERING

TABLE 3.15J : PLASTIC ROOF COVERING

S/N

Material Construction

Assessment

Remarks

1

Non-combustible material

Allowed

No further fire test required.

2

Material thickness not exceeding 1mm

Allowed

No further fire test required.

3

Use in exit staircase/ exit passageways

Not allowed

Key escape routes shall be protected.

4

Material thickness exceeding 1mm

Allowed with conditions

1. Allowed if  pass  test  category J in Table 3.15C, as well as test category H in Table 3.15C if exposed on underside.

2. Exempted from test categories H and if the requirements specified for skylights in Cl.3.13.5b..

CONDITIONS FOR THE USE OF COMPOSITE PANEL CONTAINING PLASTIC AS ROOF COVERING

 

TABLE 3.15K : COMPOSITE PANEL WITH PLASTIC USED AS ROOF COVERING

S/N

Material Construction

Assessment

Remarks

1

Non-combustible plastic material

Allowed

No further fire test required.

2

Plastic material thickness not exceeding 1mm

Allowed

No further fire test required.

3

Use in exit staircase/ exit passageways

Not allowed

Key escape routes shall be protected.

4

Plastic material thickness exceeding 1mm

Allowed with conditions

1. Allowed if pass  test  category  J in Table 3.15C, as well as test category H in Table 3.15C if exposed on underside.

2. Exempted from test categories H and J if the requirements specified for skylights in Cl.3.13.5b..