Annex 3A - Notional Periods Of Fire Resistance

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Annex 3A - Notional Periods Of Fire Resistance

CPFPRTS 2022

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A.1 GENERAL

A.1.1 In this Annex:

a. "Class 1 aggregate" means foamed slag, pumice, blast furnace slag, pelleted fly ash, crushed brick and burnt clay products (including expanded clay) well-burnt clinker and crushed limestone. "Class 2 aggregate" means flint gravel, granite, and all crushed natural stones other than limestones.

b. Any reference to plaster means:

(1) In the case of an external wall 1m or more from the relevant boundary, plaster applied on the internal face only;

(2) In the case of any other wall, plaster applied on both faces;

(3) If to plaster of a given thickness on the external face of a wall, except in the case of a reference to vermiculite-gypsum plaster, rendering on the external face of the same thickness; and

(4) If to vermiculite-gypsum plaster, vermiculite-gypsum plaster of a mix within the range of 1½ to 2:1 by volume.

c. In the case of a cavity wall, the load is assumed to be on inner leaf only except for fire resistance period of 4 hrs.

d. Any material or type of construction or method of mixing, preparing, using, applying or fixing the material as referred to in the table, shall conform with the relevant provisions of the Building Control Act (Chapter 29), and the relevant Singapore Standard or Singapore Standard Code of Practice. In the absence of the aforementioned Standard or Code of Practice, the relevant British equivalent or other accepted Standard or Code of Practice shall be applicable.

A.2 WALLS

A.2.1 Masonry construction:

Construction and materials	Minimum thickness excluding plaster (in mm) for period of fire resistance of
	Loadbearing			Non-loadbearing
	4-hrs	2-hrs	1-hrs	4-hrs	2-hrs	1-hrs
1. Reinforced concrete, minimum concrete cover to main reinforcement of 25 mm:
(a) Unplastered (to comply with SS EN 1992-1-2)	-	-	-	-	-	-
(b) 12.5mm cement-sand plaster	180	100	75	-	-	-
(c) 12.5mm gypsum-sand plaster	180	100	75	-	-	-
(d) 12.5mm vermiculite-gypsum plaster	125	75	63	-	-	-
2. No-fines concrete of Class 2 aggregate:
(a) 13mm cement-sand plaster	-	-	-	150	150	150
(b) 13mm gypsum-sand plaster	-	-	-	150	150	150
(c) 13mm vermiculite-gypsum plaster	-	-	-	150	150	150
3. Bricks of clay, concrete, or sand - lime:
(a) Unplastered	200	100	100	170	100	75
(b) 13mm cement-sand plaster	200	100	100	170	100	75
(c) 13mm gypsum-sand plaster	200	100	100	170	100	75
(d) 13mm vermiculite-gypsum or perlite-gypsum plaster	100	100	100	170	100	75
4. Concrete blocks of Class 1 aggregate:
(a) Unplastered	150	100	100	150	75	75
(b) 12.5mm cement-sand plaster	150	100	100	100	75	75
(c) 12.5mm gypsum-sand plaster	150	100	100	100	75	75
(d) 12.5mm vermiculite-gypsum plaster	100	100	100	75	75	50
5. Concrete blocks of Class 2 aggregate:
(a) Unplastered	-	100	100	150	100	75
(b) 12.5mm cement-sand plaster	-	100	100	150	100	75
(c) 12.5mm gypsum-sand plaster	-	100	100	150	100	75
(d) 12.5mm vermiculite-gypsum plaster	100	100	100	100	75	75
6. Autoclaved aerated concrete blocks, density 475 - 1200 kg/m³	180	100	100	100	62	50
7. Hollow concrete blocks, one cell in wall thickness, of Class 1 aggregate:
(a) 12.5mm cement-sand plaster	-	100	100	150	100	100
(b) 12.5mm gypsum-sand plaster	-	100	100	150	100	75
(c) 12.5mm gypsum-sand plaster	-	100	100	150	100	75
(d) 12.5mm gypsum-sand plaster	-	100	100	100	75	62
8. Hollow concrete blocks, one cell in wall thickness, of Class 2 aggregate:
(a) Unplastered	-	-	-	150	150	125
(b) 12.5mm cement-sand plaster	-	-	-	150	150	125
(c) 12.5mm gypsum-sand plaster	-	-	-	150	150	125
(d) 12.5mm vermiculite-gypsum plaster	-	-	-	125	100	100
9. Cellular clay blocks not less than 50% solid:
(a) 12.5mm cement-sand plaster	-	-	-	-	-	100
(b) 12.5mm gypsum-sand plaster	-	-	-	-	-	100
(c) 12.5mm vermiculite-gypsum plaster	-	-	-	200	100	100
10. Cavity wall with outer leaf of bricks or blocks of clay, composition, concrete or sand-lime, not less than 100mm thick and;
(a) inner leaf of bricks or blocks of clay, composition, concrete or sand-lime	100	100	100	75	75	75
(b) inner leaf of solid or hollow concrete bricks or blocks of Class 1 aggregate	100	100	100	75	75	75
11. Cavity wall with outer leaf of cellular clay blocks as 9 above and inner leaf of autoclaved aerated concrete blocks, density 480-1200kg/m³	150	100	100	75	75	75

A.2.2 Framed and composite construction (non-loadbearing)

Construction and materials		Period of fire resistance (in hours)
1.	Steel frame with external cladding of 16mm rendering on metal lathing and internal lining of autoclaved aerated concrete blocks, density 480-1120 kg/m³ of thickness of -
	(a) 50mm	2
	(b) 75mm	4
2.	Steel frame with external cladding of 100mm concrete blocks and internal lining of 16mm gypsum plaster on metal lathing	4
3.	Steel frame with external cladding of 16mm rendering on metal lathing and internal lining of 16mm gypsum plaster on metal lathing	1
4.	Steel frame with facings on each side of -
	(a) metal lathing with cement-sand or gypsum plaster of thickness of 19mm	1
	(b) metal lathing with vermiculite-gypsum or perlite-gypsum of thickness of -
	(1) 25mm	2
	(2) 12.5mm	1
	(c) 9.5mm plasterboard with vermiculite-gypsum of thickness of -
	(1) 25mm	2
	(2) 10mm	1
	(d) 12.5mm plasterboard with gypsum plaster of thickness of 12.5mm	1
	(e) 12.5mm plasterboard with vermiculite-gypsum plaster of thickness of -	2
	(1) 25mm	2
	(2) 10mm	1
	(f) 19mm plasterboard (or two layers of 9.5mm fixed to break joint) without finish	1
	(g) 19mm plasterboard for two layers of 9.5mm with vermiculite-gypsum plaster of thickness of 16mm	2
5.	Plasterboard 9.5mm cellular core partition with 22mm vermiculite-gypsum plaster	2
6.	Plasterboard 12.5mm cellular core partition -
	(a) 12.5mm gypsum plaster	1
	(b) 16mm vermiculite-gypsum plaster	2
7.	Plasterboard 19mm finished on both faces with 16mm gypsum plaster	1
8.	Three layers of 19mm plasterboard bonded with heat gypsum plaster	2

A.3 REINFORCED CONCRETE BEAMS

Description	Minimum dimension of concrete (in mm) to give a fire resistance in hours
Description	4-hrs	2-hrs	1-hrs
1. Reinforced concrete beams without any protection	Comply with SS EN 1992-1-2
2. As (1) with cement or gypsum plaster 15mm thick on light mesh reinforcement
(a) average concrete cover to main reinforcement	50*	30	15
(b) beam width	250	170	85
3. As (1) with vermiculite/ gypsum plaster** 15mm thick:
(a) average concrete cover to main reinforcement	25	15	15
(b) beam width	170	125	60
4. Light weight concrete	Comply with SS EN 1992-1-2
Note: * - Supplementary reinforcement necessary to hold the concrete cover in position. ** - Vermiculite/ gypsum plaster shall have a mix ratio in the range of 1 ½ - 2:1 by volume.

A.4 PRESTRESSED CONCRETE BEAMS

Description	Minimum dimension of concrete (in mm) to give a fire resistance in hours
Description	4-hrs	2-hrs	1-hrs
1. Prestressed concrete beams without any protection	Comply with SS EN 1992-1-2
2. As (1) with vermiculite concrete slabs 15mm thick, used as permanent shuttering:
(a) average concrete cover to main reinforcement	75	45	25
(b) beam width	210	125	70
3. As (2) but with 25mm thick slabs:
(a) average concrete cover to main reinforcement	65	35	15
(b) beam width	180	100	60
4. As (1) with 15mm thick gypsum plaster with light mesh reinforcement:
(a) average concrete cover to main reinforcement	90*	50	30
(b) beam width	250	170	85
5. As (1) with vermiculite/ gypsum plaster** 15m thick:
(a) average concrete cover to main reinforcement	75*	45	25
(b) beam width	170	125	60
6. As (5) but with 25mm thick coating:
(a) average concrete cover to main reinforcement	50	30	15
(b) beam width	140	85	60
7. Prestressed lightweight concrete without any protection	Comply with SS EN 1992-1-2
Note: * - Supplementary reinforcement is necessary to hold the concrete cover in position. ** - Vermiculite/ gypsum plaster shall have a mix ratio in the range of 1 ½ - 2:1 by volume.

A.5 REINFORCED CONCRETE COLUMNS

A.5.1 All Faces Exposed

Type of construction	Minimum dimension of concrete (in mm) to give a fire resistance in hours
	4-hrs	2-hrs	1-hrs
1. Dense concrete:
(a) without additional protection	Comply with SS EN 1992-1-2
(b) with cement or gypsum plaster 15mm thick on light mesh reinforcement	300	225	150
(c) with vermiculite/ gypsum plaster*	275	200	120
2. Lightweight aggregate concrete	Comply with SS EN 1992-1-2
Note: * - Vermiculite/ gypsum plaster shall have a mix ratio in the range of 1 ½ - 2:1 by volume.

A.5.2 One Face Exposed

Type of construction	Minimum dimension of concrete (in mm) to give a fire resistance in hours
	4-hrs	2-hrs	1-hrs
1. Dense concrete:
(a) without additional protection	Comply with SS EN 1992-1-2
(b) with Vermiculite/ gypsum plaster* 15mm thick on exposed faces	125	75	65
Note: * - Vermiculite/ gypsum plaster shall have a mix ratio in the range of 1 ½ - 2:1 by volume.

A.6 STRUCTURAL STEEL

A.6.1 Encased steel stanchions (Mass per metre not less than 45kg)

Construction and materials	Minimum thickness (in mm) of protection for a fire resistance of
Construction and materials	4-hrs	2-hrs	1-hrs
A. SOLID PROTECTION* (unplastered) 1. Concrete not leaner than 1:2:4 mix with natural aggregates-
(a) concrete not assumed to be load-bearing reinforced +	50	25	25
(b) concrete assumed to be load-bearing, reinforced in accordance with BS EN 1992 and SS EN 1994	75	50	50
2. Solid bricks of clay, composition or sand-lime	100	50	50
3. Solid blocks of foamed slag or pumice concrete reinforced+ in every horizontal joint	75	50	50
4. Sprayed vermiculite-cement	-	38	19
B. HOLLOW PROTECTION⁺⁺ 1. Solid bricks of clay, composition or sand-lime reinforced in every horizontal joint, unplastered	115	50	50
2. Solid blocks of foamed slag or pumice concrete reinforced+ in every horizontal joint, unplastered	75	50	50
3. Metal lathing with gypsum or cement-lime plaster of thickness of -	-	38^§	19
4. (a) Metal lathing with vermiculite-gypsum or perlite-gypsum plaster of thickness of	50^§	19	12.5
(b) Metal lathing spaced 25mm from flanges with vermiculite-gypsum or perlite-gypsum plaster of thickness of	44	19	12.5
5. Gypsum plasterboard with 1.6mm wire binding at 100mm pitch -
(a) 9.5mm Plasterboard with gypsum plaster of thickness of	-	-	12.5
(b) 19mm Plasterboard with gypsum plaster of thickness of	-	12.5	7
6. Gypsum plasterboard with 1.6mm wire binding at 100mm pitch -
(a) 9.5mm plasterboard with vermiculite-gypsum plaster of thickness of	-	16	10
(b) 19mm plasterboard with vermiculite- gypsum plaster of thickness of	38^§	20	10
7. Vermiculite - cement slabs of 4:1 mix reinforced with wire mesh and finished with plaster skim. Slabs of thickness of	63	25	25
Note: * - Solid protection means a casing which is bedded close to the steel without intervening cavities and with all joints in that casing made full and solid. + - Reinforcement shall consist of steel binding wire not less than 2.3mm in thickness, or a steel mesh weighing not less than 0.48kg/m². In concrete protection, the spacing of that reinforcement shall not exceed 150mm in any direction. ++ - Hollow protection means that there is a void between the protective material and the steel. All hollow protection to columns shall be effectively sealed at each floor level. § - Light mesh reinforcement required 12.5mm to 19mm below surface unless special corner beads are used.

A.6.2 Encased steel beams (Mass per metre not less than 30kg)

Construction and materials	Minimum thickness (in mm) of protection for a fire resistance of
Construction and materials	4-hrs	2-hrs	1-hrs
A. SOLID PROTECTION⁺ (unplastered) 1. Concrete not leaner than 1:2:4 mix with natural aggregates -
(a) concrete not assumed to be load-bearing, reinforced⁺⁺	75	25	25
(b) concrete assumed to be load-bearing, reinforced in accordance with BS 5950: Part 8	75	50	50
2. Sprayed vermiculite - cement	-	38	19
B. HOLLOW PROTECTION* 1. Metal lathing -
(a) with cement-lime plaster of thickness of	-	38	19
(b) with gypsum plaster of thickness of	-	22	16
(c) with vermiculite-gypsum or perlite-gypsum plaster of thickness of	32	12.5	12.5
2. Gypsum plasterboard with 1.6mm wire binding at 100mm pitch -
(a) 9.5mm plasterboard with gypsum plaster of thickness of	-	-	12.5
(b) 19 mm plasterboard with gypsum plaster of thickness of	-	12.5	7
3. Plasterboard with 1.6mm wire at 100m pitch -
(a) 9.5 mm plaster nailed to wooden cradles finished with gypsum plaster of thickness of	-	-	-
(b) 9.5 mm plasterboard with vermiculite - gypsum plaster of thickness of	-	16	10
(c) 19 mm plasterboard with vermiculite-gypsum plaster of thickness of	32	10	7
(d) 19 mm plasterboard with gypsum plaster of thickness of	-	20	10
4. Vermiculite-cement slabs of 4:1 mix reinforced with wire mesh and finished with plaster skim. Slabs of thickness of	63	25	25
Note: * - Hollow protection means that there is a void between the protective materials and the steel. All hollow protection to columns shall be effectively sealed at each floor level. + - Solid protection means a casing which is bedded close to the steel without intervening cavities and with all joints in that casing made full and solid. ++ - Solid protection means a casing which is bedded close to the steel without intervening cavities and with all joints in that casing made full and solid.

A.7 STRUCTURAL ALUMINIUM

A.7.1 Encased aluminium alloy stanchions and beams (Mass per metre not less than 16kg)

Construction and materials	Minimum thickness (in mm) of protection for a fire resistance of
Construction and materials	4-hrs	2-hrs	1-hrs
A. SOLID PROTECTION* 1. Sprayed vermiculite-cement	-	-	44
B. HOLLOW PROTECTION⁺ 1. Metal lathing with vermiculite-gypsum or perlite-gypsum plaster of thickness of	-	32	16
2. Metal lathing finished with neat gypsum plaster of thickness of	-	-	19
3. Gypsum plasterboard 19 mm thick with 1.6 mm wire binding at 100 mm pitch finished with gypsum-vermiculite plaster of thickness of	-	22	10
Note: * - Solid protection means a casing which is bedded close to the alloy without intervening cavities and with all joints in that casing made full and solid. + - Hollow protection means that there is a void between the protective material and the alloy. All hollow protection to columns shall be effectively sealed at each floor level.

A.8 REINFORCED CONCRETE FLOORS (DENSE CONCRETE)

Description	Minimum dimension (in mm) to give fire resistance in
	4-hrs	2-hrs	1-hrs
Solid floor slab, ribbed floor slab, hollow core slab.	Solid floor slab, ribbed floor slab, hollow core slab.

A.8 PRESTRESSED CONCRETE FLOORS (SILICEOUS OR CALCAREOUS AGGREGATE)

Floor Construction		Minimum dimension (in mm) to give fire resistance in
Floor Construction		4-hrs	2-hrs	1-hrs
1. Solid slab	Average cover to reinforcement	65*	40	25
1. Solid slab	Depth, overall⁺	150	125	100
2. Cored slabs in which the cores are circular or are higher than wide. Not less than 50 % of the gross across section of the floor shall be solid material	Average cover to reinforcement	65*	40	25
	Thickness under cores	50	40	25
	Depth, overall⁺	190	160	110
3. Hollow box section with one or more longitudinal cavities which are wider than high	Average cover to reinforcement	65*	40	25
	Thickness of bottom flange	65	40	25
	Depth, overall⁺	230	180	130
4. Ribbed floor with hollow infill blocks of clay, or inverted T-section beams with hollow infill blocks of concrete or clay. A floor in which less than 50% of the gross cross section is solid material must be provided with a 15mm plaster coating on soffit	Average cover to reinforcement	65*	40	25
	Width or rib, or beam, at soffit	125	90	70
	Depth, overall⁺	190	160	110
5. Upright T-section	Average bottom cover to reinforcement	100*	65*	40
	Side cover to reinforcement	100	65	40
	Least width or downstanding leg	250	150	90
	Thickness of flange+	150	125	100
6. Inverted channel sections with radius at intersection of soffits with top of leg not exceeding depth of section	Average bottom cover to reinforcement	100*	65*	40
	Side cover to reinforcement	50	35	20
	Least width or downstanding leg	125	75	45
	Thickness at crown⁺	150	125	100
7. Inverted channel sections or U-sections with radius at intersection of soffits with top of leg exceeding dept of section	Average bottom cover to reinforcement	100*	65*	40
	Side cover to reinforcement	50	35	20
	Least width or downstanding leg	110	70	45
	Thickness at crown⁺	150	125	100
Note: * - Supplementary reinforcement is necessary to hold the concrete cover in position. + - Non-combustible screeds and finishes can be included in these dimensions.

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