Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

In this Appendix:
APPENDIX C
NOTIONAL PERIODS OF FIRE RESISTANCE
(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:
(i) In the case of an external wall 1m or more from the relevant boundary, plaster applied on the
internal face only;
(ii) In the case of any other wall, plaster applied on both faces;
(iii) 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;
(iv) If to vermiculite-gypsum plaster, vermiculite-gypsum plaster of a mix within the range of 1 ½ 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
four hours.
(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 Regulations,
1989 and the relevant Singapore Standard or Singapore Standard Code of Practice in respect of the material
or such matters. In the absence of a Singapore Standard or Singapore Code of Practice on the material or
such matters, the relevant British Standard or British Code of Practice or other accepted Standard or Code
of Practice shall be applicable.
A. Masonry construction:
PART I : WALLS
Minimum thickness excluding plaster (in mm) for
period of fire resistance of
Construction and materials Loadbearing Non-loadbearing
1. Reinforced concrete, minimum concrete cover to main
reinforcement of 25 mm:
(a) Unplastered (to comply with SS CP 65 Part 2)
(b) 12.5mm cement-sand plaster
(c) 12.5mm gypsum-sand plaster
(d) 12.5mm vermiculite-gypsum plaster
2. No-fines concrete of Class 2 aggregate:
(a) 13mm cement-sand plaster
(b) 13mm gypsum-sand plaster
(c) 13mm vermiculite-gypsum plaster
3. Bricks of clay, concrete or sand - lime:
(a) Unplastered
(b) 13mm cement-sand plaster
(c) 13mm gypsum-sand plaster
(d) 13mm vermiculite-gypsum or perlite-gypsum
plaster
4
hours
2
hours
Standard for Fire Safety in Rapid Transit Systems C-1
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180
125
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200
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200
100
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75
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100
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hour
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75
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63
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150
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170
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170
100
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100
1
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75