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

2.3.5 EXTERNAL WALL
2.3.5.1 External walls (including any external cladding or internal
lining) shall:
(a) Be constructed wholly of non-combustible materials.
(b) Be so constructed as to attain the fire resistance
required by this Standard.
2.3.5.2 Except where otherwise provided, unprotected areas in any
side of a station shall comply with the following:
(a) Any relevant requirements relating to the permitted
limits of unprotected areas specified in APPENDIX D
unless the station is so situated that such side may in
accordance with APPENDIX D consists entirely of
any unprotected area, and
(b) The extent of unprotected openings in an external wall
of a station in relation to its distance from the lot
boundary may be double that which is specified in
APPENDIX D when the station or compartment is
fitted throughout with an automatic sprinkler system in
compliance with the requirements in Section 2.5, and
(c) For the calculations of unprotected areas, platform
public areas shall be excluded from the unprotected
openings calculation, and
(d) Where a ground level entrance of an underground
station is a single storey structure with no habitable
room, the distance 'X' between the external wall of the
entrance and the external wall of an adjacent building
as shown in Diagram 2.3.5.2(d) shall comply with the
distance stipulated in APPENDIX D based on the
extent of unprotected openings in the external wall of
the adjacent building.
2.3.5.3 Cladding on external walls shall be of non-combustible
construction.
2.3.5.4 Any reference to APPENDIX D shall be construed as
referring to the provisions of Part I of that Appendix together
with (at the option of the person intending to erect the
building) the provisions of Part II.
Requirements
of external
walls
Unprotected
areas in any
side of a
station
Cladding on
external walls
Reference to
Part I-II of
APPENDIX D
Standard for Fire Safety in Rapid Transit Systems 58