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3. Stairs Details
Fire escape stairs, depending upon the requirement of Division 8
through 17 of this Chapter, shall be in accordance with the following
table and subsequent paragraphs.
Table 6: DIMENSIONAL CRITERIA FOR FIRE ESCAPE STAIRS
DIMENSIONS
PARTICULARS
Minimum widths
Minimum horizontal dimension
any landing of platform
Maximum rise
Minimum tread, exclusive of
nosing
60 cm clear between rails
60 cm
23 cm
23 cm
Solid, 13 mm diameter perforation
permitted
None
None
Tread construction
Winders (spiral)
Risers
Maximum height between
landings
Headroom, minimum
3.66 m
2.00 m
Door or casement windows 61 cm by
1.98 m or double hung windows 76.20
cm by 91.44 cm clear
Not over 30.50 cm above floor; steps if
higher
Swinging stair section permitted
45 per unit* access by door; 20 if
access by climbing over window rail
Access to escape
Level of access opening
Discharge to ground
Capacity number of persons
4. Arrangement and Protection of Openings
Fire escape stairs shall be so arranged that they will be exposed by
the smallest possible or window and door openings. There shall be no
transom over doors. Every opening, any portion of which is in the limits
specified below, shall be completely protected by approved fire
doors or metal-frame wired glass windows in the same manner as
provided for outside stairs and outside ramps.
5. Access
a. Access to fire escape stairs shall be provided in accordance with
the table in para “A” (3) of this Section and the general provisions
of paragraph “K” Section 10.2.5.2 of this IRR.
b. Where access is by way of double windows, such windows shall be
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