Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 82

2. Where the occupant load served does not exceed three, spiral stairs
shall be permitted, provided that the following criteria are met:
a. The clear width of the stairs shall be not less than six hundred sixty
millimeters (660 mm).
b. The height of risers shall not exceed two hundred forty millimeters
(240 mm).
c. The headroom shall be not less than one hundred ninety-eight
centimeters (198 cm).
d. Treads shall have a depth of not less than one hundred ninety
millimeters (190 mm) at a point three hundred five millimeters (305
mm) from the narrower edge.
e. All treads shall be identical.
f.
Handrails shall be provided on both sides of the stairway.
3. Where the occupant load served does not exceed five, existing spiral
stairs shall be permitted, provided that the requirements of para D 2(a)
through (e) above are met.
E. Winders
Where allowed in Division 8 through Division 17 of this Chapter, winders
shall be permitted in stairs, provided that the same shall have a tread
depth of not less than one hundred fifty millimeters (150 mm) and a tread
depth of not less than two hundred eighty millimeters (280 mm) at a point
three hundred five millimeters (305 mm) from the narrowest edge.
F. Enclosure
1. All interior stairways shall be enclosed in accordance with the
provisions of Section 10.2.5.2 and Section 10.2.6.2 of this IRR, except
insofar as open stairways are permitted by paragraph "A" (2) of
Section 10.2.6.2 of this IRR.
2. There shall be no enclosed, usable space within an exit enclosure,
including under stairs, nor shall any open space within the enclosure
be used for any purpose that has the potential to interfere with egress.
G. Stair Details
1. All stairs serving as required means of egress shall be of permanent
fixed construction.
Each new stair and platform, landing, balcony and stair hallway floor
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