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a flame-spread rating greater than Class A as defined in Section
10.2.6.3 of this IRR are exposed, shall be effectively fire-stopped as
provided below, with approved materials, unless the space is sprinkled
in accordance with Section 10.2.6.5 of this IRR.
a. Every exterior and interior wall and partition shall be firestopped at
each level, at the top storey ceiling level, and at the level of
support for roofs.
b. Every unoccupied attic space shall be subdivided by firestops into
areas not to exceed two hundred eighty (280) square meters.
c. Any concealed space between the ceiling and the floor or roof
above shall be firestopped for the full depth of the space along
the line of support of the floor or roof structural members and, if
necessary at other locations to form areas not to exceed ninety
three square meters (93 m 2 ) for any space between the ceiling
and floor and two hundred eighty square meters (280 m 2 ) for any
space between the ceiling and the roof.
2. In every existing building, firestopping shall be provided as required by
the provisions of Divisions 8 through 17 of this Chapter.
SECTION 10.2.6.3
INTERIOR FINISH
A. General
1. Interior finish means the exposed interior surfaces of buildings including,
but not limited to fixed or movable walls and partitions, columns, and
ceilings. For requirements on decorations and furnishing, see
paragraph B of Section 10.2.18.1 of this IRR.
2. A finish floor or covering shall be exempt from the requirements of this
Section provided however; that in any case where the City/Municipal
Fire Marshal having jurisdiction finds a floor surface of unusual hazard
the floor surface shall be considered a part of the interior finish for the
purposes of this Chapter.
3. Interior finish materials shall be grouped in the following classes, in
accordance with their flame spreads rating.
a. Class A Interior Finish
Flame Spread 0.25. Include any material classified at 25 or less on
the test scale described in paragraph (4) hereof. Any element
thereof when so tested shall not continue to propagate fire;
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