SECTION
711 HORIZONTAL ASSEMBLIES.
711.1
General. Floor and roof assemblies required to have a
fire-resistance rating shall comply with this section.
711.2
Materials. The floor and roof assemblies shall be of materials
permitted by the building type of construction.
711.3
Fire-resistance rating. The fire-resistance rating of
floor and roof assemblies shall not be less than that required
by the building type of construction. Where the floor assembly
separates mixed occupancies, the assembly shall have a fire-resistance
rating of not less than that required by Section
508.3.2 based on the occupancies being separated. Where
the floor assembly separates a single occupancy into different
fire areas, the assembly shall have a fire resistance rating
of not less than that required by Section
706.3.9. Floor assemblies separating dwelling units in
the same building or sleeping units in occupancies in Group
R -1, hotel occupancies, R - 2 and I -1 shall be a minimum
of l-hour fire-resistance-rated construction.
Exception:
Dwelling unit and sleeping unit separations in buildings of
Type lIB, IIIB, and VB construction shall have fire-resistance
ratings of not less than 1/2 hour in
buildings equipped throughout with an automatic sprinkler
system in accordance with Section
903.3.1.1.
711.3.1
Ceiling panels. Where the weight of lay-in ceiling panels,
used as part of fire-resistance-rated floor/ceiling or roof/ceiling
assemblies, is not adequate to resist an upward force of
1 lb/ft2 (48 Pa), wire or other approved devices
shall be installed above the panels to prevent vertical
displacement under such upward force.
711.3.2
Access doors. Access doors shall be permitted in ceilings
of fire-resistance-rated floor/ceiling and roof/ceiling
assemblies provided such doors are tested in accordance
with ASTM E 119 as horizontal assemblies and labeled by
an approved agency for such purpose.
711.3.3
Unusable space. In 1-hour fire-resistance-rated floor
construction, the ceiling membrane is not required to be
installed over unusable crawl spaces. In 1-hour fire-resistance-rated
roof construction, the floor membrane is not required to
be installed where unusable attic space occurs above.
711.4
Continuity. Assemblies shall be continuous without openings,
penetrations or joints except as permitted by this section
and Sections 707.2, 712.4,
713 and 1020.1.
Skylights and other penetrations through a fire-resistance-rated
roof deck or slab are permitted to be unprotected, provided
that the structural integrity of the fire-resistance-rated
roof construction is maintained. Unprotected skylights shall
not be permitted in roof construction required to be fire-resistance
rated in accordance with Section 704.10.
The supporting construction shall be protected to afford the
required fire-resistance rating of the horizontal assembly
supported.
711.5
Penetrations. Penetrations of
fire-resistance-rated horizontal assemblies shall
comply with Section 712.
711.6
Joints. Joints made in or between fire-resistance-rated
horizontal assemblies shall comply with Section
713. The void created at the intersection of a floor/ceiling
assembly and an exterior curtain wall assembly shall be protected
in accordance with Section 713.4.
711.7 Ducts and air transfer
openings. Penetrations in horizontal assemblies by ducts
and air transfer openings shall comply with Sections
716.
711.8 Floor fire door assemblies.
Floor fire door assemblies used to protect openings in fire-resistance-rated
floors shall be tested in accordance with NFPA 288, and shall
achieve a fire-resistance rating not less than the assembly
being penetrated. Floor fire door assemblies shall be labeled
by an approved agency.
The label shall be permanently affixed and shall specify the
manufacturer, the test standard and the fire-resistance rating
.
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