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SECTION
703 FIRE-RESISTANCE RATINGS AND FIRE TESTS
703.2
Fire-resistance ratings. The fire-resistance rating of
building elements shall be determined in accordance with the
test procedures set forth in ASTM E 119 or in accordance with
Section 703.3. Where materials, systems
or devices that have not been tested as part of a fire-resistance-rated
assembly are incorporated into the assembly, sufficient data
shall be made available to the building official to show that
the required fire-resistance rating is not reduced. Materials
and methods of construction used to protect joints and penetrations
in fire-resistance-rated building elements shall not reduce
the required fire-resistance rating.
Exception: In determining the fire-resistance rating of
exterior bearing walls, compliance with the ASTM E 119 criteria
for unexposed surface temperature rise and ignition of cotton
waste due to passage of flame or gases is required only for
a period of time corresponding to the required fire-resistance
rating of an exterior nonbearing wall with the same fire separation
distance, and in a building of the same group. When the fire-resistance
rating determined in accordance with this exception exceeds
the fire-resistance rating determined in accordance with ASTM
E 119, the fire exposure time period, water pressure, and
application duration criteria for the hose stream test of
ASTM E 119 shall be based upon the fire-resistance rating
determined in accordance with this exception.
703.2.1 Nonsymmetrical wall construction. Interior walls
and partitions of nonsymmetrical construction shall be tested
with both faces exposed to the furnace, and the assigned
fire-resistance rating shall be the shortest duration obtained
from the two tests conducted in compliance with ASTM E 119.
When evidence is furnished to show that the wall was tested
with the least fire-resistant side exposed to the furnace,
subject to acceptance of the building official, the wall
need not be subjected to tests from the opposite side (see
Section 704.5 for exterior walls).
703.2.2 Combustible components. Combustible aggregates
are permitted in gypsum and portland cement concrete mixtures
approved for fire-resistance-rated construction. Any approved
component material or admixture is permitted in assemblies
if the resulting tested assembly meets the fire-resistance
test requirements of this code.
703.2.3 Restrained classification. Fire-resistance-rated
assemblies tested under ASTM E 119 shall not be considered
to be restrained unless evidence satisfactory to the building
official is furnished by the registered design professional
showing that the construction qualifies for a restrained
classification in accordance with ASTM E 119. Restrained
construction shall be identified on the plans.
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