The last sentence of Section 715.4 requires the spandrel wall to
comply with the requirements of Section 705.8.5. This coordinates
with the requirements from Section 715.5 and will be discussed with
that code section.
The exception within Section 715.4 recognizes that curtain wall
assemblies with vision glass that extends to the floor cannot meet
the test criteria in ASTM E 2307 and that prior to the 2009 IBC
these systems could be tested using conditions specified within the
exception. The option of using materials or systems that have been
subjected to an ASTM E 119 time-temperature fire condition under
positive pressure should provide a reasonable level of protection.
This will allow designs or systems that were tested and used in the
years prior to the development of the ASTM E 2307 standard. Figure
5.9 illustrates the location of the glazing and the requirements of the
exception.
VISION GLASS EXTENDS
TO FINISHED FLOOR LEVEL
APPROVED MATERIAL
SECURELY INSTALLED TO
SEAL VOID.
PROTECTION IS AT LEAST
EQUAL TO TIME PERIOD
OF FLOOR ASSEMBLY.
MATERIAL CAPABLE OF
RESISTING PASSAGE OF
FLAME AND HOT GASES
UNDER CONDITIONS OF
THE ASTME E119 TIME-
TEMPERATURE CONDITIONS.
(Fig 5.9 Protection of Floor/Wall Intersection with Full-Height Glazing)
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