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403.2.3.1 Wall assembly.
The wall assemblies making up the enclosures for interior exit stairways and elevator hoistway enclosures shall meet or exceed Soft Body Impact Classification Level 2 as measured by the test method described in ASTM C 1629 / C 1629M.
403.2.3.2 Wall assembly materials.
The face of the wall assemblies making up the enclosures for interior exit stairways and elevator hoistway enclosures that are not exposed to the interior of the enclosures for interior exit stairways or elevator hoistway enclosure shall be constructed in accordance with one of the following methods:
1. The wall assembly shall incorporate no fewer than two layers of impact-resistant construction board each of which meets or exceeds Hard Body Impact Classification Level 2 as measured by the test method described in ASTM C 1629 / C 1629M.
2. The wall assembly shall incorporate no fewer than one layer of impact-resistant construction material that meets or exceeds Hard Body Impact Classification Level 3 as measured by the test method described in ASTM C 1629 / C 1629M.
3. The wall assembly incorporates multiple layers of any material, tested in tandem, that meets or exceeds Hard Body Impact Classification Level 3 as measured by the test method described in ASTM C 1629 / C 1629M.
403.2.3.3 Concrete and masonry walls.
Concrete or masonry walls shall be deemed to satisfy the requirements of Sections 403.2.3.1 and 403.2.3.2.
403.2.3.4 Other wall assemblies.
Any other wall assembly that provides impact resistance equivalent to that required by Sections 403.2.3.1 and 403.2.3.2 for Hard Body Impact Classification Level 3, as measured by the test method described in ASTM C 1629 / C 1629M, shall be permitted.
403.2.4 Sprayed fire-resistant materials (SFRM).
The bond strength of the SFRM installed throughout the building shall be in accordance with Table 403.2.4.
Height of Building a | SFRM Minimum Bond Strength |
Up to 420 feet | 430 psf |
Greater than 420 feet | 1,000 psf |
For SI: 1 foot = 304.8 mm, 1 pound per square foot (psf) = 0.0479 kW/m
2
.
a. Above the lowest level of fire department vehicle access.
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