330
Partitions: Fire Safety
336
FIRE SAFETY
All partition components must be non-combustible. Materials must have a
maximum flame spread rating of 25 and a maximum smoke developed
rating of 50. When burnt, materials must not produce noxious or toxic
fumes.
Partitions surrounding vertical shafts and defining fire sections must be
two-hour rated and must extend from slab to slab. Two-hour slab-to-slab
partitions may also be required around special hazard areas such as
engineering shops, supply areas, etc. To facilitate change, these
particular two-hour partitions should be constructed in two sections
interrupted by the continuous ceiling-platform.
One-hour partitions, including smokestop partitions, will be required at
corridors and other locations defined by code. These need not extend
beyond the one-hour rated ceiling-platform. However, each service zone
above the ceiling should be designed as a smoke-tight compartment, and
"plenum barriers" should be installed where required.
To maintain adaptability, it is important that one-hour corridor and
smokestop partitions can be easily relocated by conversion of existing
non-rated partitions into rated partitions.
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