Intent 1:
To exempt roof assemblies from the requirements
of Sentence 9.10.8.1.(1), which would otherwise require roof
assemblies to have a minimum fire-resistance rating, if certain conditions
are met [i.e. the building is sprinklered and the sprinkler system
meets certain operational conditions].
This is
to limit the probability that:
- a fire will not be controlled or suppressed, which could
lead to exposure of the roof assembly to fire, which could lead to
the premature failure or collapse of the roof assembly,
- deficiencies in the sprinkler system will go unnoticed,
which could lead to the sprinkler system not operating properly in
a fire situation, which could lead to the fire not being controlled
or suppressed, which could lead to exposure of the roof assembly to
fire, which could lead to the premature failure or collapse of the
roof assembly, or
- delays in notification of the fire department will occur,
which could lead to fire emergency response operations being delayed,
which could lead to
- delays in the evacuation or movement of persons to a
safe place, or
- the spread of fire to other parts of the building.
This is to limit the probability of harm to persons.
Intent 2:
To expand the application of Sentences 9.10.8.1.(1) and 3.2.4.9.(3) to Part 9 buildings.