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9.10.17.4.(1) | Application | Intent |
OS1 |
Objective | OS1 Fire Safety |
Attribution | |
Application | Application 1: Maximum surface flame-spread
rating of wall and ceiling finishes of exterior exit passageways,
including soffits beneath and guards on the passageways,
where the passageways provide the only means of egress from
rooms or suites they serve. This
applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent | Intent 1: To exempt wall and ceiling finishes in exterior exit passageways
from the requirements of Sentence 9.10.17.1.(1), which would otherwise
limit surface flame-spread rating to 150, and require a lower maximum flame-spread
rating on at least 90% of the surface areas, on the basis that the lower rating
is needed in these locations to protect persons during evacuation.
Intent 2: To limit the probability that certain finishes having an
inappropriately high flame-spread property will be used in certain passageways
that provide means of egress, which could lead to the spread of fire across
the exposed surfaces of the finishes, which could lead to delays in the evacuation
or movement of persons to a safe place, which could lead to harm to persons.
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