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9.10.17.5.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Maximum surface flame-spread rating of wall surfaces in unsprinklered public corridors.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to:
  • occupancies in corridors, as stated in Sentence 9.10.17.7.(1), and
  • corridors in construction camps that provide access to exit and have a fire-resistance rating of not less than 45 min, as stated in Sentence 9.10.21.6.(2).
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Intent
Intent 1: 
To exempt wall surfaces in unsprinklered public corridors 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 certain portions 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 public corridors that are part of a 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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