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9.10.9.7.(1)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2] [F04-OS1.3]
Application
Application 1: 
Combustible piping used in any part of a drain, waste and vent piping system, where any part of that system partly or wholly penetrates:
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in:
  • Sentence 9.10.9.1.(1), which applies to separations between rooms and spaces within dwelling units,
  • Sentences 9.10.9.7.(2) and (3), which apply to piping that is not located in a vertical shaft and that is sealed at the penetration by a fire stop system that has an F rating not less than the fire-resistance rating required for the fire separation,
  • Sentence 9.10.9.7.(4), which applies to drain piping that leads directly from a noncombustible water closet through a concrete floor slab,
  • Sentence 9.10.9.7.(5), which applies to piping that is on one side only of a vertical fire separation, and
  • Sentence 9.10.9.7.(6), which applies to piping that is on one side only of a horizontal fire separation, in buildings that contain 2 dwelling units only.
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Intent
Intent 1: 
To limit the probability that combustible piping penetrating rated assemblies will contribute to the growth and spread of fire within the assemblies, which could lead to the structural failure and collapse of the assemblies, which could lead to harm to persons.
Intent 2: 
To limit the probability that combustible piping penetrating rated fire separations will contribute to the growth and spread of fire within the fire separations, which could lead to a loss of integrity of the fire separations, which could lead to the spread of fire and smoke from one fire compartment to another, which could lead to harm to persons in the other compartment.
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