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9.19.1.2.(5)
ApplicationIntent
OS2OH1OH2
ObjectiveOS2 Structural Safety
Attribution
[F42,F51,F61,F62-OS2.3]
Application
Application 1: 
Vents for attic or roof spaces, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where insulation is installed above the ceiling and below the roof sheathing.
Exceptions: 
except as stated in:
  • Sentence 9.19.1.1.(1), where attic or roof space venting can be shown to be unnecessary, and
  • Sentence 9.19.1.4.(1), which applies to the lower portions of mansard or gambrel roofs.
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Intent
Intent 1: 
To limit the probability that the performance of vents will fall significantly below expectations with respect to:
  • material integrity and durability, including corrosion resistance, which could lead to the premature failure of vents,
  • flashing provided by flanges,
  • wind and rain resistance,
  • protection against the ingress of insects or vermin, and
  • net ventilating area.
This is to limit the probability of:
  • precipitation ingress,
  • an infestation of insects or vermin, and
  • insufficient venting, which could lead to:
    • condensation, or
    • the formation of ice dams, which could lead to the ingress of water.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of attic or roof assemblies or of elements protected by attic or roof assemblies, which could lead to harm to persons.
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