Sentence 9.19.1.2.(5)

  1. OS2
  2. OH1
  3. OH2

Objective

OS2 Structural Safety

Attribution

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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