Back9.19.1.2.(5)

ATTRIBUTION:

Functional Statement:

F42

To resist the entry of vermin and insects.

F51

To maintain appropriate air and surface temperatures.

F61

To resist the ingress of precipitation, water or moisture from the exterior or from the ground.

F62

To facilitate the dissipation of water and moisture from the building.

Objective:

OS2.3

 

APPLICATION:

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.

INTENT:

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.

ATTRIBUTION:

Functional Statement:

F42

To resist the entry of vermin and insects.

F51

To maintain appropriate air and surface temperatures.

F61

To resist the ingress of precipitation, water or moisture from the exterior or from the ground.

F62

To facilitate the dissipation of water and moisture from the building.

Objective:

OH1.1, OH1.1, OH1.2, OH1.3

 

APPLICATION:

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.

INTENT:

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:
  • compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to an inadequate control of the temperature of interior spaces,
  • the generation of pollutants from insects or biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of ceilings acting as environmental separators, or
  • water accumulation in interior spaces.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.

ATTRIBUTION:

Functional Statement:

F42

To resist the entry of vermin and insects.

Objective:

OH2.5

 

APPLICATION:

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.

INTENT:

To limit the probability that the performance of vents will fall significantly below expectations with respect to protection against the ingress of insects, which could lead to an infestation of insects, which could lead to unsanitary conditions, which could lead to harm to persons.