Back9.25.3.2.(1)

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F55

To resist the transfer of air through environmental separators.

Objective:

OH1.1, OH1.2, OH1.3

 

APPLICATION:

Characteristics of required air barrier systems, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of an inadequate resistance of air barrier system components to air pressure loads, which could lead to:
  • rupturing, tearing or puncturing at fasteners, or
  • the opening of joints.
This is to limit the probability of a loss of airtightness, which could lead to:
  • excessive heat loss or gain due to air mass transfer,
  • excessive air infiltration and exfiltration,
  • excessive airborne vapour transfer from interior above ground and exterior below ground, or
  • precipitation ingress due to air pressure differences.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces, drafts, indoor relative humidity, or water accumulation,
  • pollutant ingress from the exterior, including combustion products from parking garages, or particulates,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of assemblies acting as or protected by environmental separators
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:

F20

To support and withstand expected loads and forces.

F55

To resist the transfer of air through environmental separators.

Objective:

OS2.3

 

APPLICATION:

Characteristics of required air barrier systems, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of an inadequate resistance of air barrier system components to air pressure loads, which could lead to:
  • rupturing, tearing or puncturing at fasteners, or
  • the opening of joints.
This is to limit the probability of a loss of airtightness, which could lead to:
  • condensation, or
  • precipitation ingress due to air pressure differences.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of assemblies acting as or protected by environmental separators, which could lead to harm to persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F44

To limit the spread of hazardous substances beyond their point of release.

Objective:

OS1.1

 

APPLICATION:

Characteristics of required air barrier systems, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of an inadequate resistance of air barrier system components to air pressure loads, which could lead to:
  • rupturing, tearing or puncturing at fasteners, or
  • the opening of joints.
Where the air barrier system separates a garage, or suite containing a garage, from residential space, this is to limit the probability of a loss of airtightness, which could lead to gas and fumes migrating from the garage into the remainder of the building, which could lead to the accumulation of gas and fumes and their subsequent ignition by a nearby ignition source, which could lead to a fire or explosion, which could lead to harm to persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F44

To limit the spread of hazardous substances beyond their point of release.

Objective:

OS3.4

 

APPLICATION:

Characteristics of required air barrier systems, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of an inadequate resistance to air pressure loads, which could lead to:
  • the air barrier rupturing, tearing or puncturing at fasteners, or
  • the opening of joints in the air barrier.
Where the air barrier system separates a garage, or suite containing a garage, from residential space, this is to limit the probability of a loss of airtightness, which could lead to the leakage of carbon monoxide gas into living space, which could lead to the asphyxiation or acute poisoning of persons.