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9.25.3.3.(2)
ApplicationIntent
OH1OS3OS2OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F55-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Sealing or lapping of joints in flexible sheet materials installed to provide airtightness in 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].
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Intent
Intent 1: 
To limit the probability of openings in the joints of flexible sheet material (such as polyethylene) under in-service tensile stresses, which could lead to a loss of airtightness.
This is to limit the probability of:
  • 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.
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