Sentence 9.25.3.3.(2)

  1. OH1
  2. OS3
  3. OS2
  4. OS1

Objective

OH1 Indoor Conditions

Attribution

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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