1. OS2
  2. OP2
  3. OH1


OH1 Indoor Conditions



Intent 1:

To limit the probability of a chemical reaction between aluminum and alkali, which could lead to the premature failure of aluminum flashing, which could lead to:

  • precipitation or meltwater ingress, or
  • compromised thermal performance of components intended to resist heat transfer.

This is to limit the probability of:

  • an inadequate control of temperatures in interior spaces, relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to further compromised integrity of 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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