1. OH1
  2. OS2
  3. OP2
  4. OS1
  5. OH4
  6. OS3


OH1 Indoor Conditions


[F20-OH1.1,OH1.2,OH1.3]Applies to elements that support or are part of an environmental separator.


Intent 1:

To limit the probability of inadequate lateral stiffness of framed walls, which could lead to an inability to resist lateral loads or inadequate distribution of gravity loads, which could lead to cracking or buckling.

Where wood-frame walls support an environmental separator, this is to limit the probability of deformation or cracking, which could lead to the displacement or failure of required environmental separation elements.

This is to limit the probability of:

  • condensation,
  • precipitation ingress,
  • moisture ingress,
  • excessive heat transfer,
  • pollutant 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, drafts, 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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