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


OH1 Indoor Conditions


[F20,F22-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 strength of individual members,
  • discontinuity of individual members, which could lead to compromised resistance to buckling, or
  • compromised load transfer among members.

This is to limit the probability:

  • that the column members will be unable to resist expected vertical loads, which could lead to buckling of individual members,
  • of compromised resistance to buckling, or
  • of unequal load sharing among members of built-up wood columns, which could lead to progressive structural failures of column members.

For columns that support exterior walls or roofs, this is to limit the probability of excessive deformation or deflection, or compromised air barrier systems, which could lead to:

  • condensation,
  • precipitation ingress, or
  • compromised thermal performance of components intended to provide resistance to 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
  • further compromised integrity of environmental separators, which could lead to the deterioration of building elements.

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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