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9.23.8.2.(1)
ApplicationIntent
OS2OP2OH1OS1OS3OH4
ObjectiveOH1 Indoor Conditions
Attribution
[F80-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Surface protection for exterior steel beams that are:
  • used to support floors, and
  • exposed to the weather.
This applies in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
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Intent
Intent 1: 
To limit the probability of inadequate moisture protection, which could lead to an unacceptably high rate of surface corrosion, which could lead to a loss of strength, which could lead to an inability to resist expected gravity loads.
For construction that supports environmental separators, this is to limit the probability of the displacement or failure of required environmental separation elements, which could lead to:
  • condensation,
  • precipitation ingress,
  • excessive heat transfer,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.
This is to limit the probability of:
  • inadequate control of temperatures of 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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