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9.17.4.3.(1)
ApplicationIntent
OS2OP2OH4OH1OS3
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: 
Moisture protection for wood columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are supported on concrete in contact with the ground, and that are used to support:
  • beams carrying loads from not more than 2 wood-frame floors where
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible, exterior platforms, or 1 level plus roof, where
    • the supported length of joists supported by such beams or rim joists does not exceed 5 m
    • the sum of the specified snow and occupancy loads on the platform type construction or roof does not exceed 4.8 kPa
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.
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Intent
Intent 1: 
To limit the probability of columns having inadequate moisture protection, which could lead to the entry of moisture into the end grain of wood columns, which could lead to rotting, which could lead to structural failure of columns.
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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