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9.27.10.5.(1)
ApplicationIntent
OH1OS2OP2
ObjectiveOH1 Indoor Conditions
Attribution
[F21-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Minimum clearance between door or window frames and hardboard cladding, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of cladding jamming upon linear expansion due to an increase in moisture content from exposure to precipitation, which could lead to buckling, which could lead to:
  • the displacement of cladding, trim and flashing, opening of joints or failure of caulking, or
  • where panel-type siding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i), insufficient strength to resist lateral loads, which could lead to racking of exterior walls.
This is to limit the probability of:
  • precipitation or meltwater 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 of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls, or
  • water accumulation in interior spaces.
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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