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9.19.2.1.(2)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F82-OH1.1,OH1.2]
Application
Application 1: 
In buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], minimum size of access hatches to attic or roof spaces that measure:
  • not less than 3 m2 in area,
  • not less than 1 m in length or width, and
  • not less than 600 mm in height over an area not less than 3 m2 and not less than 1 m in length or width.
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Intent
Intent 1: 
To limit the probability of:
  • the deterioration of building components going undetected, which could lead to
    • condensation and the accumulation of moisture, or
    • the formation of ice dams, or
  • the need to demolish building components in order to gain access.
This is to limit the probability of:
  • the ingress of water, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of ceilings acting as environmental separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, and
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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