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9.20.11.4.(1)
ApplicationIntent
OH1OS2OP2
ObjectiveOH1 Indoor Conditions
Attribution
[F20-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Anchorage of wood-frame roof systems to exterior masonry walls, where the roof does not provide lateral support to the walls, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except as stated in:
  • Sentence 9.20.11.4.(2), which applies where anchorage is provided by nailing the wall furring strips to the side of the rafter plate, and
  • Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of shear failure, anchor withdrawal or inadequate distribution of lateral and wind-uplift loads, which could lead to the displacement of wood-frame roof systems under wind-uplift loads.
This is to limit the probability of deformation or deflection of roofing, which could lead to the excessive deformation, displacement or failure of required environmental separation elements.
This is to limit the probability of:
  • condensation,
  • precipitation ingress,
  • moisture ingress,
  • excessive heat transfer,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures in 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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