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9.4.2.1.(1)
ApplicationIntent
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Application
Application 1: 
Light-frame constructions whose wall, floor and roof planes are generally comprised of frames of small repetitive structural members, and where:
  • roof and wall planes are clad, sheathed or braced on at least one side,
  • the small repetitive structural members are spaced not more than 600 mm o.c.,
  • the clear span of any structural member does not exceed 12.2 m,
  • the maximum deflection of the structural roof members conforms to Article 9.4.3.1.,
  • the maximum total roof area, notwithstanding any separation of adjoining buildings by firewalls, is 4 550 m2, and
  • for flat roofs, there are no significant obstructions on the roof, such as parapet walls, spaced closer than the distance calculated by:
    where
    Do
    = minimum distance between obstructions, m,
    Ho
    = height of the obstruction above the roof, m,
    Ss
    = ground snow load, kPa, and
    γ
    = unit weight of snow, kN/m3.
This applies to 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 state the application of Subsection 9.4.2.
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