Warning This information has been archived because it is outdated and no longer relevant.

Archived Content

Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. As per the Communications Policy of the Government of Canada, you can request alternate formats on the "Contact Us" page.

9.4.2.2.(2)
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Minimum snow loads to be taken into consideration for light-frame constructions where 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 span of any structural member does not exceed 12.20 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].
Exceptions: 
except as exempted in Sentence 9.4.2.2.(3), which applies to bow string, arch and semi-circular roof trusses.
Top of Page
Intent
Intent 1: 
To limit the probability that the design live load for the roof will be less than the anticipated load from maintenance workers and their equipment, which could lead to the collapse of the roof, which could lead to harm to persons.
Top of Page