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4.1.6.2.(8)
ApplicationIntent
OS2OP2OS2OP2
ObjectiveOS2 Structural Safety
Attribution
(a) to (e) [F20-OS2.1] Applies to roof shapes and configurations that call for a higher shape factor.
Application
Application 1: 
Shape factor for calculating the specified snow load for roof areas, whose value accounts for:
  • non-uniform snow loads on gable, arched or curved roofs and domes,
  • increased snow loads in roof valleys,
  • increased non-uniform snow loads due to snow drifting onto a roof that is at a level lower than other parts of the same building or at a level lower than another building within 5 m of it,
  • increased non-uniform snow loads on areas adjacent to roof projections, such as penthouses, large chimneys and equipment, and
  • increased snow or ice loads due to snow sliding or meltwater draining from adjacent roofs.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.
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Intent
Intent 1: 
To limit the probability that the shape factor will not take into account the roof configuration affecting the maximum expected accumulation of snow on local areas of the roof, which could lead to structural failure, which could lead to harm to persons.
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