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4.1.6.2.(6)
OS2OP2
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
Application
Application 1: 
Slope factor for calculating the specified snow load on unobstructed slippery sloped areas of roofs and other building surfaces subject to snow accumulation.
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.
Exceptions: 
except as stated in Sentence 4.1.6.2.(7), which specifies a slope factor of 1.0 when used in conjunction with shape factors for increased snow loads as given in:
  • Clause 4.1.6.2.(8)(b), which applies to sloped roofs in roof valleys, and
  • Clause 4.1.6.2.(8)(e), which applies to sloped roofs subject to snow sliding or meltwater draining from adjacent roofs.
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Intent
Intent 1: 
To limit the probability that the slope factor will not take into account the site conditions affecting the maximum expected accumulation of snow on unobstructed slippery sloped roofs, which could lead to the excessive deformation of, or excessive stress in, the structural components, which could lead to damage to the building.
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