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9.23.15.7.(3)
OS2OP2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Asphalt-coated or asphalt-impregnated fibreboard roof sheathing conforming to CAN/ULC-S706, “Wood Fibre Thermal Insulation for Buildings,” in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], where:
  • supports are spaced not more than 400 mm o.c., and
  • the roofing consists of a continuous sheet of galvanized steel not less than 0.33 mm in thickness or a continuous sheet of aluminum not less than 0.61 mm in thickness.
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Intent
Intent 1: 
To limit the probability of inadequate stiffness or strength, which could lead to an inability to resist expected gravity and lateral loads, which could lead to damage to roofing.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction, or
  • precipitation ingress, which could lead to deterioration, which could lead to further compromised structural integrity of the roof.
This is to limit the probability of harm to persons.
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