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9.24.3.1.(4)
OH1OS2OP2OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Provision, installation and fastening of runners to support the ends of studs at openings, where the studs are not full wall height, in non-loadbearing exterior and interior walls of 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 limit the probability of inadequate means to anchor wall assemblies at openings, or inadequate means for the top and bottom attachment of cladding, sheathing or interior finish materials, which could lead to:
  • misaligned top and bottom ends of studs, or
  • the displacement of studs.
For assemblies that are required to provide fire resistance, this is to limit the probability of excessive movement, deformation or failure under expected loads, which could lead to compromised fire resistance of the assemblies, which could lead to harm to persons.
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