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9.29.9.2.(5)
OS2OP2OH1OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies where interior finishes are required to act as fire protection for foamed plastics.
Application
Application 1: 
Panel marks on interior wall and ceiling finishes of OSB conforming to CAN/CSA-O325.0, “Construction Sheathing,” in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to the protection of foamed plastics that form part of a wall or ceiling assembly in combustible construction:
  • in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Clause 9.10.17.10.(1)(a), and
  • in buildings to which Part 3 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 3] that are permitted to be of combustible construction, as stated in Clause 3.1.4.2.(1)(a).
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Intent
Intent 1: 
To limit the probability of installing interior finishes of inadequate strength or rigidity, which could lead to an inability to resist expected impact, gravity or lateral loads.
This is to limit the probability of the deformation or detachment of interior finishes, which could lead to--where interior finishes are required to protect foamed plastics--a loss of fire protection.
This is to limit the probability of the growth and spread of fire, which could lead to harm to persons.
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