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9.29.5.10.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
[F81-OS1.2] Applies where the finishing of joints is required to maintain required fire-resistance ratings.
Application
Application 1: 
Minimum temperature for taping and finishing single-layer installations of gypsum board interior wall and ceiling finishes on wood furring or framing, 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: 
Where the finishing of joints is required to maintain required fire-resistance ratings, to limit the probability of incomplete drying of gypsum wallboard cement, which could lead to inadequate adhesive characteristics, which could lead to delamination, which could lead to a loss of fire resistance, which could lead to the growth and spread of fire, which could lead to harm to persons.
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