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9.20.14.1.(1)
OS2OP2OH1OS1OH4OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F80-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Minimum temperature, during and following installation, of mortar and masonry, including mortar and masonry in foundations, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
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Intent
Intent 1: 
To limit the probability of inadequate curing conditions, which could lead to a weak mortar-to-masonry bond or an inadequate resistance to freeze-thaw stresses.
Where masonry construction is required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
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