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9.20.13.12.(1)
OH1OS2OP2OS1
ObjectiveOS1 Fire Safety
Attribution
[F61,F62-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Drips for window sills in masonry walls having no flashing installed beneath them, 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 water running back under window sills or down the face of masonry, which could lead to water ingress.
Where masonry veneer is installed to provide the required noncombustible cladding, this is to limit the probability of deterioration, which could lead to compromised fire resistance of the assembly, which could lead to harm to persons.
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