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9.20.13.1.(1)
OS2OP2OH1OS1
ObjectiveOS1 Fire Safety
Attribution
[F80-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Materials used for, and minimum thicknesses of, flashing of masonry, 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.
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of using inappropriate flashing materials or installing an inadequate thickness of flashing, which could lead to premature failure of flashing upon exposure to moisture, sunlight, temperature extremes or mechanical stresses.
Where masonry construction is required to provide fire resistance, 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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