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9.20.6.5.(2)
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Unreinforced and nominally reinforced masonry parapet walls, on 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 rain, or melting snow or ice, entering the cavities between wythes of masonry.
This is to limit the probability of the deterioration of elements in or below the parapet, which could lead to compromised structural integrity, which could lead to structural collapse, which could lead to harm to persons.
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