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9.20.8.2.(2)
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Floor joists supported on cavity walls, 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 the exposure of joist ends to water that might penetrate the exterior wythe of cavity walls, which could lead to rotting of wood floor joists, which could lead to structural collapse, which could lead to harm to persons.
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