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9.20.8.1.(1)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Above-ground, loadbearing walls of hollow masonry units, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • supporting roof or floor framing members,
  • 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 9.20.8.1.(2), which applies where the roof framing is supported on a wood plate, and
  • 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 an inadequate distribution of roof or floor loads, which could lead to over-stressing of hollow masonry units, which could lead to cracking.
This is to limit the probability of:
  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration,
  • in assemblies exposed to moisture or the exterior, damage and deterioration, or
  • an inability to resist expected loads, which could lead to excessive deflection or vibration of floors.
For floors and elements supporting floors, this is to limit the probability of persons losing their balance, tripping or falling, which could lead to harm to persons.
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