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9.20.9.1.(2)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum overlap of joints in reinforcing for above-ground, nominally unreinforced masonry with aligned head joints, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • not exceeding 11 m in height above the foundation wall,
  • in which the roof or floor system above the first storey is not of concrete construction, and
  • where vertical joints in adjacent courses are not offset in accordance with Sentence 9.20.9.1.(1).
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 an inadequate resistance to in-plane and transverse shear stresses, which could lead to cracking or structural failure of vertical mortar joints.
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, 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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