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9.20.11.1.(4)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F20,F22-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum extension of anchors connecting parallel roof or floor joists to above-ground masonry walls to provide the required lateral support, 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:
  • where floor joists are located not more than 1 m above grade where the lateral load on the wall will be less than it would be if the joists were located at a point higher up the wall [see Sentence 9.20.11.1.(1)], and
  • 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 inadequate strength of floor or roof joists to resist lateral loads, which could lead to inadequate anchorage of floor or roof assemblies to masonry walls, which could lead to inadequate lateral stiffness, which could lead to an inability to resist lateral loads or inadequate distribution of gravity loads, which could lead to cracking or buckling.
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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