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9.20.9.4.(5)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Filling the space between wythes that are tied together with rod-type metal ties, in above-ground masonry walls that consist of 2 or more wythes, 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:
  • for cavity walls and masonry veneer/masonry backing walls, 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 support for ties, which could lead to the excessive flexing of ties under lateral loads, which could lead to inadequate load distribution among the wythes of multiple-wythe masonry walls, which could lead to an inability to resist transverse or vertical loads, which could lead to cracking or buckling.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure of masonry construction, or
  • where masonry construction is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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