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9.20.14.1.(1)
OS2OP2OH1OS1OH4OS3
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20,F80-OP2.3] Applies to elements that support or are part of an environmental separator or are exposed to moisture.
Application
Application 1: 
Minimum temperature, during and following installation, of mortar and masonry, including mortar and masonry in foundations, 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.
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Intent
Intent 1: 
To limit the probability of inadequate curing conditions, which could lead to a weak mortar-to-masonry bond or an inadequate resistance to freeze-thaw stresses.
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:
    • the excessive movement or deformation of walls, or
    • the excessive deflection or vibration of floors.
This is to limit the probability of:
  • the space being unsuitable for its intended use,
  • compromised operation of windows or doors, or
  • damage to the building.
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