ARCHIVED - 9.20.12.2.(2)

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9.20.12.2.(2)


Objective	OP2 Structural Sufficiency of the Building
Attribution	[F20-OP2.1,OP2.4] [F20-OP2.3] Applies to elements that support or are part of an environmental separator.
Application	Application 1: In buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], corbeling of unit-masonry foundation walls supporting above-ground, unreinforced masonry cavity walls that are thicker than the foundation wall on which they rest: 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 9.20.1.1.(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 that the cavity wall's centre of gravity will be too far outboard of its supporting foundation, which could lead to excessive eccentricity of loads, which could lead to cracking of cavity walls. 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: 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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