ARCHIVED - 9.20.5.2.(2)

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9.20.5.2.(2)


Objective	OH1 Indoor Conditions
Attribution	[F20,F22-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application	Application 1: Steel angle lintels supporting masonry veneer over openings, 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 does not exceed 11 m in height above the foundation wall, 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: lintels that are inadequate in size or have an excessive span, which could lead to the excessive deflection or failure of lintels, which could lead to the cracking or structural failure of masonry veneer over openings, or an inadequate bearing area between lintels and supported masonry veneer, which could lead to shear or compression failure of masonry veneer. Where masonry units support or are part of an environmental separator, this is to limit the probability of: excessive moisture transfer through masonry units, or deformation or cracking, which could lead to the displacement or failure of required environmental separation elements. This is to limit the probability of: condensation, precipitation ingress, moisture ingress, excessive heat transfer, pollutant ingress, or compromised thermal performance of components intended to resist heat transfer. This is to limit the probability of: an inadequate control of temperatures in interior spaces, drafts, relative humidity or water accumulation, the generation of pollutants from biological growth or from materials that become unstable on wetting, or deterioration, which could lead to further compromised integrity of environmental separators. This is to limit the probability of: negative effects on the air quality of indoor spaces, the inadequate thermal comfort of persons, and contact with moisture. This is to limit the probability of harm to persons.
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