ARCHIVED - 9.20.5.1.(1)

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9.20.5.1.(1)


Objective	OH1 Indoor Conditions
Attribution	[F20,F21-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application	Application 1: Support of unreinforced solid masonry, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], used in: above-ground, unreinforced masonry and masonry veneer walls and nominally reinforced masonry where vertical joints in adjacent courses are aligned [see Article 9.20.9.1.]: 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, interior masonry foundation walls not subject to lateral earth pressure [see Sentence 9.15.4.10.(1)], in regions where the spectral response acceleration S_a(0.2) is greater than 0.55, loadbearing masonry elements of buildings more than 1storey in building height [see Sentence 9.20.1.2.(1)]: 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, in regions where the spectral response acceleration S_a(0.2) is greater than 0.35 and less than or equal to 0.55, loadbearing masonry elements of buildings 3 storeys in building height [see Sentence 9.20.1.2.(2)]: 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, and masonry cavity walls. 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, Sentence 9.20.6.4.(4), which applies to masonry veneer individually supported by the structural backing, and Sentence 9.20.6.6.(1), which applies to slab facings and precast concrete panel facings.
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Intent	Intent 1: To limit the probability of excessive deflection, shrinkage or uneven settlement of elements or constructions that support masonry. 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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