ARCHIVED - 9.27.2.2.(5)

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9.27.2.2.(5)


Objective	OH1 Indoor Conditions
Attribution	[F61,F62-OH1.1,OH1.2,OH1.3]
Application	Application 1: Protection against precipitation ingress by cladding assemblies to which Subsection 9.27.2. applies [see Article 9.27.1.1. for application of Subsection 9.27.2.], where: the number of degree-days is less than 3400 and the moisture index is greater than 0.90, or the number of degree-days is 3400 or more, and the moisture index is greater than 1.00. Exceptions: except as stated in: Sentence 9.27.2.1.(1), which applies where it can be shown that precipitation ingress will not adversely affect occupant health or safety, and Sentence 9.27.2.2.(6), which applies where it can be shown that the omission of a capillary break will not adversely affect the performance of building assemblies the building is an accessory building the exterior walls as well as intersecting or supported floors are constructed with non-moisture-susceptible materials, or the exterior walls are constructed as mass walls with sufficient thickness to minimize the transfer of moisture to interior spaces.
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Intent	Intent 1: To limit the probability of precipitation or meltwater ingress, or an inadequate dissipation of moisture from behind the cladding. This is to limit the probability of: compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to an inadequate control of the temperature of interior spaces or relative humidity, the generation of pollutants from biological growth or from materials that become unstable on wetting, the ingress of water into interior spaces, or deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls. This is to limit the probability of: negative effects on the air quality of indoor spaces, the inadequate thermal comfort of persons, or contact with moisture. This is to limit the probability of harm to persons.
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