ARCHIVED - 9.27.3.3.(3)

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9.27.3.3.(3)


Objective	OH1 Indoor Conditions
Attribution	[F61-OH1.1,OH1.2,OH1.3]
Application	Application 1: Horizontal lapping of wall sheathing membranes installed in cladding assemblies to which Subsection 9.27.3. applies [see Article 9.27.1.1. for application of Subsection 9.27.3.]. 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, Article 9.27.3.4., which applies where non-wood-based rigid exterior insulating sheathing or exterior insulating sheathing with an integral sheathing membrane is installed, Article 9.27.3.5., which applies where wall sheathing is not installed, and Article 9.27.3.6., which applies where the joints between the sheets of cladding are formed in such a manner that they are unlikely to allow the passage of wind or rain.
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Intent	Intent 1: To limit the probability of an inability to direct water to the exterior, which could lead to precipitation ingress, which could lead to the failure of required environmental separation elements. This is to limit the probability of: compromised thermal performance of components intended to resist heat transfer, which could lead to an inadequate control of the temperature of interior spaces 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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