ARCHIVED - 9.27.3.5.(1)

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9.27.3.5.(1)


Objective	OH1 Indoor Conditions
Attribution	[F61,F55-OH1.1,OH1.2,OH1.3]
Application	Application 1: 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.], where no sheathing is installed. 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, 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 installation or in-service damage to a single unsupported layer of sheathing membrane, which could lead to: precipitation ingress, or excessive air infiltration or “wind-washing,” which could lead to condensation or excessive heat transfer. This is to limit the probability of the failure of required environmental separation elements, which could lead to: 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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