ARCHIVED - 9.27.3.6.(2)

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9.27.3.6.(2)


Objective	OH1 Indoor Conditions
Attribution	[F20,F61,F55-OH1.1,OH1.2,OH1.3]
Application	Application 1: Installation of plywood, hardboard, OSB, waferboard, or fibre cement cladding, 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 membrane is installed. Exceptions: except as stated in: Sentence 9.27.2.2.(4), which applies to exterior walls that enclose spaces of residential occupancy or spaces that directly serve spaces of residential occupancy, Clause 9.27.2.2.(5)(a), which applies to cladding assemblies where the number of degree-days is less than 3400 and the moisture index is greater than 0.90, or Clause 9.27.2.2.(5)(b), which applies to cladding assemblies where the number of degree-days is 3400 or more, and the moisture index is greater than 1.00.
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Intent	Intent 1: To limit the probability of: 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. Intent 2: To clarify the application of Sentence 9.27.3.6.(1).
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