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9.25.4.2.(5)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Membrane-type vapour barriers, other than polyethylene, in thermally insulated wall, ceiling and floor assemblies separating heated space from unheated space, exterior air or soil, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that the performance of membrane-type vapour barriers, other than polyethylene, will fall significantly below expectations with respect to:
  • pliability,
  • tensile strength,
  • elongation under load, and
  • water vapour permeance.
This is to limit the probability of uncontrolled water vapour diffusion into insulated assemblies, which could lead to condensation, which could lead to deterioration, which could lead to compromised structural integrity of assemblies acting as environmental separators, which could lead to harm to persons.
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