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9.25.4.1.(1)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Vapour barriers for thermally insulated wall, ceiling and floor assemblies separating heated space from unheated space, exterior air or exterior 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 of an uncontrolled diffusion of water vapour from air in heated space into insulated wall, ceiling and floor assemblies.
This is to limit the probability of 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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