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9.25.4.2.(6) | Application | Intent |
| OS2 | OH1 |
| Objective | OS2 Structural Safety |
| Attribution | |
| Application | Application 1: Determination of the permeance of coatings applied
to gypsum board to function as a vapour barrier 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 coatings
applied to gypsum board to function as a vapour barrier will fall significantly
below expectations with respect to water vapour permeance, which could lead
to uncontrolled water vapour diffusion into insulated 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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