Warning This information has been archived because it is outdated and no longer relevant.

Archived Content

Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. As per the Communications Policy of the Government of Canada, you can request alternate formats on the "Contact Us" page.

5.2.1.2.(1)
ApplicationIntent
OH1OS2OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F51,F55,F61,F63-OH1.1,OH1.2]
Application
Application 1: 
Determination of interior environmental loads on building materials, components, assemblies and their interfaces described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Application 2: 
This also applies to the position of low air and vapour permeance materials within the building assembly relative to the position of materials providing thermal resistance in the assemblies of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the building assembly:
  • incorporates low permeance materials that act as other than cladding or that are installed on the warm side of the assembly, and
  • is more susceptible to condensation [see Sentences 9.25.1.2.(4) and (5) for combinations of interior and exterior environmental conditions that create a higher risk for condensation].
Application 3: 
This also applies to the design of vapour barriers in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the building assembly is more susceptible to condensation [see Sentences 9.25.4.2.(2) and (3) for combinations of interior and exterior environmental conditions that create a higher risk for condensation].
Top of Page
Intent
Intent 1: 
To limit the probability that inappropriate assumptions will be made with regard to interior environmental load in the design of environmental separators, which could lead to the inadequate performance or premature failure of components and assemblies of environmental separators under expected environmental loads, which could lead to:
  • air infiltration and exfiltration,
  • condensation,
  • precipitation ingress, or
  • moisture ingress from the ground.
This is to limit the probability of:
  • the inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to further compromised integrity of environmental separators, or
  • pollutant ingress, including soil gas, combustion products from parking garages, or particulates.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, and
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
Intent 2: 
To direct Code users to a source of information commonly used for defining interior environmental loads.
Top of Page