Warning This information has been archived because it is outdated and no longer relevant.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

3.6.4.3.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Protection of openings through ceiling membranes, where the concealed space referred to in Sentence 3.6.4.3.(1) within a floor assembly or within a roof assembly:
  • is used as a return-air plenum, and
  • incorporates a ceiling membrane that forms part of the required fire-resistance rating of the ceiling assembly.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Top of Page
Intent
Intent 1: 
To limit the probability that a fire in a space below a ceiling membrane that forms part of a required fire-resistance rating of the ceiling assembly will spread into the plenum space through openings in the ceiling membrane, which could lead to the premature failure of the assembly, which could lead to the further spread of fire to other parts of the building, which could lead to harm to persons.
Intent 2: 
To make Appendix D information a requirement with respect to the protection of openings through ceiling membranes.
Top of Page