Warning This information has been archived because it is outdated and no longer relevant.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

9.23.13.10.(2)
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Minimum depth of lumber ceiling joists supporting struts or dwarf walls that in turn support roof rafters, where the roof slope is 1 in 4 or less, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
Top of Page
Intent
Intent 1: 
To limit the probability of inadequate strength, which could lead to an inability to resist bending stress imposed by struts or dwarf walls in addition to other expected gravity and lateral loads, which could lead to:
  • the failure of the roof or of the ceiling joists, or
  • the excessive deflection of the roof, which could lead to the opening of joints.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction,
  • where roof and ceiling framing members support required elements of environmental separators, the excessive deformation, displacement or failure of these elements, which could lead to deterioration, which could lead to further compromised structural integrity of roofs or environmental separators, or
  • where roof and ceiling framing members support assemblies exposed to the exterior, excessive water ingress, which could lead to deterioration.
This is to limit the probability of harm to persons.
Intent 2: 
To limit the application of Sentence (1) for constructions where support for increased roof loads has to be provided.
Top of Page