Warning This information has been archived because it is outdated and no longer relevant.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

9.23.4.5.(1)
ApplicationIntent
OS2OP2OH1OS1OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.5]
[F22-OS2.4,OS2.5]
[F20,F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Reduction in maximum spans for wood joists, rafters, lintels and ridge beams, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], used to support roofs with roofing materials that are heavier than:
  • asphalt shingles,
  • wood shingles or shakes,
  • built-up roofing,
  • selvage asphalt roofing,
  • sheet metal,
  • glass-reinforced polyester,
  • hot-applied rubberized asphalt, or
  • polyvinyl chloride sheet.
Top of Page
Intent
Intent 1: 
To limit the probability of excessively long spans, which could lead to roofs being unable to support additional loads imposed by heavier roofing materials, which could lead to excessive movement, deformation or damage to roofing.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction, or
  • where wood-frame construction supports or is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
Top of Page