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3.4.6.5.(7)
ApplicationIntent
OS3
ObjectiveOS3 Safety in Use
Attribution
[F30-OS3.1]
Application
Application 1: 
Design, with respect to resistance to climbing, of guards for stairs, ramps and landings.
This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A, to:
Application 2: 
This also applies to:
  • ramps, stairways and passageways used by the public as access to exits, as stated in Appendix Note A-3.4.6.,
  • tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1),
  • stairs in a means of egress from a roof, where a roof is used or intended for an occupant load of more than 60, as stated in Sentence 3.3.1.3.(4),
  • ramps and stairways, as stated in Sentence 3.3.1.14.(1), and
  • ramps in a barrier-free path of travel, as stated in Clause 3.8.3.4.(1)(e).
Exceptions: 
except:
  • where it can be shown that the location and size of openings do not present a hazard,
  • as stated in Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • as stated in Sentence 3.1.6.2.(2), which prohibits air-supported structures from being used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies,
  • as stated in Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction,
  • as stated in Sentence 3.3.1.3.(5), which applies to rooftop enclosures,
  • as stated in Sentence 3.3.1.14.(2), which applies to service rooms, service spaces and industrial occupancies,
  • as stated in Subsection 3.3.2., which applies to assembly occupancies,
  • as stated in Sentence 3.3.4.7.(1), which applies to dwelling units,
  • as stated in Sentence 3.4.2.2.(2), which applies to mezzanines that:
    • are not required to terminate at a vertical fire separation [see Article 3.2.8.1.],
    • are not intended for an occupant load more than 60,
    • do not exceed the area limits for rooms and suites in Table 3.4.2.2., and
    • have limited travel distances to egress doors or stairs, and
  • as stated in Sentence 3.4.2.2.(3), which applies to at least half of the required means of egress from a mezzanine if the mezzanine is not required to terminate at a fire separation as permitted by Sentence 3.2.8.2.(1).
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Intent
Intent 1: 
To limit the probability that persons will climb a guard and fall, which could lead to harm to persons.
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