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3.4.6.1.(2)
OS3OP1OS1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Design, with respect to ice and snow accumulations, of treads and landings of exterior exit stairs more than 10 m high.
This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A to:
Application 2: 
This also applies to:
Exceptions: 
except as stated in:
  • Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • 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,
  • 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,
  • Sentence 3.3.1.3.(5), which applies to rooftop enclosures,
  • 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
  • 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 ice and snow will accumulate on treads and landings of exterior exit stairs, which could lead to delays in the evacuation or movement of persons to a safe place in an emergency, which could lead to harm to persons.
Intent 2: 
To limit the probability that ice and snow will accumulate on treads and landings of exterior exit stairs, which could lead to emergency responders being delayed or ineffective in carrying out their emergency response operations, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 3: 
To limit the probability that exterior exit stairs will be obstructed or slippery, which could lead to persons tripping, slipping or falling, which could lead to harm to persons.
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