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6.3.1.5.(1)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Materials and installation of access ladders for chimneys, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2).
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Intent
Intent 1: 
To limit the probability that:
  • inappropriate materials for ladders will lead to:
    • inadequate strength to support expected loads, or
    • an inability to resist exposure to the environment, which could lead to corrosion, or
  • the inappropriate construction of ladders will lead to inadequate strength to support expected loads.
This is to limit the probability of failure of ladders when in use, which could lead to harm to persons.
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