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9.8.3.2.(1)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum number of risers for interior flights of stairs, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for stairs within dwelling units.
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Intent
Intent 1: 
To limit the probability that users will not see the steps, which could lead to:
  • persons tripping or falling, or
  • persons tripping or falling in an emergency, which could lead to delays in evacuation or movement of persons to a safe place.
This is to limit the probability of harm to persons.
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