Functional Statement:


To minimize the risk of injury to persons as a result of tripping, slipping, falling, contact, drowning or collision.


To facilitate the timely movement of persons to a safe place in an emergency.


OS3.1, OS3.7



Configuration of interior and exterior stairs, in buildings to which Part 9 applies [see Sentence of Division A for application of Part 9].


To limit the probability that excessive variance in the configuration of a stair will excessively disrupt the gait of users, which could lead to:
  • persons misstepping and tripping, or
  • persons misstepping and tripping in an emergency -- when traffic flow is expected to be limited owing to the presence of exit stairs as an alternate option or to the limited number of occupants in dwelling units -- which could lead to delays in the evacuation or movement of persons to a safe place.
This is to limit the probability of harm to persons.