3.4.6.9.(2)

Objective

OS3 Safety in Use

Attribution

Intent

Intent 1:

To exempt curved stairs from the prohibition in Sentence 3.4.6.9.(1) regarding tapered treads, if certain measures are taken.

This is to limit the probability that:

  • handrails on each side of the stairs will not be provided,
  • treads in the steps will be improperly designed with respect to uniformity, run dimension and leading edge, and
  • the inside radius of the stairs will be of insufficient dimension.

This is to limit the probability of:

  • delays in the evacuation or movement of persons to a safe place in an emergency situation, which could lead to harm to persons, and
  • persons tripping or falling, which could lead to harm to persons.

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