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.