Back9.8.4.3.(2)

ATTRIBUTION:

Functional Statement:

F30

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

F10

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

Objective:

OS3.1, OS3.7

 

APPLICATION:

Tread depth for rectangular treads in interior and exterior stairs, for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
This also applies to stairs within dwelling units in buildings to which Part 3 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 3], as stated in Sentence 3.3.4.7.(1).

INTENT:

To limit the probability:
  • that users will place their foot off the tread or incorrectly place their foot on the tread, or
  • of excessive depth beyond the nosing of the upper tread, which could lead to users positioning their foot too far under the upper tread.
This is to limit the probability of:
  • persons misstepping or tripping, or
  • persons misstepping or tripping in an emergency, 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.