Back9.8.4.1.(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:

Uniformity of rise along top or bottom risers 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], where these risers adjoin a sloping finished walking surface.
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 relax the requirement stated in Sentence 9.8.4.1.(1) in cases where the top or bottom riser of flights of stairs adjoins a sloping finished walking surface.
This is to limit the probability that non-uniform rise will lead to
  • persons misstepping and tripping, or
  • persons misstepping and 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.