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9.8.4.3.(2)
ApplicationIntent
OS3
ObjectiveOS3 Safety in Use
Attribution
[F30-OS3.1] [F10-OS3.7]
Application
Application 1: 
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].
Application 2: 
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).
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Intent
Intent 1: 
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.
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