ARCHIVED - 3.4.6.5.(6)

This information has been archived because it is outdated and no longer relevant.

Archived Content

Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. As per the Communications Policy of the Government of Canada, you can request alternate formats on the "Contact Us" page.

3.4.6.5.(6)

Application

Intent

OS3


Objective	OS3 Safety in Use
Attribution	[F30-OS3.1]
Application	Application 1: Guard protection and design, with respect to position and lateral load, of a window in a stairway, where: the distance measured vertically between the bottom of the window and a line drawn through the outside edges of the stair nosings is less than 900 mm, or the window extends to less than 1 070 mm above the landing. This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A, to: interior and exterior exits, as stated in Appendix Note A-3.4.6., and exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1). Application 2: This also applies to: ramps, stairways and passageways used by the public as access to exits, as stated in Appendix Note A-3.4.6., tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), stairs in a means of egress from a roof, where a roof is used or intended for an occupant load of more than 60, as stated in Sentence 3.3.1.3.(4), ramps and stairways, as stated in Sentence 3.3.1.14.(1), and ramps in a barrier-free path of travel, as stated in Clause 3.8.3.4.(1)(e). Exceptions: except as stated in: Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building, Sentence 3.1.6.2.(2), which prohibits air-supported structures from being used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies, Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction, Sentence 3.3.1.3.(5), which applies to rooftop enclosures, Sentence 3.3.1.14.(2), which applies to service rooms, service spaces and industrial occupancies, Subsection 3.3.2., which applies to assembly occupancies, Sentence 3.3.4.7.(1), which applies to dwelling units, Sentence 3.4.2.2.(2), which applies to mezzanines that: are not required to terminate at a vertical fire separation [see Article 3.2.8.1.], are not intended for an occupant load more than 60, do not exceed the area limits for rooms and suites in Table 3.4.2.2., and have limited travel distances to egress doors or stairs, and Sentence 3.4.2.2.(3), which applies to at least half of the required means of egress from a mezzanine if the mezzanine is not required to terminate at a fire separation as permitted by Sentence 3.2.8.2.(1).
	Top of Page
Intent	Intent 1: To limit the probability that window glass will fail [break or splinter] if a person hits or bumps into it, which could lead to: harm to the person, and the person falling through the window, which could lead to harm to the person. Intent 2: To limit the probability that a person will fall through a window opening, which could lead to harm to persons. Intent 3: To expand the application of Articles 4.1.5.15. and 4.1.5.17. to a window.
	Top of Page