The Ontario Building Code | Ramps and Stairways
3.3.1.13. Ramps and Stairways
(1) Except as permitted by Sentence (2), Article 3.3.4.7. and Subsection 3.3.2., ramps and stairways that do not serve as exits shall conform to the dimensional, guard, handrail and slip-resistance requirements for exit ramps and stairways of Sentence 3.4.3.2.(7) and Articles 3.4.3.5. and 3.4.6.1. to 3.4.6.9.
(2) Ramps and stairways that do not conform to the requirements of Sentence (1) and are intended only for occasional use for servicing equipment and machinery are permitted,
(a) to serve service rooms and service spaces, and
(b) in industrial occupancies.
In Plain Language
This clause addresses dead-end corridors, sections of corridor that don't lead directly toward an exit, capping how far a dead end can extend since occupants travelling into one could be trapped if fire blocks their only way back out.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.