Code Library › Volume 1 › Section 3.2 — Building Fire Safety
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.2.3.20.Underground Walkway

(1) An underground walkway shall not be designed or used for any purpose other than pedestrian travel unless (a) the purpose is permitted, and (b) sprinklers are installed in any space in the walkway containing an occupancy. (2) Buildings connected by an underground walkway shall be separated from the walkway by a fire separation with a fire-resistance rating not less than 1 h. (3) An underground walkway shall be of noncombustible construction suitable for an underground location. (4) In an underground walkway (a) smoke barrier doors shall be installed at intervals of not more than 100 m, or (b) the travel distance from the door of an adjacent room or space to the nearest exit shall be not more than one and a half times the least allowable travel distance to an exit for any of the adjacent occupancies as permitted by Sentence 3.4.2.5.(1). (5) An underground walkway between buildings shall be not more than 9 m wide.
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Common questions about this part of the code

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.