2024 Ontario Building Code Guide: Egress Requirements for Mezzanines and Dwelling Units
Sarah's Expert Insight
OBC Compliance Specialist
"Understanding the nuances of travel distances and exit requirements is essential for modern multi-storey developments and mezzanine additions. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in implementing these OBC safety standards across projects in Oakville, Muskoka, and London to ensure structural compliance and resident safety."
Navigating the 2024 Building Code Compendium is essential for safe and compliant residential and commercial builds. As a leading specialist, empcontracting.ca Inc. your construction contractor in London, Ontario, provides this breakdown of Sections 9.9.8.6 and 9.9.9 regarding egress standards.
9.9.8.6. Mezzanine Egress and Travel Distances
The egress from a mezzanine is strictly regulated based on area limits and travel distances to ensure occupant safety in the event of an emergency.
Travel Distance Limits
Except in specific circumstances, the maximum travel distance from any point on a mezzanine to the nearest exit must not exceed:
- 40 m: For business and personal services occupancies.
- 45 m: In floor areas protected by a full sprinkler system (excluding high-hazard industrial).
- 30 m: For any other floor area types.
Path of Travel and Egress Doors
Mezzanines must meet specific path-of-travel limits. One means of egress may lead through the room where the mezzanine is located, provided other exits are accessible directly at the mezzanine level. This is vital for maintaining compliance in open-concept industrial or commercial designs.
9.9.9. Egress from Dwelling Units
Proper exit placement in multi-storey dwellings is a cornerstone of Ontario building safety.
9.9.9.1. Travel Limit to Exits
In most dwelling units with more than one storey, residents should not have to travel more than one storey up or down to reach an egress door. This door must lead to a public corridor, an enclosed exit stair, or an exterior passageway at or near ground level.
Exceptions for Single-Suite Dwellings
Where a dwelling unit is not located above or below another suite, the one-storey limit may be exceeded if the floor level is served by an openable window or balcony. Windows used for this purpose must provide an unobstructed opening of at least 1 m in height and 0.55 m in width, with a sill height not exceeding 1 m above the floor.
9.9.9.2. Requirement for Two Separate Exits
For units opening onto public corridors, it is mandatory to have access to two separate exits in opposite directions unless the unit features a second, separate means of egress. This rule ensures that a single point of failure in a hallway does not trap occupants.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.