2024 Ontario Building Code: Essential Guide to Exit Requirements for Construction in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"Navigating the strict exit requirements for Group C and D occupancies is a common challenge for our clients in London and Oakville. At empcontracting.ca Inc. your construction contractor in London, Ontario, we meticulously calculate travel distances and occupant loads early in the design phase to determine if a single-exit configuration is viable, which can significantly optimize floor space for urban developments and Muskoka-based commercial retreats."
When planning your next commercial or residential project, understanding the 2024 Ontario Building Code (OBC) exit requirements is critical for safety and compliance. As empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these life-safety standards in every build.
General Exit Safety and Material Standards
OBC 3.4.1.8 - 3.4.1.11: Visibility and Materials
The code sets strict guidelines for materials used in exit paths to prevent confusion and ensure durability during emergencies:
- Transparent Panels: All glass and transparent doors within an exit must meet specific safety requirements to prevent accidental impact.
- Mirror Restrictions: Mirrors are strictly prohibited near exits if they could confuse the direction of travel for occupants attempting to leave the building.
- Combustible Glazing: To maintain fire integrity, combustible glazing is not permitted in the walls, ceilings, or closures of exit enclosures.
- Long-Term Care Safety: For residents in long-term care homes, open exterior stairways cannot serve as a primary means of egress for any floor above the second storey.
Minimum Number of Exits from Floor Areas
OBC 3.4.2.1: The Two-Exit Rule
In accordance with OBC 3.4.2.1., every floor area intended for occupancy must generally be served by at least two exits. This ensures a redundant path of travel should one exit be compromised by fire or smoke.
Permitted Exceptions for Single-Exit Floor Areas
A single exit may be permitted for buildings up to two storeys in height if the occupant load does not exceed 60. However, specific travel distance and floor area limitations apply. For non-sprinklered buildings, the following criteria from Table 3.4.2.1.-A must be met:
| Occupancy Type | Max Floor Area (m²) | Max Travel Distance (m) |
|---|---|---|
| Group A (Assembly) | 150 | 15 |
| Group C (Residential) | 100 | 15 |
| Group D (Business/Office) | 200 | 25 |
| Group E (Mercantile/Retail) | 150 | 15 |
| Group F, Div 2 (Industrial) | 150 | 10 |
| Group F, Div 3 (Industrial) | 200 | 15 |
For sprinklered floor areas, the travel distance is capped at 25m, and floor areas must comply with Table 3.4.2.1.-B values.
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.