Ontario Building Code Guide: Exit Obstruction Requirements and Egress Safety (OBC 9.9.5)
Sarah's Expert Insight
OBC Compliance Specialist
"When managing renovations in London or high-density projects in Oakville and Muskoka, ensuring egress width compliance is critical to passing inspections and ensuring occupant safety. At empcontracting.ca Inc., your construction contractor in London, Ontario, we frequently see issues with door swing encroachment and misplaced service rooms, which is why precise planning according to OBC 9.9.5 is non-negotiable for any commercial or residential project."
Navigating the complexities of the 2024 Ontario Building Code (OBC) is essential for ensuring the safety and legal compliance of any building project. As you plan your next development, empcontracting.ca Inc. your construction contractor in London, Ontario, provides this detailed breakdown of Article 9.9.5 regarding obstructions in exits and means of egress.
Understanding Obstructions in Exits and Egress Routes
9.9.5.4. Prohibited Projections in Exits
Per the OBC, no fixture, turnstile, or construction element is permitted to project into the required width of an exit. Maintaining the full calculated width ensures that occupants can evacuate a building safely without bottlenecks or tripping hazards.
9.9.5.5. Width Restrictions and Visual Clarity
Obstructions such as posts or turnstiles must not restrict the width of a means of egress to less than 750 mm. If such restrictions exist, an alternate, unobstructed, and plainly visible means of egress must be provided immediately adjacent to the restriction. Specific exceptions apply for mercantile and business occupancies where certain areas are not accessible to the general public.
9.9.5.6. Visual Hazards: Mirrors and Draperies
To prevent confusion during an emergency, mirrors are strictly prohibited from being placed in or adjacent to exits in a manner that might mislead occupants regarding the direction of the exit. Furthermore, no mirrors or draperies are allowed to be placed on or over exit doors.
Prohibited Locations for Hazardous Equipment
9.9.5.7. and 9.9.5.8. Fuel-Fired Appliances and Service Rooms
Safety is paramount regarding mechanical systems. Fuel-fired appliances are prohibited within exits or corridors serving as access to exits. Additionally, service rooms containing high-pressure boilers (exceeding 100 kPa) or specific refrigerating and transformer equipment cannot be located directly beneath required exits.
9.9.5.9. Ancillary Room Connections
Except in the case of houses containing a secondary suite, rooms such as storage, laundry, or washrooms are not permitted to open directly into an exit. This regulation prevents potential fire or smoke spread from high-risk utility areas into primary evacuation routes.
9.9.6. Door Swing and Width Compliance
9.9.6.1. Obstructions by Doors
The physical swing of a door can technically become an obstruction. The OBC specifies that when fully open, swinging doors must not decrease the required exit width by more than 100 mm in exit corridors or 50 mm for other exit facilities. Precise measurement during the framing and door-hanging phase is critical for passing final inspections.
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.