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Understanding OBC 9.9.10.1
The Ontario Building Code (OBC), specifically section 9.9.10.1, outlines the mandatory requirements for egress windows in bedrooms. These rules are designed to ensure that in the event of a fire or emergency, occupants have a safe and accessible way to escape, and first responders have a way to enter.
The Golden Rules:
- The window must provide an unobstructed opening area of at least 3.8 ft² (0.35 m²).
- No single dimension (width or height) can be less than 15 inches (380 mm).
- The window must be openable from the inside without special tools or knowledge.
Common Mistakes to Avoid
Measuring the Glass
Don't measure the glass pane! You must open the window and measure the actual open space designated for a person to crawl through.
Ignoring Window Wells
A compliant window is useless if it opens into a tiny window well. The well must also provide 760mm (approx 30") of clearance in front of the window.
Need to Enlarge Your Windows?
If your current basement windows don't meet these standards, Installix specializes in concrete cutting and egress window installation across the GTA. We ensure full code compliance.
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