2024 Ontario Building Code Guide: Air Admittance Valves for London Renovations
Sarah's Expert Insight
OBC Compliance Specialist
"In London and Oakville's high-end renovations, AAVs are essential for installing kitchen islands or basement suites where traditional stack venting would compromise structural integrity or aesthetic finishes. At empcontracting.ca Inc., we strictly adhere to the 2024 OBC accessibility and temperature requirements for these valves, ensuring long-term plumbing reliability and odor-free operation for our clients."
Understanding OBC Section 7.5.9: Air Admittance Valves (AAVs)
The 2024 Ontario Building Code provides specific pathways for modern plumbing solutions, particularly when traditional venting is not feasible. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure your project utilizes these regulations to maximize efficiency and maintain code compliance.
Proper Application of Air Admittance Valves
According to OBC Article 7.5.9.2, Air Admittance Valves (AAVs) are permitted primarily for fixtures in buildings undergoing renovation or where a standard vent connection is impractical. To remain compliant, these valves must be installed:
- At least 100 mm above the fixture drain being vented.
- At least 150 mm above any insulation materials.
- Only to vent fixtures located on the same storey.
- Connected specifically to the horizontal fixture drain.
Installation and Accessibility Standards
Section 7.5.9.3 mandates that AAVs remain accessible and are placed in locations with sufficient air circulation. They must never be installed in supply or return air plenums, nor in any area where they may be exposed to freezing temperatures. Furthermore, every drainage system must still feature at least one vent that terminates outdoors to ensure proper atmospheric pressure equalization.
Vent Sizing for Specialized Tanks and Sumps
Under Article 7.5.8.5, the length of the vent pipe is not considered when sizing circuit vents, relief vents, or vents for interceptors and sewage tanks. This allows for more flexible design configurations in complex residential or commercial mechanical rooms in the London and Oakville regions.
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.