2024 Ontario Building Code Venting Standards: A Guide by empcontracting.ca Inc.
Sarah's Expert Insight
OBC Compliance Specialist
"At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize the 'future-use' provisions in Section 7.5.5.5, which are vital for custom builds in Oakville and Muskoka where homeowners often plan for basement suites later. Correct grease interceptor venting is also a frequent focus for our commercial clients in London to ensure long-term OBC compliance and prevent costly drainage failures."
Navigating the complexities of the 2024 Ontario Building Code (OBC) is essential for ensuring the safety and longevity of your plumbing systems. As the leading experts at empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every project adheres to these critical venting regulations.
Specialized Venting: Grease Interceptors and Corrosive Waste
Section 7.5.5.2. & 7.5.5.3.
Proper venting of grease interceptors is vital for commercial kitchen performance. The code requires a vent pipe within 1,500 mm of the inlet, sized between NPS 1½ and NPS 2, complete with a cleanout. For systems dealing with corrosive waste, dilution tanks must be vented independently and terminate outdoors to prevent the accumulation of hazardous gases.
Future-Proofing and Fresh Air Inlets
Section 7.5.5.4. & 7.5.5.5.
The OBC mandates that building traps include a fresh air inlet of at least NPS 4, located within 1.2 m of the trap. Additionally, for any building where plumbing may be installed in the future, the system must be sized accordingly. Every storey, including the basement, must have a vent pipe of at least NPS 1½ extended into it to facilitate these future connections without major structural demolition.
The Geometry of Venting: Arrangement and Connections
Section 7.5.6.1. & 7.5.6.2.
The physical arrangement of vent pipes is strictly regulated to prevent moisture collection. Vents must be installed without depressions and as directly as possible to a vent stack. When connecting to horizontal sanitary drainage, the connection must be made above the horizontal centre line to ensure air flow is never obstructed by waste. Any unused vents for future expansions must be permanently capped with a cleanout or plug to maintain system integrity.
Location and Trap Protection (Section 7.5.6.3.)
To protect fixture traps from siphoning, the developed length of a trap arm must be at least twice the NPS (Nominal Pipe Size) of the fixture drain. This technical detail is a cornerstone of a healthy, odor-free plumbing system in any modern Ontario home or business.
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.