Expert Guide to 2024 Ontario Building Code: Plumbing Venting and Oil Interceptors
Sarah's Expert Insight
OBC Compliance Specialist
"The 2024 OBC requirements for oil interceptor venting are particularly strict regarding frost closure and termination heights. In areas like Muskoka and London where winter temperatures drop significantly, ensuring the exterior vent is at least NPS 3 is a non-negotiable step that empcontracting.ca Inc. your construction contractor in London, Ontario, implements to prevent system failures and maintain safety standards in commercial and industrial projects."
Navigating the complexities of the 2024 Ontario Building Code (OBC) is essential for any successful plumbing installation. As empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize precision in venting systems to ensure long-term safety and performance.
Section 7.5.4: Offset Relief and Fixture Venting
7.5.4.4. Offset Relief Vents
According to the OBC, a stack with a nominally horizontal offset exceeding 1.5 m—where the upper vertical portion passes through more than two storeys and carries a hydraulic load over 100 fixture units—must be properly vented. This requires offset relief vents connected both immediately above the offset and at the lower vertical section to manage pressure fluctuations effectively.
7.5.4.5. Fixtures Draining into Vent Pipes
The code permits trap arms for fixtures with a hydraulic load of 1.5 units or less to connect to vertical vent sections (like circuit or yoke vents). However, this is limited to two fixtures using a double sanitary T fitting, provided the wet vent section is at least NPS 2.
Section 7.5.5: Miscellaneous Venting Protocols
7.5.5.1. Venting of Sanitary Sewage Sumps
Every sump or tank receiving sanitary sewage requires a dedicated vent pipe connected to the top. Proper sizing is critical to ensure the pump system functions without creating vacuum issues or allowing sewer gases to escape into the structure.
7.5.5.2. Specialized Venting for Oil Interceptors
Oil interceptors require a dual-venting strategy to facilitate airflow and prevent gas accumulation:
- Two independent vent pipes extending to the open air.
- Terminations must be at least 2 m above ground with a minimum 300 mm elevation difference between them.
- In cold climates, vents located outside must be at least NPS 3 to prevent frost closure, a common concern for our projects in Muskoka and London.
For expert management of these technical requirements, trust empcontracting.ca Inc. your construction contractor in London, Ontario to deliver code-compliant results.
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.