OBC 2024 Drainage and Venting System Testing: A Guide by empcontracting.ca Inc. in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"Adhering to OBC 7.3.6 is more than just a regulatory hurdle; it is a quality assurance benchmark that prevents catastrophic failures in the high-demand environments of London and Oakville. At empcontracting.ca Inc., we find that performing the air pressure test at 35 kPa early in the rough-in stage is the most effective way to safeguard Muskoka cottage builds against winter pipe stress."
When managing residential or commercial builds, compliance with the 2024 Building Code Compendium Section 7.3.6 is critical for ensuring the integrity of plumbing systems. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these standards to ensure every project meets provincial safety and performance benchmarks.
Mandatory Testing for Drainage and Venting Systems
The Ontario Building Code (OBC) requires that after a drainage or venting system is roughed in—and before any fixtures are installed or piping is covered—a water or air test must be performed. This ensures the system is leak-proof and structurally sound.
Primary Testing Methods and Specifications
- Water Pressure Tests (7.3.6.4): This involves applying a water column of at least 3 meters to all joints. The system must remain filled for at least 15 minutes without any drop in water levels.
- Air Pressure Tests (7.3.6.5): Air is forced into the system until a gauge pressure of 35 kPa is reached. This pressure must be maintained for 15 minutes with zero leakage.
- Ball Tests (7.3.6.1.5): Essential for buried underground drains and sewers, a ball test must be conducted to ensure there are no internal obstructions or structural deformities.
Inspections and Prefabricated Systems
If your project utilizes prefabricated plumbing assemblies, the OBC requires that these be tested and inspected off-site if they cannot be adequately verified once installed. Furthermore, final inspections by the chief building official may be requested after fixtures are installed to ensure the entire system is operational and safe.
Exceptions to Testing
While most systems require rigorous oversight, the code provides an exception for external leaders and certain sewer lateral extensions that were previously tested at the time of the public sewer installation.
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.