2024 Ontario Building Code Guide: Piping Support and Protection Standards
Sarah's Expert Insight
OBC Compliance Specialist
"Adhering to strict thrust restraint and backfilling protocols is critical for the varied soil compositions in London, Oakville, and Muskoka, where shifting clay or rocky terrain can easily compromise underground services. At empcontracting.ca Inc., your construction contractor in London, Ontario, we ensure that every underground installation exceeds these protection standards to prevent the costly long-term repairs often caused by improper soil tamping or inadequate pipe support."
Navigating the complexities of the 2024 Building Code Compendium is essential for ensuring the longevity and safety of plumbing infrastructure. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in implementing these technical requirements to guarantee project success and compliance.
7.3.4.6. Support for Underground Horizontal Piping
Proper support is the foundation of a reliable plumbing system. According to OBC 7.3.4.6, underground horizontal piping must rest on a firm and continuous base. If a base is not feasible, specialized hangers fixed to foundations or structural slabs must be used, provided they can support the weight of the pipe, its contents, and the surrounding fill.
7.3.4.9. Thrust Restraint of Water Service Pipes
For water service pipes NPS 4 or larger, mechanical stability is non-negotiable. Thrust restraints, such as concrete thrust blocks with a minimum compressive strength of 10 MPa, must be provided at all changes in direction, including tees and bends. These ensure the system remains intact under surge pressures and high-flow conditions.
7.3.5. Protection of Piping and Backfill Requirements
Section 7.3.5 highlights the importance of protecting pipes from physical damage. When backfilling, the material must be carefully tamped to at least 300 mm above the pipe. Crucially, this backfill must be free of large stones, boulders, or frozen earth that could cause puncture or misalignment.
7.3.5.1A. Specialized Protection for Non-Metallic Pipe
When working with vitrified clay located less than 600 mm beneath a basement floor, the code requires additional shielding. Unless the floor itself is at least 75 mm of concrete, a dedicated 75 mm concrete layer must be installed above the pipe to prevent structural failure or crushing.
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.