2024 Ontario Building Code: Support Standards for Nominally Horizontal Piping (OBC 7.3.4.5)
Sarah's Expert Insight
OBC Compliance Specialist
"In areas like London and Oakville, thermal expansion in plastic piping can lead to significant noise or joint leaks if spacing exceeds 1.2 meters. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure all hangers are anchored with expansion-type plugs into masonry to prevent the sagging often seen in older Muskoka cottage renovations."
Understanding the requirements for horizontal piping support is vital for any residential or commercial build. According to the 2024 Building Code Compendium, specifically Section 7.3.4.5, horizontal piping must be supported by specific materials and intervals to prevent sagging, joint stress, and system failure. For your next project, trust empcontracting.ca Inc. your construction contractor in London, Ontario to adhere to these rigorous safety standards.
General Hanger and Strap Requirements
The OBC provides strict dimensions for metal straps used to support piping systems. These requirements ensure that the weight of the fluid and the pipe itself do not compromise the structure.
- NPS 2 or Less: Metal straps must be at least 0.6 mm thick and 12 mm wide.
- NPS 4 or Less: Metal straps must be at least 0.8 mm thick and 18 mm wide.
- Masonry Attachment: Hangers attached to concrete or masonry must use metal or expansion-type plugs for a secure, permanent fit.
Maximum Horizontal Spacing Intervals
Plastic and Composite Piping
Plastic pipes have specific support needs due to their flexibility and thermal expansion properties:
- ABS or PVC Plastic: 1.2 meters (Support required at the end of branches and changes in direction).
- PEX Plastic Pipe: 0.8 meters.
- PE-RT Tube: 0.8 meters.
- CPVC or PP-R: 1.0 meter.
Metallic and Heavy-Duty Piping
Rigid materials allow for wider spacing but require precise placement at joints:
- Cast-Iron Pipe: 3.0 meters (Generally at or adjacent to each hub).
- Copper Tube (Hard Temper): 2.5 meters for diameters ≤ NPS 1; 3.0 meters for diameters > NPS 1.
- Galvanized Steel: Up to 3.75 meters for larger diameters (≥ NPS 6).
Special Conditions
For fixture drains or trap arms exceeding 1 meter in length, supports must be placed as close as possible to the trap to ensure proper drainage flow and prevent trap seal loss.
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.