Expert Guide to NBC 2025: Fire Separation Penetrations for London, Ontario Construction
Sarah's Expert Insight
Senior Consultant at empcontracting.ca Inc.
"In London, Ontario, firestop compliance is one of the most scrutinized aspects of the building inspection process. At empcontracting.ca Inc. your construction contractor in London, Ontario, we emphasize that the 2025 code updates demand higher precision in material selection to ensure life safety and avoid the high costs of retrofitting improperly sealed penetrations."
Understanding Fire Separation Penetrations under NBC 2025
Page 361 of the National Building Code (NBC) 2025 outlines critical requirements for maintaining the integrity of fire-resistance ratings where assemblies are breached. These regulations ensure that service penetrations—such as plumbing, electrical wiring, and HVAC ductwork—do not become conduits for smoke or flame spread during a fire event.
The Role of Firestop Systems
When a fire separation is penetrated by a service, the NBC 2025 requires that the opening be sealed with a firestop system. These systems must be tested in accordance with CAN/ULC-S115, 'Standard Method of Fire Tests of Firestop Systems.' This ensures the fire-resistance rating of the assembly remains intact, providing vital protection for occupants in multi-unit or commercial buildings.
Combustible vs. Non-combustible Penetrants
The code distinguishes strictly between the types of materials passing through a fire separation. Non-combustible penetrations, such as copper piping or steel conduit, have different sealing requirements compared to combustible materials like PVC or ABS piping. Combustible penetrants often require specialized intumescent firestops that expand when exposed to heat, effectively crushing the pipe and sealing the hole as the material melts.
Compliance Standards for London Builders
For projects in Southwestern Ontario, compliance is not just about safety—it is about passing rigorous municipal inspections. At empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every penetration is documented and sealed according to the specific ULC design specified in the architectural plans. This level of detail is necessary to meet the 2025 standards and ensure the longevity and safety of your investment.
Key Considerations for Installation
- Annular Space: The gap between the penetrant and the edge of the opening must be precisely managed to ensure the firestop material performs as tested.
- Support Systems: Proper bracing of pipes and ducts is required to prevent movement that could compromise the firestop seal during a thermal event.
- Documentation: Maintaining a log of firestop systems used is a best practice for modern commercial builds in London.