2025 National Building Code: Protection of Vertical Shafts Guide for London, Ontario Construction
Sarah's Expert Insight
Senior Consultant at empcontracting.ca Inc.
"In my years consulting on London, Ontario job sites, I've seen that vertical shaft compliance is where many builders face inspection delays. At empcontracting.ca Inc. your construction contractor in London, Ontario, we emphasize that protecting these shafts isn't just about passing code; it is about creating a predictable path for smoke management that saves lives during an emergency."
The Importance of Vertical Shaft Protection in NBC 2025
In modern architecture, vertical shafts—including elevator hoistways, stairwells, and service chases—represent a significant risk for the vertical spread of fire and smoke. The National Building Code (NBC) 2025 mandates stringent protection measures to ensure that these vertical openings do not act as chimneys during a fire event. As empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in implementing these complex safety standards to protect both occupants and property integrity.
Fire-Resistance Ratings (FRR) for Shaft Enclosures
Under the 2025 code, every vertical shaft must be enclosed in a fire separation. The fire-resistance rating of this enclosure is determined by the type of occupancy and the required FRR of the floor assemblies it penetrates. For instance, if a building requires a 2-hour fire-rated floor assembly, the vertical shaft must typically maintain that same 2-hour integrity to prevent fire from bypassing horizontal barriers.
Opening Protectives and Smoke Control
The integrity of a vertical shaft is only as strong as its weakest point. NBC 2025 requires all openings into a shaft, such as access doors or HVAC duct penetrations, to be equipped with certified fire doors or fire dampers. These protectives must be self-closing and possess a fire-protection rating compatible with the shaft enclosure. Furthermore, the 2025 updates place a renewed focus on smoke-tightness to ensure that toxic gases do not migrate through service gaps into exit stairs.
Structural Continuity and Service Penetrations
Properly sealing penetrations—where pipes, wires, or ducts enter the shaft—is a critical compliance factor. Using approved fire-stopping systems is mandatory. At empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure that every penetration is treated with ULC-listed firestop materials that match the specific hourly rating of the vertical assembly.