NBC 2025 Guide: Floor Finish and Decorative Material Standards for London, Ontario
Sarah's Expert Insight
Senior Consultant at empcontracting.ca Inc.
"In London, Ontario, we are seeing a trend toward natural wood finishes in commercial renovations; however, many overlook the 2025 NBC's stricter smoke-development limits for these materials in public spaces. As a consultant at empcontracting.ca Inc. your construction contractor in London, Ontario, I emphasize that early material testing and selection are critical to avoiding the costly 'rip-and-replace' scenarios that occur when decorative finishes fail to meet flame-spread compliance during final inspections."
Compliance with NBC 2025: Floor Finishes and Decorative Materials
In the 2025 National Building Code (NBC), the regulation of floor finishes and decorative materials is primarily concerned with fire safety, specifically focusing on flame-spread ratings and smoke development classifications. For projects managed by empcontracting.ca Inc. your construction contractor in London, Ontario, adhering to these standards is essential for passing inspections and ensuring occupant safety.
Flame-Spread Rating (FSR) and Smoke Developed Classification (SDC)
The NBC 2025 mandates that floor finishes, including carpets and resilient flooring, must meet specific Flame-Spread Ratings under the CAN/ULC-S102.2 standard. In high-occupancy buildings or assembly areas, the requirements are more stringent to prevent rapid fire growth. Decorative materials such as wood paneling or fabric wall coverings are also subject to maximum FSR limits, typically restricted to a rating of 150 or lower in most residential applications, and as low as 25 in critical egress routes.
Requirements for Exits and Public Corridors
Public corridors and exit stairs are the most strictly regulated areas. Under the updated 2025 code, decorative materials in these zones must often be non-combustible or possess a very low smoke-developed index. This ensures that in the event of a fire, visibility remains high for evacuees. Our team at empcontracting.ca Inc. your construction contractor in London, Ontario specializes in selecting materials that balance luxury aesthetics with these life-safety requirements.
Combustible vs. Non-Combustible Construction
The type of building construction (Combustible vs. Non-Combustible) dictates the volume and type of decorative finishes allowed. NBC 2025 provides updated tables for the allowable percentage of combustible wall and ceiling finishes. For London homeowners opting for modern timber accents, these calculations are vital to remain within the safety margin prescribed by Ontario's building authorities.