Ontario Building Code 3.1.13: Interior Finish & Flame-Spread Rating Guide for London Contractors
Sarah's Expert Insight
OBC Compliance Specialist
"Adhering to flame-spread ratings is a critical safety measure, especially for commercial retrofits in Oakville or multi-unit developments in London where egress paths must be strictly protected. As empcontracting.ca Inc. your construction contractor in London, Ontario, we emphasize that selecting the right materials during the design phase prevents costly delays during municipal fire inspections and ensures your project meets the highest safety standards in Ontario."
Navigating the 2024 Ontario Building Code (OBC) is essential for any high-quality renovation or new build. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every interior element meets the latest fire safety standards to protect your property and its occupants.
Overview of OBC 3.1.13: Interior Finishes
Section 3.1.13 of the OBC governs the selection and installation of interior finishes, furnishings, and decorative materials. Compliance with these regulations is mandatory under the Fire Protection and Prevention Act, 1997, ensuring that materials used in construction do not contribute excessively to fire growth.
3.1.13.1. Defining Interior Finish Materials
Interior finishes are not limited to just paint. According to the code, these materials include:
- Interior cladding such as plaster, wood, or tile.
- Surfacing materials like fabric, paint, plastic, veneer, or wallpaper.
- Doors, windows, and decorative trim.
- Lighting elements, diffusers, and lenses.
- Carpet material overlying a floor not intended as the finished surface.
3.1.13.2. Flame-Spread Rating (FSR) Requirements
The Flame-Spread Rating (FSR) measures how quickly a fire can spread across a material's surface. Under OBC 3.1.13.2, the general requirement for wall and ceiling finishes is a maximum rating of 150. However, specific areas require much lower ratings to ensure safety.
Table 3.1.13.2: Flame-Spread Rating Standards
Requirements vary significantly based on the building's occupancy and whether the building is equipped with an automatic sprinkler system:
- Exits and Lobbies: These critical egress points require a strict FSR of 25, regardless of sprinklers.
- Group A & B Occupancies: In non-sprinklered buildings, the maximum rating is restricted to 75, whereas sprinklered buildings allow up to 150.
- Vertical Service Spaces: To prevent the vertical migration of fire, a rating of 25 is required.
For residential projects, doors within a dwelling unit are generally exempt from these specific flame-spread ratings, providing more flexibility for interior design in private homes.
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.