Understanding Ontario Building Code 2024: Fire Safety in Combustible Construction
Sarah's Expert Insight
OBC Compliance Specialist
"Navigating the nuances of combustible construction in the Ontario Building Code is vital for residential and mixed-use developments in London, Oakville, and Muskoka. At empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure that every foamed plastic assembly and electrical wiring installation meets the strict FT1 ratings and thermal barrier requirements to maximize safety and ensure a smooth building permit process."
Introduction to Combustible Construction Standards
The 2024 Ontario Building Code (OBC) provides strict guidelines for buildings designed with combustible materials. Under Section 3.1.4.1, while combustible construction is permitted to utilize a mix of combustible and noncombustible components, specific safety measures must be implemented to manage fire risks effectively. When planning your next build, working with empcontracting.ca Inc. your construction contractor in London, Ontario ensures these complex safety layers are handled with professional precision.
Section 3.1.4.2: Protection of Foamed Plastics
Foamed plastics are efficient insulators but represent a fire hazard if not properly protected. The OBC dictates that foamed plastics within wall or ceiling assemblies must be shielded from adjacent spaces. This is typically achieved through:
- Interior finishes such as gypsum board or other approved thermal barriers.
- Sheet metal protection (at least 0.38 mm thick with a high melting point) in buildings without Group A, B, or C occupancies.
- Strict flame-spread ratings, which must not exceed 500 on any exposed surface.
Special Considerations for Walk-in Coolers and Freezers
For commercial applications, walk-in coolers must use factory-assembled panels protected by sheet metal on both sides. These panels must be installed without air spaces and meet specific flame-spread ratings as outlined in Subsection 3.1.12.
Section 3.1.4.3: Regulations for Wires and Cables
Electrical and optical fibre cables with combustible jackets present a risk for flame propagation. To mitigate this, the OBC requires that these components either:
Compliance Methods for Electrical Systems
- Meet the FT1 rating (Vertical Flame Test) in accordance with CSA C22.2 No. 0.3, ensuring they do not convey flame for more than 1 minute.
- Be fully enclosed within noncombustible raceways, masonry walls, or concrete slabs.
Adhering to these electrical standards is non-negotiable for project approval. Partnering with empcontracting.ca Inc. your construction contractor in London, Ontario guarantees that your electrical infrastructure meets all fire safety criteria for combustible builds.
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.