OBC 2024 Fire-Resistance Standards: A Guide by empcontracting.ca Inc. your construction contractor in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"In high-growth areas like London and Oakville, the 45-minute fire-resistance rating is a critical baseline for multi-unit residential projects. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize the correct application of SB-2 and SB-3 standards to ensure that duct penetrations and steel protection never compromise the safety of our clients' investments."
Navigating the 2024 Building Code Compendium is essential for safe and compliant builds in Ontario. As experts at empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every detail of fire safety—from membrane ceilings to structural steel—meets or exceeds provincial standards.
9.10.5.1. Membrane Ceilings and Duct Protection
Membrane ceilings used for fire-resistance ratings, particularly those based on the MMAH Supplementary Standard SB-3, have strict requirements for openings. Any duct piercings must conform to the fire performance ratings outlined in MMAH Supplementary Standard SB-2 to maintain the integrity of the fire separation.
9.10.6. Construction Types and Materials
Combustible Elements in Noncombustible Construction
Where a building is designated as noncombustible, any combustible elements must be strictly limited according to Subsection 3.1.5. This ensures that the structural integrity is not compromised during a fire event.
Heavy Timber Construction
Under Article 9.10.6.2., heavy timber construction is recognized as having a 45-minute fire-resistance rating, provided it is constructed in accordance with Article 3.1.4.7. This is a popular choice for aesthetic and functional designs in regions like Muskoka.
9.10.7. Protection of Structural Steel
Structural steel members are vulnerable to high heat. Except where specific exemptions apply, these members must be protected to provide the required fire-resistance rating to prevent premature structural failure during an emergency.
9.10.8. Fire-Resistance Ratings for Floors and Roofs
The OBC specifies minimum fire-resistance ratings based on occupancy and building height. For Group C (Residential) buildings up to 3 storeys, floors and mezzanines generally require a 45-minute fire-resistance rating. For other occupancies, roofs may also require a 45-minute rating depending on the height of the structure.
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.