2024 Ontario Building Code: Group A Division 3 Assembly Building Requirements
Sarah's Expert Insight
OBC Compliance Specialist
"Balancing fire-resistance ratings with building area is a critical pivot point for project budgets in London and Oakville. At empcontracting.ca Inc. your construction contractor in London, Ontario, we often recommend leveraging the sprinklered allowances of 3.2.2.31 to double your allowable floor area while ensuring long-term safety and compliance for high-occupancy assembly venues."
Navigating the complexities of the 2024 Building Code Compendium is essential for successful large-scale developments. Whether you are planning a community center or an arena, empcontracting.ca Inc. your construction contractor in London, Ontario, ensures your project meets the rigorous fire safety and structural standards of the OBC.
Section 3.2.2.31: Sprinklered Assembly Buildings
Under Article 3.2.2.31, buildings classified as Group A, Division 3 that are sprinklered throughout can reach heights of up to 2 storeys. For a 1-storey building, the maximum area is 12,000 m², while 2-storey buildings are capped at 6,000 m². These structures must typically be of noncombustible construction, with floor assemblies and mezzanines requiring a fire-resistance rating of at least 1 hour.
Section 3.2.2.32: One Storey Increased Area Options
Article 3.2.2.32 provides flexibility for single-storey assembly buildings. Depending on street access, building areas are permitted up to 3,600 m² (if facing 3 streets). A key advantage here is the allowance for either combustible or noncombustible construction, offering cost-effective solutions for builders in regions like Oakville and Muskoka.
Fire-Resistance and Material Standards
Compliance with the 2024 OBC requires specific fire-resistance ratings for structural components. For non-sprinklered or increased area buildings, loadbearing walls and columns must match the rating of the assembly they support. However, heavy timber construction remains a permitted alternative for roof arches and certain structural members, providing both durability and aesthetic appeal for Ontario assembly halls.
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.