OBC 3.2.2.26 Standards: Group A Division 2 Construction in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"Choosing between Section 3.2.2.25 and 3.2.2.26 often comes down to a cost-benefit analysis of installing a sprinkler system versus the value of additional square footage, which is particularly vital for growing commercial hubs in London and Oakville. At empcontracting.ca Inc., your construction contractor in London, Ontario, we prioritize these classifications early in the design phase to ensure your assembly space achieves maximum capacity without compromising on stringent 2024 OBC fire-safety requirements."
Understanding the 2024 Ontario Building Code (OBC) is essential for any commercial assembly project. Sections 3.2.2.25 and 3.2.2.26 outline the specific requirements for Group A, Division 2 buildings up to two storeys. Whether you are planning a restaurant, a community hall, or a licensed club, empcontracting.ca Inc. your construction contractor in London, Ontario, ensures your project meets these critical safety and compliance standards.
OBC 3.2.2.25: Standard Building Area and Fire Ratings
For buildings not exceeding two storeys, Section 3.2.2.25 dictates the maximum building area based on the number of streets the property faces. These structures allow for combustible or noncombustible construction, provided specific fire-resistance ratings are met.
Maximum Building Area Table (Non-Sprinklered)
- 1 Storey: Ranges from 1,600 m² (1 street) to 2,400 m² (3 streets).
- 2 Storeys: Ranges from 800 m² (1 street) to 1,200 m² (3 streets).
Fire-Resistance Requirements
Under this section, floor assemblies and mezzanines must maintain a fire-resistance rating of at least 45 minutes. If the building is only one storey, the fire-resistance rating for the roof may be waived if the assembly uses fire-retardant-treated wood and the building area remains within specific thresholds (e.g., 800 m² for one street).
OBC 3.2.2.26: Increased Area for Sprinklered Buildings
When a Group A, Division 2 building is sprinklered throughout, the OBC allows for a significant increase in the allowable building area. This is a common strategy used by empcontracting.ca Inc. your construction contractor in London, Ontario, to maximize the utility of a commercial lot.
Allowable Areas for Sprinklered Assemblies
- 1 Storey: Up to 4,800 m².
- 2 Storeys: Up to 2,400 m².
While the area increases, the building must still adhere to strict fire separation regulations. All loadbearing walls, columns, and arches supporting an assembly must maintain a fire-resistance rating of at least 45 minutes or be of noncombustible construction.
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.