Understanding Ontario Building Code for Group F Division 3 Industrial Buildings | empcontracting.ca Inc.

When planning industrial developments in Ontario, understanding the specific requirements for Group F, Division 3 (Low-Hazard Industrial) occupancies is essential. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in navigating these complex 2024 Ontario Building Code (OBC) regulations to ensure your project is both compliant and cost-effective.

Combustible and Noncombustible Construction Limits (OBC 3.2.2.81)

For smaller industrial buildings, the code permits a mix of combustible and noncombustible construction. However, strict area limits apply:

• 1 Storey: Building area must not exceed 4,500 m².
• 2 Storeys: Building area must not exceed 1,800 m².

In these structures, floor assemblies and loadbearing elements must maintain a fire-resistance rating of at least 45 minutes to ensure structural integrity during an emergency.

Large Scale Industrial: Unlimited Height and Area (OBC 3.2.2.82)

For major industrial facilities that exceed standard size limits, Section 3.2.2.82 mandates noncombustible construction and comprehensive sprinkler systems. Key requirements include:

Fire Separation and Ratings

• Floor Assemblies: Must act as fire separations with a minimum 2-hour fire-resistance rating (reduced to 1 hour for open-air storage garages).
• Mezzanines: Must have at least a 1-hour fire-resistance rating.
• Loadbearing Elements: Must match the fire-resistance rating of the assemblies they support.

Mid-Rise Industrial Standards: Up to 6 Storeys (OBC 3.2.2.83)

Section 3.2.2.83 provides a sliding scale for building areas based on the number of storeys and the building's proximity to public streets. Increasing street access (facing 1, 2, or 3 streets) allows for significantly larger allowable building areas. For example, a 2-storey industrial building facing three streets can expand up to 10,800 m², whereas facing only one street limits it to 7,200 m².

Expert guidance from empcontracting.ca Inc. your construction contractor in London, Ontario ensures that your site plan and architectural design leverage these street-facing benefits to maximize your usable industrial space.