2024 Ontario Building Code Guide: Hazard Index for Group A Division 1 Occupancies
Sarah's Expert Insight
OBC Compliance Specialist
"When converting older structures into performance spaces in London or Muskoka, the transition from 'Medium' to 'Large' classification can significantly impact your fire safety requirements. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in navigating these H.I. ratings to ensure your theatre or studio project remains compliant with the 2024 OBC while optimizing your renovation budget."
Navigating the 2024 Building Code Compendium is essential for successful commercial renovations and occupancy changes. Table 11.2.1.1.-B outlines the Hazard Index (H.I.) for Group A, Division 1 occupancies, which primarily includes performance-based venues such as dinner theatres, live theatres, and television studios.
Understanding Hazard Index Ratings (H.I.)
The Hazard Index is a numerical value used to determine the level of risk associated with a building's occupancy. For Group A Division 1, the ratings are categorized by building size:
- Small: H.I. 4 (Up to 300 occupants, 1 storey)
- Medium: H.I. 5 (600 m², up to 600 occupants, 1 storey with limited 2nd-storey area)
- Large: H.I. 6 (Up to 18m in height)
- High-Rise: H.I. 7 (Exceeding 18m in height)
Specific Occupancy Types Covered
The following venues are strictly governed by these classifications under the Ontario Building Code (OBC):
- Dinner Theatres and Live Performance Venues
- Motion Picture Theatres
- Opera Houses
- Television Studios with Live Audiences
Compliance and Planning with empcontracting.ca Inc.
Determining your building's Hazard Index is the first step in any major occupancy change. If you are looking to renovate an existing structure, empcontracting.ca Inc. your construction contractor in London, Ontario, provides the technical expertise to ensure your project meets all Part 11 requirements for building size and height limitations.
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.