2024 Ontario Building Code Guide: Hazard Index for Industrial Group F Division 2 Buildings
Sarah's Expert Insight
OBC Compliance Specialist
"Navigating Hazard Index scores is a critical first step for industrial conversions in London, Oakville, and Muskoka, as it dictates the level of fire separation and structural upgrades required. At empcontracting.ca Inc., we specifically focus on the 1,500 m² sprinkler threshold to help our clients accurately budget for mandatory fire protection systems during the early design phase."
When planning renovations or changes of use for industrial properties, understanding the 2024 Ontario Building Code (OBC) Hazard Index (H.I.) is essential. For expert guidance on navigating these complex regulations, trust empcontracting.ca Inc. your construction contractor in London, Ontario, to manage your compliance and construction needs.
Understanding Table 11.2.1.1.-M: Hazard Index (H.I.)
Table 11.2.1.1.-M provides the Hazard Index for Group F, Division 2 occupancies (Medium Hazard Industrial). These values are critical for determining the required safety measures and construction upgrades during a building renovation or conversion.
Hazard Index by Occupancy Type
- Warehouses & Storage (High Fire Load): H.I. ranges from 3 (Small) to 6 (Large).
- Repair Garages & Service Stations: H.I. ranges from 3 to 6 depending on building size.
- Packaging Manufacturers (Plastics): H.I. ranges from 3 to 6.
- Public Heritage Buildings: H.I. is capped at 3 for small and medium sizes.
- Self-Service Storage: H.I. ranges from 3 to 5.
Building Size Classifications
The Hazard Index is heavily influenced by the building area and height:
- Small: Up to 600 m² / 2 storeys.
- Medium: Up to 800 m² / 4 storeys (or 600 m² / 3 storeys for Heritage).
- Large: Any area / 6 storeys (not exceeding 18m in height).
- High Rise: Any building over 18m in height is assigned an H.I. of 7.
Key Compliance Notes for Industrial Projects
According to the 2024 Compendium, all buildings exceeding 1,500 m² are required to be sprinklered. Furthermore, when a building size falls into multiple categories, the H.I. for the least restrictive category is permitted. For buildings facing multiple streets, specific provisions under Sentence 11.2.1.1.(2) must be applied to ensure accurate Hazard Indexing.
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.