2024 Ontario Building Code 3.2.2.93: Guide to Encapsulated Mass Timber Construction in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc., I see Article 3.2.2.93 as a pivotal shift for mid-rise developments in London and Oakville, allowing us to utilize sustainable mass timber for buildings up to 18 storeys. The specific allowances for Group A and F occupancies on lower levels provide essential design flexibility for the mixed-use urban intensification projects currently trending in Southwestern Ontario and the Muskoka region."
Understanding Article 3.2.2.93: Encapsulated Mass Timber Construction (EMTC)
The 2024 Building Code Compendium introduces significant standards for Encapsulated Mass Timber Construction (EMTC). Article 3.2.2.93 outlines the permissible heights, areas, and fire safety requirements for various major occupancies, ranging from residential (Group C) to industrial (Group F). For developers working with empcontracting.ca Inc. your construction contractor in London, Ontario, these regulations provide a roadmap for sustainable, high-density timber builds.
Occupancy Flexibility for Group A and Group F
According to Sentences (6) and (7), the code allows for specific flexibility regarding mixed-use builds:
- Group A, Division 2: Assembly occupancies located below the fourth storey can be constructed following the requirements for Group C or D occupancies.
- Group F, Division 2 and 3: Industrial occupancies located below the third storey may follow Group D occupancy requirements.
This allows for more streamlined structural designs in multi-purpose buildings without compromising the safety standards of the 2024 OBC.
Table 3.2.2.93: Height and Encapsulation Ratings
The table provides strict limits on building height and area based on the required encapsulation rating (measured in minutes). For instance, Group C (Residential) and Group D (Business) buildings can reach up to 18 storeys (76m) provided they maintain a 70-minute minimum encapsulation rating. Conversely, smaller 6-storey structures may require no specific encapsulation rating (0 min) depending on the building area and specific occupancy type.
Compliance and Sprinkler Requirements
All buildings within the scope of Article 3.2.2.93 must be sprinklered. This ensures that the innovative use of mass timber is supported by active fire suppression systems, making it a viable alternative to traditional concrete and steel for mid-to-high-rise projects across Ontario.
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.