NBC 2025 Guide: Combustible and Noncombustible Construction in London, Ontario
Sarah's Expert Insight
Senior Consultant at empcontracting.ca Inc.
"The NBC 2025 requirements for combustible versus noncombustible construction significantly impact project budgeting and insurance risk profiles in London. By partnering with empcontracting.ca Inc., builders and homeowners can strategically select materials like mass timber to balance environmental goals with the stringent fire-safety compliance necessary for modern Ontario building permits."
Understanding the distinctions between combustible and noncombustible construction under the National Building Code (NBC) 2025 Division B is essential for ensuring life safety and structural durability. As empcontracting.ca Inc. your construction contractor in London, Ontario, we provide the technical expertise needed to navigate these complex regulations during the design and build phases.
Overview of NBC 2025 Construction Classifications
Division B of the NBC 2025 categorizes buildings based on their intended use, height, and area, which dictates whether the structure must be of noncombustible construction or if combustible materials are permitted. These regulations are designed to limit the probability of fire spread and structural collapse.
Noncombustible Construction Standards
Noncombustible construction is generally required for high-rise buildings, assembly occupancies, and care facilities. These structures must be built with materials that do not ignite or support combustion when tested in accordance with CAN/ULC-S114. Common materials include steel, concrete, and masonry. The 2025 updates continue to refine fire-resistance ratings for floor assemblies and load-bearing walls to enhance occupant egress times.
Combustible Construction and Mass Timber
Combustible construction is traditionally used in residential and small commercial projects (Part 9 buildings). However, the NBC 2025 further expands the use of Encapsulated Mass Timber Construction (EMTC). This allows for taller combustible buildings—up to 12 storeys in some cases—provided specific fire-protection measures and encapsulation ratings are met. This innovation offers a sustainable alternative for developers in London, Ontario, looking for modern aesthetic finishes without compromising safety.
Implementation for London, Ontario Projects
Local zoning and Ontario-specific amendments often interact with the National Building Code. When planning your project, empcontracting.ca Inc. your construction contractor in London, Ontario, ensures that all material selections, from cladding to structural framing, comply with the latest fire-performance requirements of the NBC 2025 to streamline the building permit process.