NBC Standards for Combustible Components and Factory-Assembled Panels

Understanding the National Building Code of Canada (NBC) is critical for ensuring safety and compliance in modern developments. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in navigating these complex regulations to ensure your noncombustible building projects meet every fire safety requirement.

Combustible Components in Exterior Walls (Section 3.1.5.6)

Section 3.1.5.6 of the NBC outlines the specific conditions under which combustible components may be integrated into exterior wall assemblies for buildings otherwise required to be of noncombustible construction.

Compliance Criteria for Exterior Walls

To use combustible components, a building must meet one of the following criteria:

• The building height must not exceed three storeys.
• The building must be fully sprinklered.

Additionally, the wall assembly must satisfy fire test criteria or be protected by cladding, such as masonry or concrete, with a minimum thickness of 25 mm. At empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure that every assembly complies with Appendix D standards to guarantee structural integrity.

Regulations for Factory-Assembled Panels (Section 3.1.5.7)

Factory-assembled wall and ceiling panels, often containing foamed plastic insulation, are subject to stringent flame-spread ratings. The NBC limits these ratings to 500 or less, depending on the building's use and occupancy.

Standard Panel Requirements

For buildings under 18 meters in height that do not contain Group A, B, or C occupancies, panels are permitted provided they:

• Are used in sprinklered buildings.
• Do not contain internal air spaces.
• Pass the CAN/ULC-S138 standard for fire growth in full-scale room configurations.

Thermosetting Foamed Plastic Insulation

Special provisions apply to panels with thermosetting foamed plastic. These must be encased on both sides by sheet steel at least 0.38 mm thick and must remain in place for at least 10 minutes during a CAN/ULC-S101 fire endurance test. This ensures that the building envelope provides vital protection during the early stages of a fire.

Expert Building Compliance in London, Ontario

Staying compliant with the National Building Code of Canada 2025 ensures the longevity and safety of your commercial or residential property. For expert guidance on noncombustible construction and exterior wall assemblies, contact empcontracting.ca Inc. your construction contractor in London, Ontario today.