National Building Code Standards for Insulation and Partitions in London, Ontario

Understanding National Building Code Section 3.1.5.16

Navigating the complexities of the National Building Code of Canada (NBC) is essential for ensuring the safety and compliance of modern structures. At empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in translating these technical requirements into high-quality building solutions for commercial and residential projects.

Protection of Foamed Plastic Insulation

According to Division B, foamed plastic insulation must be adequately protected from adjacent spaces in a building to minimize fire hazards. Unless located within wall assembly concealed spaces, protection must be provided by:

• Gypsum Board: A minimum of 12.7 mm thick, mechanically fastened and independent of the insulation with taped and filled joints.
• Masonry or Concrete: A minimum thickness of 25 mm.
• Thermal Barriers: Any barrier meeting Class B1 requirements under CAN/ULC-S124 standards.
• Protective Coverings: For thermosetting plastics, a 20-minute rated covering tested via CAN/ULC-S145.

Standards for Noncombustible Buildings over 18 Meters

In buildings exceeding 18 meters in height that are not sprinklered, the code mandates stricter protection for foamed plastic insulation with flame-spread ratings between 25 and 500. Required protections include:

• Type X Gypsum Board: Minimum 15.9 mm thickness conforming to ASTM C1396/C1396M or CAN/CSA-A82.27-M.
• Enhanced Masonry: Non-loadbearing masonry must be at least 50 mm thick, while loadbearing masonry must be 75 mm thick.
• Thermal Barriers: Must meet Classification AH40 under CAN/ULC-S124.

Combustible Elements in Partitions

The National Building Code provides specific allowances for combustible elements within buildings required to be of noncombustible construction. empcontracting.ca Inc. your construction contractor in London, Ontario, ensures these elements are used only where permitted:

Lumber and Wood Framing Allowances

1. Small Compartments: Solid lumber partitions (min 38 mm) and wood framing are permitted in non-sprinklered floor areas not exceeding 600 m², provided they are not fire separations or located in care/detention occupancies.
2. Low-Rise Buildings: Wood framing is permitted in partitions for buildings up to 3 storeys high, excluding exit enclosures or vertical service spaces.
3. Sprinklered Buildings: Solid lumber (min 38 mm) or wood-framed partitions are generally permitted in sprinklered noncombustible buildings, provided they are not in care, treatment, or detention facilities.

By adhering to these rigorous standards, empcontracting.ca Inc. your construction contractor in London, Ontario, delivers peace of mind and structural integrity for every client project.