Canadian building code question

What are the building code requirements for insulated concrete form (ICF) construction in Canada?

ICF construction must meet the structural design requirements for reinforced concrete walls, satisfy fire-resistance rating requirements based on the concrete core thickness, and comply with energy code provisions for the integrated insulation. ICF systems evaluated to CAN/ULC or CCMC standards provide a recognized compliance path.

Insulated concrete forms combine formwork, insulation, and structure in a single system. The building code regulates the concrete core as a reinforced concrete wall and the foam forms as insulation and interior/exterior finish components. Fire-resistance ratings depend on the concrete thickness, and energy performance depends on the insulation value of the forms. Most ICF systems carry CCMC evaluations that simplify the code compliance path.

What to check first

  • Confirm the structural design of the ICF wall meets CSA A23.3 requirements for reinforced concrete, including the concrete core thickness and reinforcing layout.
  • Verify the fire-resistance rating of the ICF assembly based on the concrete core thickness and the applicable ULC or CCMC evaluation.
  • Check that the ICF insulation values meet the energy code requirements for the climate zone and wall assembly.

Jurisdiction notes

National baseline

The NBC treats ICF walls as reinforced concrete walls. The structural design follows CSA A23.3, and fire-resistance ratings are based on concrete thickness per NBC tables or tested assemblies.

CCMC evaluations

Most ICF systems in Canada carry CCMC (Canadian Construction Materials Centre) evaluations that confirm code compliance for structural, fire, and thermal performance.

Energy code

ICF systems provide continuous insulation that typically meets or exceeds energy code requirements. Verify the effective R-value including thermal bridging for the applicable energy code path.

Work through it in this order

  1. Select an ICF system with a current CCMC evaluation or equivalent technical documentation.
  2. Design the reinforced concrete core to meet CSA A23.3 structural requirements for the building loads and conditions.
  3. Confirm the fire-resistance rating of the ICF assembly meets the code requirements for the building classification.
  4. Verify the thermal performance of the ICF wall meets the energy code requirements for the climate zone.

Common questions

Do ICF walls need additional fireproofing?

Generally no. The concrete core provides fire resistance. The fire-resistance rating depends on the concrete thickness and can be confirmed through NBC tables, ULC testing, or the CCMC evaluation for the specific ICF system.

Can ICF be used for multi-storey buildings?

Yes. ICF construction is used in residential and commercial buildings up to the height and area limits for the applicable construction type. The structural design must account for the full building loads.

Is ICF construction considered combustible or noncombustible?

The concrete core is noncombustible. The foam formwork is combustible but protected by the required interior and exterior finishes. The building code classification depends on the overall wall assembly and building type.