Canadian building code question

What are the building code requirements for building envelope commissioning and air leakage testing in Canada?

Building envelope commissioning and air leakage testing requirements depend on the energy code compliance path, building type, provincial step code tier, and whether the project uses a performance or prescriptive approach.

Envelope commissioning verifies that the building enclosure performs as designed, while air leakage testing confirms that the air barrier system meets specified tightness targets. These requirements have expanded significantly as energy codes tighten and provinces adopt step codes. The specific testing and commissioning obligations depend on the compliance path chosen, the building's size and type, and the provincial jurisdiction.

What to check first

  • Air leakage testing may be required to demonstrate compliance with energy code air tightness targets.
  • Envelope commissioning requirements increase at higher energy step code tiers.
  • Performance-based energy compliance paths often require testing to validate modeled assumptions.

Jurisdiction notes

National baseline

The NECB and NBC Part 9 energy provisions include air barrier requirements, with testing as one compliance pathway.

Provincial step codes

Higher step code tiers in BC and other provinces typically require air leakage testing to demonstrate compliance.

Project variables

Building size, compliance path chosen, step code tier, and whether the project pursues voluntary certification all affect testing requirements.

Work through it in this order

  1. Determine the applicable energy code and step code tier for the project.
  2. Identify whether air leakage testing is mandatory or optional under the compliance path.
  3. Specify commissioning and testing scope in the project specifications.
  4. Confirm testing standards and acceptable air leakage rates for the applicable code.

Common questions

Is air leakage testing mandatory for all buildings?

Not for all buildings — the requirement depends on the energy code compliance path, building type, and provincial step code tier.

What standard is used for air leakage testing?

ASTM and CAN/ULC standards provide test methods for whole-building and component air leakage testing — the applicable standard depends on the code reference.

What happens if a building fails the air leakage test?

Remediation of air barrier deficiencies and retesting is typically required to demonstrate compliance before occupancy.