Blower-door airtightness testing

Use blower-door testing to measure airtightness, prioritize leakage and compare before/after without compromising combustion appliances.

VERT / GREEN

Document visible leakage paths and prepare access before a professional evaluation.

JAUNE / YELLOW

The result must be interpreted with volume, ventilation, leakage locations and mechanical systems, not just as a number to beat.

ROUGE / RED

Operating fuel-fired appliance, ashes in a wood appliance or incomplete envelope: do not improvise depressurization testing.

Interactive triage

Pre-retrofit measurement available
Keep the value/method as baseline. No post-sealing ventilation plan
Link airtightness goal and ventilation before further sealing. Combustion appliances present
Follow the evaluator safety protocol; the test can affect their operation. Targeted leakage investigation
Use smoke/thermal imaging only with appropriate method and conditions.

Useful tools and data

Blower-door report
Leakage map
Ventilation/combustion history

What the professional checks

Measure flow and pressure
Locate dominant leaks
Check mechanical interactions

Official sources

Checked 2026-08-22.

RNCan — évaluations EnerGuide

Explore: Systems to check before closing the work

Systems to check before closing the work

This section connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesLoad-bearing walls and openingsCode versions

Explore: Building interfaces to diagnose before enclosure or replacement

Building interfaces to diagnose before enclosure or replacement

These tools connect structure, water, air, frost, wind and mechanical systems so repairs do not hide the cause.

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