Concrete Airtightness Test Results — Stackcell Structure System
Air Tightness Test
An air tightness test (or blower door test) measures unintentional air leakage through a building's envelope. By pressurizing or depressurizing a structure with calibrated fans. This test identifies drafts, gaps in the house fabric and ensures compliance with energy codes (like Passive House), and improves indoor air quality
- Date Completed: 30/05/2026
- Developer: Miles Construction - 2 storey walkup
- Average Results:
- Permeability: qE50 (m3/h): 1.5
- Airtightness: n50 (1/h): 2.00
Why air tightness matters!
Air tightness is one of the most misunderstood aspects of residential construction in New Zealand. Many people assume a house "needs to breathe", when in reality people need fresh air, not uncontrolled air leakage through the building envelope.
A warm, healthy home is achieved
through a combination of:
- Airtightness
- Insulation
- Thermal mass
- Ventilation
- Moisture management
- Solar Design
- Quality Glazing
Air leakage is one of the largest causes of heat loss in New Zealand homes
So Why is Concrete good when it comes to this stuff?
Because Concrete is Naturally airtight!
Concrete Provides
- Very low air permeability
- Fewer leakage pathways
- High Durability
- Excellent Thermal Mass
Rather than thousands of timber-frame leakage paths.
A well-designed concrete home can achieve:
Below 1 ACH50 relatively easily compared with timber construction
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