Air Tightness Testing

Air Tightness Testing

Measure the draughts

Uncontrolled air leakage can account for a large share of the heat lost from an older home, and it is invisible until you measure it. An air tightness test uses a calibrated fan fitted in a doorway to put the house under a small pressure difference and measure the airflow needed to maintain it. While the fan runs, smoke or a thermal camera shows exactly where the air is getting in.

When you need a test

• Before a retrofit, to establish a baseline and target the draught-proofing that will have the greatest effect
• After insulation or draught-proofing work, to prove the improvement
• Before installing a heat pump or MVHR system, where air leakage affects sizing and performance
• For extensions and new dwellings where Building Regulations Part L requires a test result
• To investigate rooms that never feel warm whatever the thermostat says

What you receive

A test certificate giving the air permeability result, a photographic record of the leakage paths found, and a prioritised list of sealing work. Testing can be combined with a retrofit assessment or ventilation survey.

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