Air Tightness Testing

Air Tightness Testing

One Stop Consult will provide you with a site readiness checklist to help you determine when your building is ready. Our technicians calculate air tightness via the following process:

We’ll install a large fan, usually in a doorway.

Next, we will temporarily seal openings to the property and switch the fan on.

The air pressure is gradually increased and decreased, recording the pressure differential at each step.

Finally, our technicians will calculate the total air flow required to achieve a pressure differential of 50 Pa, divided by the total building envelope area.

This calculation will show leakage rate in m³/h.m² @ 50 Pa.

Whilst we’re conducting your test, other contractors can continue work within the property. However, all windows and doors must remain closed for the duration of the test.

If the air test fails, we do offer a sealing and guaranteed pass service. This is a good solution for handover deadlines. The price for this service is determined depending on the leakage report and size scheme.

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