Building airtightness test: energy audit and heat-loss detection

A building airtightness test reveals hidden heat loss: during an energy audit, specialists determine the dew point, the air change rate and the points of leakage.

The survey shows where heat escapes and cold air enters through the building envelope. The client receives a report with a quantified estimate of energy losses and a list of problem areas.

What the video shows

• Determining the building's dew point


• Measuring the air change rate


• Locating leaks with smoke


• Measuring direct heat loss through materials


• Detecting temperature differences — up to 12 °C at weak points


• Compiling a report with energy losses in figures

Such an audit helps plan insulation and window replacement before construction is finished, when fixing shortcomings is easier and cheaper.