Thermal imaging can be utilized in two ways:
As an opposite of the smoke detection method; using thermal imaging requires the test area to be depressurized, a thermal imaging camera is then used to locate the area where cold outside air is being drawn into the roof. The advantage of thermal imaging is that it shows the pathway the cold air is following and may ensure it is easier to rectify breaks in the air barrier.
Thermal imaging can also be used in conjunction with the smoke method. It can highlight the path of the smoke as it travels through the wall to the outside.
Thermal imaging should be carried out by a trained and qualified person and must conform with BS EN 13187:1999 and BSRIA Technical Note TN 9/2002. These documents identify a number of limitations in relation to thermographic leakage detection.
