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A thermo graphic infrared scan detects thermal defects such as heat loss and air leakage in building envelopes. During a thermal scan, a specially designed infrared camera is used to take images called thermo grams that will show surface heat variations. The camera measures surface temperatures by capturing light that is in the heat spectrum. Images record the temperature variations of the building’s skin, ranging from white for warms regions to black for cooler areas. The results help us determine where insulation is needed and to make sure insulation has been installed correctly. A thermal scan can detect roof leaks because wet insulation conducts heat faster than dry insulation. Also, thermal scans can detect abnormally hot electrical connections or components of an electrical system and they can also detect the heat created by excessive friction of mechanical systems. Furthermore, BLUEGILL can perform thermal scans of the interior or exterior of a structure. However, interior scans are more common, because warm air escaping from a building does not always move through the walls in a straight line. Heat loss detected in one area of the outside wall might originate at some other location on the inside of the wall. Plus, it is harder to detect temperature differences on the outside surface of a building. Because of these reasons, interior surveys are generally more accurate because of the lessened air movement inside of the structure.
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