Thermal Imaging uses the principle of mapping surface temperatures to produce an image of a surface. These surface temperatures allow us to look for areas of weak or missing insulation. It also allows us to look at surfaces such as walls and ceilings for moisture. Moisture can usually be detected even if there is no staining yet or if the stain has been covered or hidden by painting. Thermal imaging is NOT x-ray vision. It can not allow us to see inside walls. When properly used however, Thermal Imaging is a very powerful tool in evaluating any type of building.