Thermography measures surface temperatures by using infrared video and still camera. Those tools see light that is in the heat spectrum. Images on the video or film record the temperature variations of the building’s skin, ranging from white for warm regions to black for cooler areas. The resulting images help to determine whether insulation or sealant is needed. They also serve as a quality control tool, to ensure that insulation has been installed correctly.
This is to check that a chimney is sound and has integrity. It is important to do this if you are not using a liner. Even when fitting a liner you may prefer to do this test if you are planning to pour vermiculite (insulation) around your liner in case the insulation escapes through damage in the chimney.
The test is often done in older buildings to check smoke does not escape into the building.
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