Infrared / Thermography Services
"Infrared (IR) inspection is a fast and noninvasive means of monitoring and diagnosing the condition of buildings. An IR camera can instantly identify problem areas that can be immediately documented with full color thermal pictures..."
For a more in depth look at Thermography please view the Primer on Infrared Thermography from the Infrared Training Center and FLIR.
"Thermography enables us to see and measure heat. All materials on earth emit heat energy, in the infrared portion of the spectrum. Unfortunately, the unaided human eye cannot see the infrared. Infrared images allow the camera user to see temperature anomalies that identify potential problems in buildings and their component electrical, mechanical, plumbing, and waterproofing systems."
from Communicator Magazine - Infrared Inspections: The Wave of the Future by Dick Price
U.S. Department of Energy - Energy Efficiency and Renewable Energy A Consumer's Guide to Energy Efficiency and Renewable Energy Thermographic Inspections Energy auditors may use thermography-or infrared scanning-to detect thermal defects and air leakage in building envelopes.
How They Work Thermography measures surface temperatures by using infrared video and still cameras. These 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 the auditor determine whether insulation is needed. They also serve as a quality control tool, to ensure that insulation has been installed correctly.
A thermographic inspection is either an interior or exterior survey. The energy auditor decides which method would give the best results under certain weather conditions. 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. Also, it is harder to detect temperature differences on the outside surface of the building during windy weather. Because of this difficulty, interior surveys are generally more accurate because they benefit from reduced air movement.
Thermographic scans are also commonly used with a blower door test running. The blower door helps exaggerate air leaking through defects in the building shell. Such air leaks appear as black streaks in the infrared camera's viewfinder.
Thermography uses specially designed infrared video or still cameras to make images (called thermograms) that show surface heat variations. This technology has a number of applications. Thermograms of electrical systems can detect abnormally hot electrical connections or components. Thermograms of mechanical systems can detect the heat created by excessive friction. Energy auditors use thermography as a tool to help detect heat losses and air leakage in building envelopes.
Infrared scanning allows energy auditors to check the effectiveness of insulation in a building's construction. The resulting thermograms help auditors determine whether a building needs insulation and where in the building it should go. Because wet insulation conducts heat faster than dry insulation, thermographic scans of roofs can often detect roof leaks.
In addition to using thermography during an energy audit, you should have a scan done before purchasing a house; even new houses can have defects in their thermal envelopes. You may wish to include a clause in the contract requiring a thermographic scan of the house. A thermographic scan performed by a certified technician is usually accurate enough to use as documentation in court proceedings.
The energy auditor may use one of several types of infrared sensing devices in an on-site inspection. A spot radiometer (also called a point radiometer) is the simplest. It measures radiation one spot at a time, with a simple meter reading showing the temperature of a given spot. The auditor pans the area with the device and notes the differences in temperature. A thermal line scanner shows radiant temperature viewed along a line. The thermogram shows the line scan superimposed over a picture of the panned area. This process shows temperature variations along the line. The most accurate thermographic inspection device is a thermal imaging camera, which produces a 2-dimensional thermal picture of an area showing heat leakage. Spot radiometers and thermal line scanners do not provide the necessary detail for a complete home energy audit. Infrared film used in a conventional camera is not sensitive enough to detect heat loss.
Preparing for a Thermographic Inspection To prepare for an interior thermal scan, the homeowner should take steps to ensure an accurate result. This may include moving furniture away from exterior walls and removing drapes. The most accurate thermographic images usually occur when there is a large temperature difference (at least 20°F [14°C]) between inside and outside air temperatures. In northern states, thermographic scans are generally done in the winter. In southern states, however, scans are usually conducted during warm weather with the air conditioner on.
Learn More Department of Energy Resources Tracer Technology Center Brookhaven National Laboratory Reading List Snell, J. (January 2002). "Is There a New IR Camera in Your Future?" Energy Design Update (22:1); pp. 7-9. Snell, J. (March/April 2002). "The Latest in Hot Shots." Home Energy (19:2); pp. 14-17. Eads, L. et al. (March 2000). "Practical Guide to Thermography." ASHRAE Journal (42:3); pp. 51-55. Infrared Thermography Fact Sheet (PDF 1.1 MB). (September 2005). Washington State University Energy Program and Western Area Power Administration.
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