Office: Sayells Farm, 7 Harlington Road, Upper Sundon, Bedfordshire,
Accredited to ISO/IEC 17025:2005
A UKAS Accredited Company Registered in England & Wales No. 527550
Thermographic Inspections to Show Thermal
Defects on your Building Envelope
How They Work
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.
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 assessment, 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.
Preparing for a Thermographic Inspection
To help you further prepare for your Thermographic survey please see our comprehensive Thermographic Preparation Checklist
If you are a facilities manager and require ongoing diagnosis infrared surveys on your electrical and mechanical installations, please use our annual survey data form. The form is in a word format so please save to your computer and fill it in as required and send it back to us at firstname.lastname@example.org. Once we receive the information it should be all we need to undertake ongoing infrared surveys at your facility.
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