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Connecting the Dots

One of the most challenging aspects of performing infrared inspections involves directing a qualified assistant in outlining exceptions on the surface of the ground or an insulated roof.

Thermographers who perform infrared inspections of flat roofs or underground piping systems often outline the perimeter of exceptions with spray paint. Directing a qualified assistant to accurately outline exceptions can be both time-consuming and frustrating. The following suggestions can help to speed inspections while preserving coworker relations.

• When using spray paint to mark at ground level, use a spray paint and dispenser designed for the task
• Make sure surfaces to be marked are clean and dry and will not be damaged by spray paint
• Never spray paint where wind may carry paint to unintended surfaces
• Be certain of target before marking – make certain shoes/hands are clear
• Consult Material Safety Data Sheets before using spray paint for any health and usage precautions

When outlining the perimeter of an exception, use a series of dots to outline the most prominent features of the exception. These dots can then be connected with a solid line once their location is deemed satisfactory. Depending upon weather and target conditions, spray painted lines will often show clearly within the thermal image.

Infrared inspection of flat roofs is one of the many topics covered in all Infraspection Institute Level I training courses. For more information on thermographer training or to obtain a copy of the Standard for Infrared Inspections of Insulated Roofs, visit Infraspection.com or call us at 609-239-4788.