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Regardless of the sophistication of the laboratory, the ability to determine the cause of a coating failure can depend on the type and quality of the samples. This paper discusses the type of samples needed and gives suggestions on how to obtain them.
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Located on the banks of the Kanawha River surrounded by the rugged Allegheny Mountains, the gilded lead-coated copper dome of Cass Gilbert’s 1932 West Virginia State Capitol has never successfully weathered the harsh climate nor withstood the test of time. Although beautifully detailed and successful at resisting water infiltration, the dome’s appearance was problematic soon after its completion and has remained so even after four significant refinishing campaigns - in 1946, 1961, 1977 and most recently in 1988.
This paper discusses the use of thermal imaging as an analytical tool in forensic investigations of moisture-related coating failures applied over hollow core building walls. The success of thermal imaging depends upon detecting subtle temperature differences arising from differences in thermal conductivity of the coated wall surfaces. The method is a valuable adjunct to contemporary failure investigation methodology.
The Federal EPA requires that commercial/residential painting contractors be certified to prepare surfaces containing lead based paint on residential and public structures. As a result, when respirators equipped with HEPA filtration are required to be worn to reduce worker exposure levels to below the permissible exposure limit for lead, the surface preparation work is often subcontracted to a licensed lead abate contractor who holds these types of certifications.