Roof Moisture Survey: Reserve Center Garage, Grenier Field, Manchester, N.H.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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An insulated roof with a badly blistered bituminous builtup membrane was surveyed with a hand-held infrared camera to locate areas of wet insulation. Several thermal patterns were observed. Core samples were taken to determine moisture contents. Core samples verified that one thermal anomaly was caused by the increased thickness of bitumen. All other anomalies were caused by wet urethane-perlite composite insulation. Some insulation boards contained much more moisture near the edges than at the center, but others were more uniformly wet. Dramatically different thermal patterns resulted. A few nuclear and capacitance readings, taken for comparison purposes, showed that extra bitumen adversely affects such sensing methods. Because of the amount of wet insulation and the condition of the membrane, both should be removed. The new roofing system for this building should have internal drains and be provided with a sloped surface. Author
- Structural Engineering and Building Technology
- Printing and Graphic Arts
- Infrared Detection and Detectors