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Abstract
Since 1975, CRREL has used hand-held infrared scanners for detecting wet insulation under built-up roof membranes. Thermo-couples installed on roofs have shown that temperature differences between areas of wet and dry insulation may exist during the day and night. The optimum time to detect these differences with an infrared camera is at night when solar interference in eliminated. Surveys have been conducted successfully in many locations from Alabama to Alaska during warm and cold weather. Three-inch-diameter core samples of the roof membrane and insulation have been obtained to verify infrared findings. This paper briefly overviews the technique used to survey roofs for moisture and then presents results of a controlled experiment at Pease AFB, New Hampshire, to show the correlation between thermal images and temperature differnces observed thermo-electrically in wet and dry portions of a roof. Measurements of the thermal resistance of the wet and dry areas complete the physical picture.
Since 1975, CRREL has used hand-held infrared scanners for detecting wet insulation under built-up roof membranes. Thermo-couples installed on roofs have shown that temperature differences between areas of wet and dry insulation may exist during the day and night. The optimum time to detect these differences with an infrared camera is at night when solar interference in eliminated. Surveys have been conducted successfully in many locations from Alabama to Alaska during warm and cold weather. Three-inch-diameter core samples of the roof membrane and insulation have been obtained to verify infrared findings. This paper briefly overviews the technique used to survey roofs for moisture and then presents results of a controlled experiment at Pease AFB, New Hampshire, to show the correlation between thermal images and temperature differnces observed thermo-electrically in wet and dry portions of a roof. Measurements of the thermal resistance of the wet and dry areas complete the physical picture.
Date
9/1977
9/1977
Author(s)
Charles Korhonen; Wayne Tobiasson
Charles Korhonen; Wayne Tobiasson
Page(s)
15
15
Keyword(s)
wet insulation; infrared camera; temperature differences; thermal images; thermal resistance
wet insulation; infrared camera; temperature differences; thermal images; thermal resistance