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https://hdl.handle.net/11681/11707| Title: | Summary of Corps of Engineers research on roof moisture detection and the thermal resistance of wet insulation |
| Authors: | Tobiasson, Wayne. Korhonen, C. J. (Charles J.) |
| Keywords: | Aircraft Maintenance Roofs Roofing Detectors Measurement Surveys Images Moisture Test methods Inspection Personnel Instrumentation Reliability |
| Publisher: | Cold Regions Research and Engineering Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 78-29. |
| Description: | Special Report Abstract: Nuclear, infrared, capacitance, microwave and impulse radar methods for nondestructively detecting moisture in roofs were evaluated. No system was reliable enough by itself or by cross-checking with another system to eliminate the need for a few core samples of membrane and insulation to verify findings. Airborne infrared surveys are a cost-effective way of reconnoitering numerous roofs at a major installation. However, follow-up on-the-roof surveys are necessary. Of the several grid techniques examined, nuclear surveys were the most reliable. Hand-held infrared surveys are the most accurate on-the-roof method studied. Although an infrared camera costs significantly more than a nuclear meter ($27,000 vs $3,000), infrared surveys can be conducted more rapidly. Where numerous roofs are to be surveyed, infrared surveys appear to be the most cost-effective method. In-situ measurements have been madeof the thermal resistance of wet and dry portions of roofs. A laboratory apparatus has been built to subject 12 in. x 12 in. specimens of roof insulation to combined thermal and moisture gradients. Thermal resistance and moisture content are periodically determined and characteristic curves are being developed for various roof insulations. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/11707 |
| Appears in Collections: | Special Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| SR-78-29.pdf | 742.18 kB | Adobe PDF |  View/Open |