Wet roofing and insulation:
- conduct rather than resist heat.
- lose their abilities to resist thermal and dynamic stresses.>
- lead to the disintegration of the insulation and fasteners.
- accelerate the deterioration of the roof membrane system.
- cause damage to structural decks, joists and columns.
- compress and allow water to pond on the roof.
Infrared Scanning detects temperature differences as energy radiates from the
surface of the roof. Scans are conducted on the rooftop after sunset. During Summer, roofs
retain some of the heat they absorb during the day. After sunset, they release this heat.
Wet materials, however, act as a heat sink and release their heat more slowly. During
Winter, wet insulation more readily conducts interior heat through the roof. In both
cases, heat release rates that differ from surrounding materials are detectible through
thermography. Photographs of both daytime conditions and infrared images and a roof
moisture map are provided in the scan report.
Infrared Scanning and Radioisotopic Surveying can be performed on in-place roofs
to detect indications of excess moisture in insulation layers and roofing. This service is
particularly applicable when designing a roof management plan for industrial or
institutional complexes, when planning roof recovery work, and when evaluating
multilayered roofing and roofing over cementitius or fibrous decks. Both technologies have
proven themselves useful in tracing difficult to locate leak sources.
Radioisotopic or Nuclear Surveying detects the density of hydrogen (water and
hydrocarbons) within the roofing assembly. IRCA conducts these surveys on the roof during
daylight. The roof is laid out in a survey grid with intersections marked on the roof. At
each intersection a density reading from a roof moisture gauge is collected and recorded.
Roof samples are taken to quantify density readings. Once the field work is complete, the
data is processed and the roof samples are analyzed. Among other vital information, a
computerized topographic map showing roof moisture levels and locations is produced and
included in the survey report. |