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Survey Types |
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| Impedance (Capacitance)
Water conducts electricity. A moisture-detecting machine is rolled along the roof surface. Electrodes transmit a wave signal through the membrane. If a signal contacts moisture, the signal is ttransmitted back to the detector. The signal is transmitted audibly through a warning horn and visually on a meter. Electrodes follow irregularities on the roof surface and take continuous readings. Infrared Infrared detects heat loss. Wet roof insulation more readily transmits heat energy than dry |
insulation. Infrared surveys are performing at night using an imaging system that, detecting infrared radiation, converts it to a video signal and reproduces it as an image on a monitor. Nuclear The theory of nuclear is determining the response time of emitted neutrons. A lightweight neutron gage emits radiation into the roof. High energy neutrons are strongly moderated or slowed down by collisions with hydrogen atoms in the moisture present. Digital reading range from four to thirty seconds. |
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