Patent ID: 7652481
Filing Date: 2010-01-26
Classification: E04D,G01M

Abstract:
1. A method of locating a defect in a roof, where the roof comprises a generally horizontal roof support deck with a water impermeable membrane applied onto the upper surface of the support deck, the method comprising: applying conductive detectors on the top surface of the roof membrane in a grid pattern providing indications of distance in x and y direction across the membrane with each conductive detector being electrically insulated from each other; providing a measuring and switching circuit for generating an electrical potential between two components of the circuit; operating the circuit to connect one of the components of the circuit to the roof support deck on the under side of the membrane and the other of the components to at least one of the conductive detectors on the top surface of the roof membrane to cause a potential difference between the roof support deck and said at least one of the conductive detectors; and operating the circuit to sense at each of the conductive detectors in turn the current flowing therein in response to the potential difference; and analyzing the sensed currents in the x and y directions to locate the defect in the membrane.