A METHOD AND APPARATUS TO DETECT AND LOCATE DAMAGE AND BREACHES IN ROOF MEMBRANES

摘要

A leak in a membrane on top of a horizontal roof deck is located by a manually operable carriage which is swept over the upper surface of the membrane on the roof deck. A measuring and switching circuit generates a voltage havi ng a positive attached to the roof deck and a negative attached to conductive brushes on the carriage. The brushes are arranged to form an outer peripheral contact with an inner contact inside the outer contact. Thus the presence of a leak is detected by the outer set of conductive brushes at distance from the leak and by the inn er conductive brush when directly over the leakage site.