Pinhole (Holiday) Testing – Water Leak Detection

We pioneered the use of high voltage leak detection for some flat roof applications in the early 1990’s. Until that time it had been used only for testing bridge deck membranes. It is particularly useful for leak detection in single ply and liquid applied waterproofing membranes.

Pinhole testing, otherwise known as the high voltage or “Dry Test” method, again relies on the insulating properties of most membranes.

A high voltage is passed through a copper brush which is swept across the surface of a dry roof. Any breaches are indicated by an alarm triggered when an electrical path to earth is detected. A precise location of the breach can then be located by the operator.

Our Electronic Leak Detection service of waterproofing membranes is widely used or recommended by Roofing Companies, Main Contractors and Material Manufacturers who need the assurance that their waterproofing is free from breaches before completion of a project. For that reason, we have built up numerous, long standing working relationships with contractors in the sector over the past three decades, who have come to rely on our high levels of attention to detail and customer focused ethic.

In some circumstances, however, electronic testing is not possible. For example, EPDM membranes are electrically conductive, in which case Thornton Consulting may be able to offer our Differential Pressure Test, whereby air is drawn through surfactant over laps, thereby testing them for integrity. For further details please contact our office.

HV Testing for Roof Leak Detection