Ronald Ray, writing for Construction Specifier, has a great article on different methods for detecting, diagnosing and pinpointing the location of leaks within various types of roofs. What makes Ray’s article so great is some of the cool new technologies outlined representing the bleeding edge of building forensics:
All roofs eventually leak—it is just a matter of when and where. Nevertheless, the hope is that new roofing systems do not leak right from the start. It is critical to verify the watertightness of roofing, especially if it is to be covered with ballast or a vegetated roof assembly. This verification is a field quality-control measure beyond the scope of a roofing manufacturer’s visual inspections for issuance of a warranty. For existing buildings being considered for a reroofing program, conducting a roof survey to determine the location and extent of wet substrates is essential to making fiscally responsible decisions related to the program’s extent…
Other technologies, such as electronic leak testing, can detect leaks with far more reliability than flood-testing. Some electronic leak-testing methods include:
- electrical capacitance/impedance testing;
- infrared thermography;
- nuclear hydrogen detection;
- low-voltage electrical conductance testing; and
- high-voltage spark testing.