How it Works..

Using a principle called neutron moderation, scientists discovered that tiny amounts of radiation can be used to detect hydrogen ions, which in a roof system typically indicate water. Neutrons emitted from an isotopic source collide easily with the highly exposed neutrons of hydrogen, and these collisions slow their travel. By detecting changes in the speed of the emitted neutrons, we can safely identify moisture damage deep within the roof.

To accurately analyze the data from this extremely sensitive nuclear detection technology, we must account for the original hydrogen content of the roofing materials. By utilizing small amounts of invasive testing, hydrogen readings are established for dry materials. After dry material baselines are established, elevated hydrogen counts indicate moisture damage in the roof system.

A nuclear roof moisture survey is typically conducted on a 10’ x 10’ grid pattern across the entire roof surface. On ballasted roofs, the gravel will be temporarily moved aside in order to place the nuclear gauge directly on the roof surface. Readings are taken at each grid intersection to build a hydrogen inventory of the roof system.

Next, we tabulate and analyze the collected data using statistical and visualization software. Using these diagnostic tools, we convert the raw data produced by the nuclear gauge into an AutoCAD® map of moisture penetration inside the roof system.