Troxler Surveys

Troxler Survey

Using RoofReader™ Roof Moisture Gauge Model 3216

Our moisture mapping inspections can substantially reduce your repair and replacement costs for ballasted and multiple-construction roofs by:

  • Targeting problem areas for effective repair  
  • Identifying sound roof sections for conservation   
  • Creating money-saving replacement options   
  • Improving specifications for more competitive bidding  
  • Providing independent, objective information about the real condition of your roof system to help you make sound decisions and sift through conflicting opinions and advice.  

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.

A roof moisture survey is typically conducted on a 1m x 1m grid pattern across the entire 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 troxler gauge into an AutoCAD® map of moisture penetration inside the roof system.  
Nuclear moisture detection is the only meaningful method for testing ballasted roofs and the underlying sections of multiple-construction roof systems.  Troxler surveys provide excellent information at low cost, and substantially improve your roofing options.