JAMES SCHWEIKER / SCIENCE PHOTO LIBRARY JAMES SCHWEIKER / SCIENCE PHOTO LIBRARY
Infrared thermography is useful in detecting areas of moisture in built-up roofs because the moisture is heated during the day by solar radiation and that heat is re-emitted at night. Thus wet sections of a roof show up hot, (white), and dry areas appear cool, or dark. The wet area detected during a survey is outlined directly on the roof surface with spray paint.
Model release not required. Property release not required.