Thermal imaging is successfully used to help identify potential moisture problems in low-slope roofs. This paper will address the various reasons for inspecting a roof, the conditions needed, how an infrared inspection works, and the types of thermal patterns detected. The limitations of the technology as well as alternative test methods including aerial IR inspections are also covered. Conditions permitting, a qualified operator who follows proper inspection standards is able to evaluate a low-slope roof for moisture quickly and efficiently with infrared.