Thermal imaging for flat roof inspection is a cost effective technique for evaluating the integrity of a wide range of built-up roofs and for reducing the cost of home maintenance and repair. The need for proper maintenance begins before leaks are evident inside the building since surface damage to the outer membrane can cause water to be absorbed into sub-surface layers. The retained water can result in major structural deterioration near the leak location as well as to healthy roofing areas. Through thermal roof inspection, moist and dry areas can be identified. Infrared imaging for roof inspection locates the areas where retained moisture is trapped in subsurface insulation allowing repair of only the damaged areas.