Thermography lets us see into the infrared spectrum revealing hidden anomalies that the human eye and standard visual inspections can not see. One of the biggest threats to a commercial roof is water; it can get trapped under the roof system. Leading to mold, mildew, or roof damage resulting in leaks into the building, potentially damaging equipment, or total roof failure. The ideal time for these inspections is 48 – 72 hours after heavy rainfall and 2 hours after sunset. These conditions allow the water to penetrate the membrane, let any rooftop pooling of water evaporate, non-damaged portions of the roof cool very rapidly, and the water-saturated areas remain warm many hours after sunset.