How Thermal Imaging Actually Works
An infrared camera does not see moisture, mold, or wires. It sees surface temperature. Every object above absolute zero emits infrared energy, and the camera converts that energy into a temperature map you can read as colors or grayscale. Your job is to interpret why one area is warmer or cooler than another and what that means for the building.
Moisture shows up indirectly. Wet materials hold and move heat differently than dry ones, and evaporation cools a wet surface. So a damp area often reads cooler than the dry material around it, which is why you scan for temperature anomalies, not water itself. This is also why thermal imaging alone never confirms moisture. It only points you to where to investigate.
Learn your camera controls before you scan. Level and span (sometimes called thermal tuning) set the temperature range the colors represent. A wide span hides small differences, while a narrow span exaggerates them and makes subtle anomalies pop. Choose a palette you read well; many inspectors prefer grayscale or ironbow for consistency.
Finally, respect resolution and distance. Each pixel averages the temperature of an area, so the farther you stand, the larger that area and the more small details blur together. Get close enough that the suspect area fills a meaningful part of the frame, and capture a matching normal-light photo so anyone reading your report knows exactly what they are looking at.