How to Read Infrared Images with Examples
The first toilet has a noticeable water leak while the second toilet does not. Because the water temperature (Spot 1, Picture 1) is colder than the flooring temperature (Spot 2, Picture 2) we can see the extent of the water leak. Leaks under waterproof flooring can easily go unnoticed.
Picture 2 only shows colder temperatures in the toilet bowl where the water is.
The leaking roof above this room can easily be seen with an infrared camera because the water coming in was colder the wood in the ceiling. The green and yellow areas show varying degrees of wetness while the red areas were dry. Notice, the photo on the right shows little evidence of a problem.