This is the result of an improperly flashed plumbing vent on the roof. Top pictures are in the upstairs bathroom where the leak started. Water traveled down the wall into the floor joists and spread

To the naked eye this ceiling appeared fine. With the infrared camera, I noticed an area of cooling where the ceiling meets the wall. Checking the area with a moisture meter revealed high

Radiant heating system underneath a tile floor. Checking the system has never been easier!

Lighter area in ceiling shows where insulation in the attic was scraped away by contractors working in the attic. The insulation was not replaced resulting in heat loss and higher energy bills.