Did a fairly new house, originally built in 2005 and vacant for the last 2 months.
On every inspection, I run all the water (toilets, sinks, basins and tubs) wil cold water for at least one minute so I can check for leaks.
Sure enough, downstairs from one of the 2nd floor bathtubs, I found this.
There was a small, cool spot. I went up to the bathroom and checked the tub and the toilet (both in the same area) and ran the tub hot. I watched as the thermal anomoly went hotter, which proved it was the tub. You can see, from the picture, the original cold spot and the larger, growing, hot spot. Moisture readings were also positive. Great way to verify.
The client was a relo and not at the inspection. He (and, surprisingly, the Buyer’s agent, who was there) was very happy that I had the camera. So am I, because I would never have found this if I hadn’t.
On a side note, the relo company had an inspection done before mine. They are located in Texas, but hired a local architect (who is not a state licensed HI, BTW). This is illegal in Illinois (inspection for a fee, of two or more systems in residential property). I notified the buyer’s agent who will notify the buyers lawyer (otherwise, she would be a party to a felony).
Hope they let the relo company know.