Open roof seams
Fallen air ducts in crawl space
Leak found over fire place due to improperly installed flashings
A chimney with no rain cap and an unlined chimney with loose brick and mortar joints
Leak found below second floor bathroom
Know if radiant floor/ceiling heat cables are operating.
DISCLAIMER
Thermal imaging is used as an aid to find moisture problems but does not guarantee leaks will be visible/detected at time of inspection.