On the home page of my web site you will find a wall that had termite damage on the inside. with the Infrared Camera we could see just how bad the damage was...
INFRARED ( Making the invisible visible )
Excellence Exterminating Co.
One does not need to tear the house down to observe these things. Also, look in the attic, and if one can get under the house if it is raised, look at the front and rear sills, and where the sewer and water lines enter the home.