Water intrusion occurs in a number of ways, through and/or around building components such as windows, doors, gable vents, penetrations, variety of flashing and construction details. Water intrusion also occurs when maintenance of these components and other critical areas like caulk joints, is ignored. It is important to discover the occurrence of water intrusion as water can enter behind the cladding and wet unprotected substrate (sheathing), and in some cases the wood structural members. Depending upon climate and the overall makeup of the wall assembly, the wall may not readily dry out. As water intrusion continues to occur undetected in a particular area, it can accrue to levels substantial enough to cause damage. Early detection of water intrusion is the key to minimizing or preventing such damage.