Water Damage can occur inside or outside.
Depending on circumstances water can leak or enter wood in a variety of ways. Improper flashing at a roof or leakage near a shower of bath can result in damage occurring and often times tracing its way to the ground. If this happens it can reduce the amount of termiticide needed to prevent termites from entering a home.
Termites are a threat to your home and result in over 5 billion dollars of damage each year in the U.S. Termite treatment is a job best handled by Professional Pest Management companies due to the equipment and techniques needed to perform the work.