This will depend on the type of termite barrier. Chemical termite barriers can last for over one year depending on the active chemical used and type of soil and foundation it is applied to. There are other factors such as weather and limitations in application. A physical termite barrier can last up to eight years on average.
Termite barriers applied by a professional are an extremely effective defense against termite infestation. Your home may not yet be affected, however the property next door could have a problem that spreads to you. A termite barrier is your best bet to keep termites from ever entering your home.
A chemical termite barrier is a chemical solution sprayed on your home’s foundation and the soil surrounding it. These long lasting chemicals will create an effective barrier against invading termites. However these types of termite barriers will have a shorter effective period in areas experiencing consistent heavy rains.