The standard treatment for subterranean termites requires that you drill holes deep into the soil and inject a strong chemical every 16 inches completely around the perimeter of your house. This provides a long lasting poison soil barrier to prevent termites from invading the house. The treatment is really not a do it yourself project and should be done by a professional, especially because the chemical is dangerous. Spraying chemicals above ground will not prevent or eliminate subterranean termites. There may be other types of above ground termites for which spraying may be effective. But, subterranean termites can live in the soil under your house and travel up and down into the house and slowing eat the wood and drywall material, and can cause major damage over a period of years. Maintaining a termite contract is worth the cost for peace of mind and for reselling your house.
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