A house is treated for subterranean termites by inserting a metal rod about 18 inches deep into the ground and pumping a chemical into the soil every 16 inches around the entire perimeter of the house. This process poisons the soil and creates an underground poison soil barrier around the house. Subterranean termites live underground and travel up and down into the house eating soft woods, drywall, and carpet. You never see them because they cannot stand the light. Once they move in, they never leave. The only time you see them is once per year when they mate and some of them fly away to find another house. Spraying chemicals aboveground will do nothing to kill or deter subterranean termites. Aboveground spraying may kill ants and other insects, but it will never kill any subterranean termites because they never come to the surface.
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