There is no single best termite control method. The most effective approach depends on which type of termite you’re dealing with, whether your home is already infested or you’re trying to prevent an invasion, and how much of the structure is affected. Subterranean termites, which come up from the soil, require fundamentally different strategies than drywood termites, which live entirely inside wood. Understanding the options lets you match the right treatment to your specific problem.
Liquid Soil Barriers for Subterranean Termites
Liquid termiticides applied to the soil around and beneath a structure are the most widely used defense against subterranean termites. A professional digs a shallow trench along your foundation, applies the chemical, and backfills it, creating a treated zone that termites must pass through to reach your home. The treatment typically extends along the entire perimeter and around any points where plumbing or other utilities enter the slab.
These treatments work in two ways depending on the product. Some are repellent, driving termites away from the treated soil. Others are non-repellent, meaning termites pass through without detecting the chemical and carry it back to nestmates. In theory, non-repellent products should spread through a colony and cause widespread die-off. In practice, research from the Journal of Economic Entomology paints a more nuanced picture. Termites exposed to treated soil die quickly, but the dead individuals create a “death zone” that surviving termites learn to avoid. In field trials, colonies located just 1.5 meters from a treated area lost as little as 23.5% of their population, and all colonies survived. Colonies farther away lost even less, sometimes just 1.5% over 200 days.
This doesn’t mean soil treatments fail to protect your home. They do create a lethal or repellent barrier right at the foundation. But they rarely eliminate the entire colony underground, and their protective lifespan varies widely depending on soil conditions, rainfall, and the specific product. Half-life can range from a few weeks to several years. Professional retreatment every few years is standard practice. Costs for liquid barrier treatments generally run $3 to $18 per linear foot of your home’s perimeter, depending on your region and the complexity of the job.
Baiting Systems: Slower but Colony-Wide
Termite bait stations take a different approach. Plastic stations containing a slow-acting toxic bait are installed in the ground every 10 to 15 feet around your home’s perimeter. Foraging termites find the bait, feed on it, and share it with the colony. Because the active ingredient kills slowly, it spreads through the colony before termites can associate the bait with danger.
The major advantage of baiting is its ability to eliminate entire colonies rather than just blocking them at your foundation. The tradeoff is time. Colony elimination typically takes several months after termites begin feeding on the bait, and that timeline varies based on season, weather, and colony size. In winter or during dry spells, foraging slows dramatically, extending the process. Bait stations also require ongoing monitoring, usually through an annual service contract, since new colonies can always move into the area.
Many pest control professionals recommend combining a liquid barrier for immediate protection with a baiting system for long-term colony suppression. This layered approach addresses the weakness of each method used alone.
Fumigation for Drywood Termites
Drywood termites don’t come from the soil. They fly directly into your home and establish colonies inside the wood itself, making soil treatments useless against them. When an infestation is widespread or hidden within walls, fumigation (tenting) is the most reliable option.
During fumigation, your entire home is sealed under a tent and filled with a lethal gas, typically sulfuryl fluoride. The gas penetrates every piece of wood in the structure, killing termites in locations you’d never be able to reach with a drill or spray nozzle. The gas is held inside the structure for roughly 16 to 30 hours, then ventilated. You, your family, and your pets must leave the home during this period and for a window afterward while the gas clears.
Fumigation’s biggest advantage is that it’s not detection-dependent. Current methods for locating drywood termite colonies inside walls are unreliable, so you can never be fully confident that a targeted treatment reached every infestation. Fumigation bypasses this problem entirely by treating the whole structure at once. The gas leaves no residue, which means it provides zero ongoing protection against future infestations, but it handles what’s already there with high confidence. Costs range from about $1 to $4 per square foot of your home, putting a typical single-family home somewhere between a few hundred dollars for a small spot treatment and $7,600 or more for full tenting of a large house.
Localized and Heat Treatments
If you catch a drywood termite infestation early and it’s limited to an accessible area, spot treatments can work. These involve drilling into the infested wood and injecting a termiticide or foam directly into the galleries. The cost is dramatically lower than fumigation, and you don’t need to leave your home. The risk is that you’re betting everything on having found all the infested wood, and hidden colonies behind walls or in attic framing are easy to miss.
Heat treatment is a non-chemical alternative that works by raising the temperature inside infested wood to lethal levels. Lab research has shown that a wood-core temperature of about 54°C (130°F) sustained for one hour kills drywood termites completely. In field applications, professionals use propane or electric heaters to bring treatment zones to at least 46 to 50°C and hold that temperature for around two hours to account for insulation effects and hard-to-heat pockets. Heat can be applied to a single room or section of a home, which makes it useful when you want to avoid tenting but know where the infestation is concentrated. Like fumigation, heat leaves no residual protection.
Physical Barriers for New Construction
If you’re building a new home or addition, physical barriers deserve serious consideration. High-grade stainless steel mesh installed beneath concrete slabs and inside cavity walls creates a permanent block that subterranean termites simply cannot penetrate. After five years of testing across multiple sites, U.S. Forest Service research found stainless steel mesh remained 100% effective as a termite barrier, with zero penetration. Unprotected wood in the same test plots suffered severe damage.
The mesh is made from marine-grade stainless steel with openings too small for termites to pass through, and manufacturers claim a useful life of several decades. Thousands of homes and commercial buildings in Australia use this technology, and demonstration homes in Florida have been fitted with it as well. Post-construction installation methods exist, where the mesh can be adhered to concrete or masonry surfaces, but the approach works best when integrated during the building phase. Physical barriers eliminate the need for chemical retreatment cycles, making them a strong long-term investment for new builds.
Borate Wood Treatment for Prevention
Borate-based products applied directly to wood provide long-lasting protection against termites, wood-boring beetles, carpenter ants, and decay fungi. The active ingredient, a boron compound, penetrates into the wood fibers and remains there. When termites or other wood-destroying insects feed on treated wood, the borate disrupts their digestion and kills them.
Borate treatments are most practical during construction or renovation, when wall framing and structural lumber are exposed and accessible. Once applied at the proper concentration and allowed to dry, the treatment can protect wood for up to 30 years. It’s odorless, low in toxicity to humans and pets, and doesn’t break down over time the way soil-applied chemicals do. The limitation is that borate is water-soluble, so it’s not suitable for wood that will be exposed to rain or standing water unless sealed afterward.
Choosing the Right Approach
For an active subterranean termite infestation, a liquid soil barrier provides the fastest protection, and adding a baiting system gives you the best shot at knocking out the colony over the following months. For drywood termites affecting multiple areas or hidden within walls, fumigation is the most thorough single treatment available. If the infestation is small and localized, spot treatment or heat treatment can save you significant money, though both carry more risk of missing hidden colonies.
For prevention in new construction, combining a physical barrier like stainless steel mesh with borate-treated lumber creates a defense system that can last decades without chemical retreatment. For existing homes without active infestations, a maintained baiting system around the perimeter serves as both an early warning system and a first line of defense. Most professionals will inspect your home, identify the termite species involved, and recommend a combination of methods tailored to your situation, because in practice, the best termite control is rarely a single method. It’s a layered strategy.