Ortho does sell a product specifically labeled for termites, but it’s not the one most people have in their garage. The standard Ortho Home Defense Max Indoor Insect Barrier, the popular spray used around baseboards and doorframes, is not designed or labeled for termite control. The product you need is a separate formula called Ortho Home Defense Termite & Destructive Bug Killer, a concentrated liquid you mix with water and apply to the soil around your foundation. Even that product has significant limitations compared to professional termite treatments.
Which Ortho Product Actually Targets Termites
The Ortho Home Defense Termite & Destructive Bug Killer is a concentrated formula designed to create a chemical barrier in the soil around your home’s perimeter. To use it, you dig a trench around the foundation, mix the concentrate with water, and pour it into the trench with a watering can. Ortho claims it kills termites for up to five years (with exceptions in Massachusetts, New York, and Rhode Island, where that claim isn’t permitted).
The product label says you should not reapply the full treatment annually. Reapplication is only intended as a spot treatment when the chemical barrier has been physically disrupted by construction, excavation, or landscaping. This matters because it means you’re relying on a single application to hold up for years, and any gaps in coverage leave an opening.
The regular Ortho Home Defense Max that millions of people spray around their homes targets ants, roaches, spiders, and other household pests. Termites are not on its label. Spraying it on termites you find indoors will not solve a termite problem, because the colony lives underground, not inside your walls.
Why Barrier Chemicals Have a Weakness Against Termites
The Ortho termite product uses a barrier approach: it treats the soil so termites die or turn away when they try to tunnel through it. This strategy has a fundamental limitation. The active ingredient in most over-the-counter termite barriers, bifenthrin, is a pyrethroid that repels insects. Termites can detect its presence in the soil and simply route around treated areas to find untreated gaps.
Professional pest control companies often use non-repellent chemicals instead. These work on a completely different principle. Termites can’t detect the treated soil, so they walk through it, pick up the chemical on their bodies, and carry it back to the colony. Because termites are social insects that constantly groom and feed each other, the chemical spreads from exposed workers to nestmates that never touched the treated soil. This “transfer effect” can suppress or eliminate the entire colony over weeks.
A repellent barrier like bifenthrin kills termites that contact it directly, but those termites die too quickly to spread the chemical to others. The colony itself survives. If there’s even a small gap in your trench treatment, an untreated root channel, a crack in the foundation you missed, termites can find their way through. Professional applicators use specialized equipment to inject hundreds of gallons of termiticide deep into the soil at precise intervals, something a watering can simply can’t replicate.
How Professional Treatments Differ
Licensed termite treatments typically involve two components: a horizontal barrier of treated soil underneath the building and a vertical barrier around the exterior foundation. For existing homes, professionals drill through concrete slabs, inject termiticide under pressure into the soil beneath the foundation, and treat the full exterior perimeter at carefully measured intervals. The goal is a continuous, unbroken zone of treated soil with no gaps for termites to exploit.
The most commonly recommended active ingredients for professional liquid treatments include fipronil, imidacloprid, and chlorantraniliprole, all non-repellent chemicals that allow the transfer effect described above. Bifenthrin and other pyrethroids are also used professionally, but they’re applied with high-pressure injection equipment that ensures more thorough soil saturation than a DIY trench-and-pour method can achieve.
Professionals also use foam treatments that can be injected into wall voids and foundation cracks to supplement the soil barrier, plus borate wood treatments applied to framing lumber during construction. Bait stations are another common approach, where termites feed on a slow-acting toxin and carry it back to the colony. None of these methods are available in the Ortho product line for consumers.
When DIY Termite Treatment Makes Sense
The Ortho termite product is positioned as a preventative measure. If you have no evidence of an active termite infestation and want to add a layer of protection around a shed, detached garage, or fence posts, a DIY soil barrier is a reasonable step. It can kill termites that attempt to cross the treated zone, and for small, accessible structures where you can ensure complete coverage, it provides some level of protection.
For your actual home, the stakes change. Termites cause billions of dollars in structural damage annually in the United States, and most homeowner’s insurance policies don’t cover it. An active infestation means there’s already a colony with established tunnels reaching your foundation, and a partial barrier applied from the surface is unlikely to cut off every entry point. The cost of a professional treatment, typically ranging from $500 to $2,500 depending on your home’s size and the method used, is small compared to the cost of structural repairs if termites go unchecked.
If you’ve spotted mud tubes on your foundation, found winged termites swarming indoors, or noticed soft or hollow-sounding wood, those are signs of an established colony. In that situation, the Ortho termite product is not a substitute for a professional inspection and treatment plan. It can serve as a supplement or a preventative for low-risk structures, but it wasn’t designed to eliminate a colony that’s already found its way into your home.