How Long Does a Termidor Treatment Last?
Termite damage is slow, quiet, and expensive to put right, so the length of protection a treatment actually gives you is a fair question to ask before paying for one. Here is what the product claims, what shortens it in practice, and what it should be paired with.
The manufacturer claims up to ten years. Your site conditions decide whether you get it.
BASF, which makes Termidor, states that a correctly applied treatment can protect a structure for up to ten years. That is the product claim and it is backed by long-running field trials, but it describes an undisturbed treated zone around a structure that has not changed since application.
Very few houses stay undisturbed for a decade. A treated zone is a continuous band of treated soil, and anything that breaks that band or bridges over it gives termites a route in. So the honest answer is that the treatment itself has a long service life, and the thing that usually ends it early is something done to the property afterward.
No termite treatment makes a structure permanently termite-proof, and any company telling you otherwise is overselling. What a good treatment plus regular inspection does is make an infestation something you catch early instead of something you discover through a soft floor joist.
Three approaches, different service lives
These are usually presented as alternatives. In practice the stronger setup uses more than one.
Bait stations
Stations are buried in a ring around the structure and carry an active ingredient that foraging workers take back to the colony. They need checking and servicing on a schedule, typically annually, which is more upkeep than a liquid treatment. Their real strength is monitoring: they tell you whether anything is active out there, long after a liquid treatment has gone quiet.
Conventional liquid barriers
Applied around the base of the structure to create a treated zone. Most conventional liquid termiticides are repellent, meaning termites detect the treated soil and turn away from it. Expected service life is commonly cited in the five-year range, and they need far less attention than stations.
Termidor
Also a liquid, applied along the base of the structure to form a continuous treated zone. Hard surfaces near the foundation sometimes have to be drilled so the treatment runs unbroken beneath them. Application on a typical home is usually a single day’s work.
Why non-repellent matters
Most liquid termiticides are repellent. Termites detect the treated soil and go around it, which means the treatment works by exclusion and any gap in the band is a door. Termidor is non-repellent, so termites cannot detect it and walk through the treated zone as though it were ordinary soil.
That changes what the treatment does. It works on contact as well as ingestion, so a termite does not need to eat anything to pick up a dose. Because termites groom each other constantly and share food mouth to mouth, an exposed worker carries it back into the colony and passes it on. The manufacturer calls this the Transfer Effect, and it is why a non-repellent product can reach parts of a colony the treatment never physically touched.
It is labelled for subterranean, drywood, dampwood, and Formosan termites, and it binds to soil rather than moving through it, which is why it is applied as a zone rather than broadcast.
This is not really an either-or
A bait station only works if termites find it. Nothing guarantees that a foraging worker crosses a station on its way to your house, which is why a stations-only program can run for months before it shows results. A liquid zone does not have that problem, because it sits between the soil and the structure and every route in crosses it.
Stations earn their place afterward. Once a liquid treatment has dealt with the active colony, stations are what tell you whether anything new has moved into the area, year after year, without anyone having to open up a wall to find out.
Bait stations are serviced annually. A liquid zone is measured in years. Running both is not redundancy, it is treatment plus early warning.
Five ways a treated zone gets breached
- Wood in direct contact with soil, which bridges over the treated zone entirely
- Firewood or lumber stacked against the exterior foundation
- Standing water against the foundation or in a crawlspace
- Heavy landscaping and deep mulch beds banked up against the structure
- Untreated material added against the foundation during later construction or a remodel
Any of these can mean a retreatment is warranted well before the ten-year mark. This is also the argument for follow-up inspections rather than treating and forgetting: an inspector checking the zone will find a breach while it is still just a breach.
Find out what is actually protecting your structure
If you do not know when your property was last treated, or whether the treated zone is still intact, an inspection will tell you. Our termite technicians can assess the structure and the conditions around it.
Keep reading
Signs of Termites & What To Do About Them
Termite infestation is a common problem in the US, with more than 600,000 homes affected yearly. Here are the signs of termites to watch out for.
Read articleTermitesAnts vs. Termites: How To Tell the Difference
They look similar, but ants and termites do different degrees of damage. Learn how to tell the two apart, point by point.
Read articleTermitesTermite Season in Texas
When termites swarm in Texas, and what homeowners should do to protect their biggest investment.
Read articleGot a pest problem? Get a free quote today.
Tell us what you're dealing with and get a free, honest quote over the phone. No inspection fee, no obligation. Same-day service in most cases, free re-service if pests come back, and every visit backed by our 100% satisfaction guarantee.