What a chemical barrier is
A chemical termite barrier is a continuous treated zone of soil around and beneath your building. Termites approaching the structure have to pass through it, and when they do, they pick up the termiticide.
The word continuous is doing a lot of work in that sentence. Termites need a gap of only a few millimetres. A barrier that covers most of the perimeter is not a barrier, it is a suggestion. That is why the installation matters far more than the brand on the drum.
How we install it
Every property is different, but the work usually involves three things. We trench around the external perimeter of the building and treat the soil as it is backfilled. Where the perimeter is covered by concrete, paving or tiles, we drill at close intervals and inject beneath the slab so the treated zone continues underneath. Where there is a subfloor, we treat internal piers and walls as well.
Penetrations are where most barriers fail. Pipes, conduits, expansion joints and slab edges are exactly the concealed paths termites use to get inside without ever showing themselves, so those areas get particular attention.
Drill holes through hard surfaces are patched and made good. It is rarely invisible, but it should be tidy, and we will show you what it is going to look like before we start rather than after.
Modern termiticides and how they work
The products used today are non-repellent. Termites cannot detect them, so they move through the treated soil as they normally would, pick up the termiticide, and carry it back on their bodies. It is then transferred to other termites through contact and grooming.
That is a meaningful improvement on older repellent chemistry, which termites could sense and simply route around, hunting for the one gap in the barrier. A non-repellent product turns the foragers into the delivery mechanism, so the effect reaches back beyond the individual termites that crossed the zone.
Every product is applied strictly in accordance with its approved label. In South Australia that is not just best practice, it is a legal requirement, and we record the details of every application as part of the job.
How long it lasts
The expected service life depends on the product used, your soil type and conditions on the property. It is stated on the product's registered label, and we will tell you what it is for your specific installation and put it in writing rather than quoting you a number from an advertisement.
A barrier is not permanent and it is not maintenance-free. Soil gets disturbed, gardens get dug, paving gets laid, extensions get built, and any of those can breach a treated zone without anyone realising.
This is why annual inspections matter. They are how a breach gets found before termites do, and on most treatments they are a condition of keeping the warranty valid. Skip them and you may still have a barrier, but you almost certainly no longer have a warranty.
What you get from us
A full inspection first, so the treatment is designed around what is actually happening at your property.
Installation carried out to AS 3660.2, the Australian Standard for termite management in and around existing buildings.
A written report covering what was treated, which product was used, and where.
A durable notice fixed at the property recording the treatment and when the next inspection is due.
A reminder when that inspection comes around, so the warranty does not lapse because it slipped your mind.
Barrier or baiting?
A chemical barrier gives you protection from the day it goes in and generally costs less up front. It does require trenching and drilling, and it puts termiticide in the soil around your home.
A baiting system such as Exterra involves no trenching or drilling and targets the colony rather than the perimeter, but it works over a longer timeframe and depends on ongoing monitoring.
Which one suits your property depends on the construction, the access, the soil, and what you are trying to achieve. Call us for a free site assessment and we will give you a straight answer, including when the answer is that you do not need what you thought you needed.
