What is a termite reticulation system?
A termite reticulation system is a network of underground pipes installed around the perimeter of a building that holds a liquid termiticide. Unlike a conventional soil treatment that is applied once, a reticulation system is designed to be replenished: the termiticide can be topped up through the pipework years later, restoring the protective zone without tearing up the ground or drilling through the slab. In practical terms it turns a one-off chemical barrier into a renewable one.
The system has a few key parts. Flexible lines run through the soil around the footings and under paths or paving, fitted with emitters that let the chemical seep out evenly. These connect back to fill points, and on modern systems to junction boxes, where a technician attaches a pump to recharge the lines. As long as there is access to those fill points and clear soil around the perimeter, the whole zone can be refreshed without excavation.
How termite reticulation systems work?
Protection depends on two things: even distribution and the right chemical.
When we replenish a system, the termiticide is pumped through the lines at a controlled pressure so it disperses uniformly into the soil and forms a continuous treated zone around the structure. The pressure matters. Too little and the chemical never reaches the far corners; a blockage or a crack and it pools in one section while the rest of the home is left open. That is why a proper refill is a measured, tested process rather than simply attaching a pump and running product through.
The chemistry matters just as much. A system should be charged with a non-repellent termiticide approved by the APVMA, such as Termidor. Non-repellents are undetectable to termites, so they move through the treated soil, pick up the active ingredient, and carry it back through the colony as they share food and groom one another. That transfer effect is what makes a modern barrier work. Older repellent chemicals do the opposite: termites sense them and simply track around or under the treated zone, which is a key reason so many early systems gave a false sense of security.
Where reticulation systems are used?
A reticulated system can be installed during new home construction or added during renovations such as an extension, a deck, or a granny flat. It is most often specified in two situations: a new build where the owner wants a renewable barrier from day one, and a renovation where a new concrete slab is poured against an existing one.
That second case is important. Under the Australian Standard for termite management, AS 3660, a replenishable termite barrier is expected where new and old foundations meet, because that join is a classic concealed entry point. We lay a reticulation line beneath the slab at the join and connect it so the zone can be maintained for the life of the structure, rather than being sealed in and impossible to renew. Getting this right at construction stage is far cheaper and simpler than retrofitting protection later, which usually means drilling.
Why so many old reticulation systems fail?
This is the part most homeowners are never told, and it is the single most important thing to understand before you rely on an existing system.
In our experience, 60 to 70 percent of older termite reticulation systems fail during a pump-up. There are several reasons, and they often stack up together:
- Brittle and cracked pipework. Years underground, exposed to soil movement, heat and tree roots, leave older lines brittle. The moment they are put under pump pressure, they split, and the chemical escapes at the break instead of reaching the rest of the perimeter.
- Broken or failed fittings. Early systems used plastic bends to turn corners, held with clips. When the clips fail the lines pop off. Some installers substituted hose clamps, but once the pipe goes brittle the clamp simply causes it to bend and snap.
- Blockages and root intrusion. Soil, silt and fine roots work their way into emitters and lines over time, so even an intact pipe may not disperse product evenly.
- Defunct installers. Many of the companies that installed these systems years ago have gone out of business, so there are no records of the layout, the fill points, or what chemical was originally used.
- The wrong chemical. A large number of older systems were charged with a repellent product that only deters termites. As above, termites simply go around repellents, so even a system that pumps up perfectly may never have offered real protection.
When we attempt to pump the full volume around a home and the system fails, the termiticide reaches only one section, leaving the rest of the house exposed while the owner believes they are completely protected. That gap between perceived and actual protection is exactly how homes with a reticulation system still end up with active termites.
What happens during a professional pump-up?
A refill should never be a blind operation. Our technicians inspect every corner of a reticulation system before and during the pump-up, watching how the product behaves as it goes in.
If we detect flooding, backflow or a section that will not hold pressure, we stop. Pushing on regardless would charge one part of the perimeter and leave the rest dry, which is worse than doing nothing because the owner then trusts a barrier that is not there. We test the soil to confirm the chemical is actually reaching where it should. On a recent job we were called to replenish an existing system and, on testing, found the product had only reached one corner of the house. Without that check, the homeowner would have carried on believing the whole home was protected. Where a system can no longer hold proper pressure or has failed in multiple places, the honest answer is to replace it, not to pretend a refill has solved the problem.
Pre-construction barriers: what can go wrong
Most new-build reticulation systems are installed before the slab is poured, usually by a sub-contractor the builder briefs in. This is where a surprising number of long-term problems are created.
Our main concern is that the person laying the line does not need a full termite licence to do so. It can be done after a short course, sometimes with inferior products, by someone who may never see the site again. Builders themselves are often unaware of how the systems work, and that contributes to failures too. We have attended sites where the pipes were buried under rubble or rocks, so the chemical physically cannot disperse into the soil as intended. We have seen L-shaped corner bends secured poorly, and lines that popped off because a clip failed or a hose clamp crushed a brittle pipe. None of this is visible once the slab is down and the landscaping is in, which is why problems only surface years later at the first pump-up.
If you are building or extending, it is worth insisting on a licensed, reputable installer and keeping the paperwork, including the treatment certificate and the durable notice that should be fixed in the meter box recording what was installed and when.
Modern reticulation upgrades
Reticulation systems are not commonly installed as the first choice anymore, but we are regularly called to replenish or replace them, and the newer systems are far more reliable than the early designs.
One we use now is Termex. It does away with the fragile plastic corner bends, because the lines come in 10 metre lengths with a junction box on each end. That means both ends of every line are visible and accessible when we pump, so we can see the product flow through and confirm the whole line is charged. There is no hidden corner to burst, and no guesswork about whether the far end of a run actually received any chemical. For a homeowner, that visibility is the difference between hoping a system worked and knowing it did.
Reticulation, barrier or baiting: which protection suits your home?
A reticulation system is one of several ways to protect a home, and the best option depends on how the building is constructed and what access the site allows.
- A full chemical termite barrier treats the soil around and under the structure and suits most standard construction.
- A reticulation system makes sense where you want that chemical zone to be renewable without re-drilling, particularly around slabs and renovation joins.
- A termite bait system works differently again, intercepting and eliminating foraging termites across the yard, and it suits raised, split-level or pole homes where a continuous soil barrier is hard to achieve. It also doubles as an early-warning monitoring system.
Many homes end up using a combination, for example a barrier or reticulation zone for the structure and baiting for early detection across the garden. There is no single right answer, and the surest way to know what fits your home is a termite inspection, after which we can recommend an approach suited to your property and budget rather than selling you a system you may not need.
Reticulation and renovations in South East Queensland
Our warm, humid climate keeps termites active for much of the year, and activity climbs after wet spring weather, so a renewable barrier is a sensible layer of protection for homes across Brisbane, the Gold Coast, Logan and Tweed Heads. It matters most during renovations and extensions. A new slab poured against an old one is exactly the kind of concealed junction termites exploit, and it is where the Australian Standard calls for a replenishable barrier. If you are adding to your home, factoring reticulation in at construction stage is far simpler than retrofitting protection afterwards.
Need a reticulation refill or inspection?
If you are planning major renovations, or your reticulation system has not been checked in years, do not assume it is still doing its job. The majority we test are not. Pest-Ex has protected more than 14,000 homes across South East Queensland and Northern NSW since 2006, and we are a Rentokil company. Book a termite inspection or contact us for a free on-site quote, and we will test your system and tell you honestly whether it can be refilled or should be replaced, then recommend the right termite treatment if it is needed.
Frequently asked questions
What is a termite reticulation system?
It is a network of underground pipes installed around a home that holds a termiticide. The chemical can be topped up over time to maintain a protective treated zone around the structure, usually without drilling through concrete, which is what makes it a renewable barrier rather than a one-off treatment.
How do termite reticulation systems work?
Termiticide is pumped through the pipes at a controlled pressure so it disperses evenly into the soil and forms a continuous treated zone around the home. A non-repellent product is used, so termites pass through the zone, pick up the active ingredient and carry it back to the colony rather than avoiding the treated soil.
How often does a reticulation system need refilling?
It depends on the product used and the conditions on site, but every system needs periodic replenishment to stay effective. Just as important, it should be inspected and pressure-tested before any refill, because a system that cannot hold pressure cannot be relied on no matter how much product is pumped in.
Can you DIY a termite reticulation system?
No. Installing and charging a system requires licensed handling of termiticide, the correct equipment and the right pressure, and any gap in coverage leaves an entry point while you believe you are protected. It is not a job that can be done safely or reliably with hardware-store parts.
Why do old reticulation systems fail?
Pipes go brittle and crack, fittings break, blockages and roots interfere with dispersal, and many older systems were charged with repellent chemicals that termites simply bypass. A large share fail the moment they are put under pump pressure, which is why testing before a refill is essential.
How do I know if my existing system still works?
You cannot tell from the surface. The only way to know is to have it inspected and tested, ideally by a licensed technician who will check pressure and confirm the chemical is reaching every section rather than pooling in one spot.
Reticulation or a bait system: which is better?
Neither is universally better; they do different jobs. A reticulation system maintains a chemical zone around the structure, while a bait system adds early detection and colony elimination across the yard. An inspection will show which suits your home, and some properties benefit from both.
Do I need reticulation if I am renovating?
Often yes. Where a new slab is poured against an existing one, the Australian Standard calls for a replenishable barrier at the join, because that junction is a common concealed entry point. Building it in during construction is far easier than retrofitting later.
