There are two types of termite barriers.
1) Physical Barrier
Physical barrier is usually installed during the construction of a new building. There are a few products in the market for the installation of this kind of barriers. One of the most popular ones is Kordon from BAYER. It looks like a thick orange plastic that we install Under slab, between the cavity walls, around the penetration and through the gaps where termites maybe finding their way inside a home undetected. The material has got insecticide built into it, so any termites come in contact with it will die instantly. It lasts many decade if installed correctly and it will reduce the chance of termite infestation significantly.
The other product is termimesh. It is made of stainless steel so termites cannot chew through it. The advantage of termimesh is that there are no insecticides involved. It is a simple physical barrier providing protection against any termite penetration.
Granitgard is also another physical termite barrier where there are no insecticides involved. It is made of a sandy looking material where termites cannot penetrate as the sands are too small for them to tunnel through. They cannot move them either as the product is too heavy for them to carry or move.
Physical Barrier involves in preventing undetected termite entries by blocking their path into your home. As mentioned before physical barriers are generally installed during the construction of a building.
2) Chemical Barrier
As the name implies, Chemical barrier involves mixing the soil with chemicals insecticides or termicides do termites will get infected when they come in touch with them. It is an ideal barrier for existing homes and it can protect homes against termites for up to 10 years depending on the product and the concentration.
There are two types of chemicals used When applying termite barriers.
Repellent chemicals are cheaper and more toxic to other animals than the non repellent ones. As soon as termites come in contact with them, they will sense the poison and die. Other termites will then avoid that area. If a barrier is laid perfectly, then termites cannot penetrate it. Sometimes gaps appear in some barriers. If that is the case, termites maybe able to overpass the barrier and enter your home.
Non repellent chemicals are more expensive but less toxic to other animals including humans. They also have a delayed affect properties. If termites come in contact with them, they will not notice any poison and as a result of delayed affect, they will have time to pass the poison to the other members of the colony. Even if there are some gaps in the termite barrier zone, chances are that termites encounter the treated area sooner or later. This is why always make use of non repellent chemical when it comes to installing a barrier.
If your home is built on a slab, Perimeter barrier is the preferred method of termite protection. Best Pest Control Melbourne drill 4 holes per meter and inject chemicals under the slab. In some area where trenching is applicable, we flood the trench and put the soil back.
Some homes are built on brick piers and usually there is an access to the subfloor. In these cases Subfloor chemical treatment is an ideal termite barrier against subterranean termites.
And finally we sometimes install termite barriers in homes with both subfloor and an extension on slab. In that case the combination of the subfloor termite barrier and perimeter barrier is the best way to protect homes against subterranean termites.