Root Barriers

Root barrier membranes can be used as a means to prevent the spread of Japanese Knotweed onto neighbouring land. The effectiveness of the membrane is determined by good installation, therefore, it is essential that a specialist contractor such as JBB Knotweed Solutions is involved to undertake the task. A failure to halt Japanese Knotweed from spreading onto neighbouring property could result in legal proceedings. Installing a root barrier membrane could be an effective means of control where complete removal is not possible or desired.

Root barriers are essentially available in two forms: Non-permeable and Permeable. Non-permeable barriers are made of a reinforced impenetrable membrane which deflects the growth of Japanese Knotweed rhizomes. They are most commonly used as a vertical barrier to stop the encroachment of Japanese Knotweed onto neighbouring land. The membrane is installed from the surface down to a depth of 2-3 meters. Our experienced teams will dig a trench near to the boundary line to be protected and position the barrier at a 45-degree angle forcing root growth downwards instead of across.

Permeable root barrier membranes are primarily used following excavations and are ideal for roads and footpaths. This woven fabric is usually installed horizontally to a minimum depth of 500mm and allows water penetration whilst preventing damage to tarmac etc from invasive weeds such as Field Horsetail.

Permeable root barriers are often used for horizontal applications where water drainage is required. They can be used to suppress Japanese Knotweed regrowth in the ground where the full depth of an infestation has not been removed.

Root barriers installed by JBB Knotweed Solutions have a 100-year lifespan and will provide effective control provided it is not damaged or punctured. We will record the location, dimensions and depth of installed barriers to reduce any risk of accidental damage.

Japanese Knotweed Services

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Herbicide Treatment

Herbicide treatment involves the application of herbicide chemicals to the green foliage (leaves) using a backpack or handheld sprayer. It is suitable for both large and small areas, causing minimal disruption and inconvenience. The process of herbicide treatment is gradual and can take between 2-5 years to complete (longer for severe infestations).
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Stem Injection & Leaf Application

Stem Injection provides a targeted treatment using concentrated doses of herbicide which are injected directly into the plant’s stems using specialised equipment. The herbicide is drawn down through the stem and penetrates deep into the rhizomes where it kills the plant. This method of control is particularly advantageous due to its lower environmental impact.

5. Excavation with offsite disposal (main image)

Excavation and Off-Site
Disposal

Land contaminated with Japanese Knotweed can prove troublesome to developers and construction firms whose projects may be hindered until the knotweed is dealt with. Homeowners looking to build an extension or have their garden landscaped may require an immediate solution.

6. Excavation with onsite treatment

Excavation and On-Site
Treatment

On sites where additional space is available, excavated waste can be stockpiled in a segregated area where its presence will not pose any threat to surrounding structures or be at risk of spreading. A suitable management plan can then be put in place to treat the Japanese Knotweed with herbicide over a period of 2-5 years.

Book A Survey

We can tell you if you definitely have Japanese

Knotweed on your property and recommend the

best course of action.

We can tell you if you definitely have Japanese Knotweed on your property and recommend the best course of action.