If your home, property or land is at constant risk of infestation of invasive weeds despite your best efforts, maybe a neighbour is untraceable, the invasive species is very difficult to control, or for a number of reasons there is a risk posed. A root barrier can prevent that risk and keep any invasive species out for good or ensure it is contained to an area where it can be further dealt with.

Our root barriers are made specifically for Japanese Knotweed, and while knotweed will tend to grow through almost anything where it can or where it finds a breach, even tarmac or concrete, our root barrier will stop it in its tracks.

What is a root barrier?

A root barrier, also known as a root control barrier or root barrier membrane, is a physical barrier installed underground to prevent the spread of roots from invasive plants or trees. These barriers are typically made from materials such as high-density polyethylene (HDPE), fiberglass, or other durable plastics.

The primary purpose of a root barrier is to restrict the movement of plant roots, particularly those of invasive species or trees known for aggressive root growth, such as bamboo, Japanese Knotweed, or certain types of trees like willows and poplars. By installing a root barrier vertically into the soil, it creates a barrier that roots cannot penetrate, thus preventing them from encroaching into areas where they are unwanted, such as building foundations, sidewalks, driveways, or underground utilities.

Root barriers are commonly used in landscaping and construction projects to protect structures and infrastructure from damage caused by invasive root systems. They can be installed during initial construction or retrofitted into existing landscapes. Proper installation involves burying the barrier to the appropriate depth and ensuring a secure seal to prevent roots from bypassing the barrier.

Overall, root barriers are an effective tool for managing and containing plant roots, helping to prevent costly damage to structures and landscapes.

Using a root barrier for Japanese Knotweed

A Japanese Knotweed Root Barrier is a physical barrier designed to prevent the spread of Japanese Knotweed (scientific name: Fallopia japonica) roots. Japanese Knotweed is an invasive plant species that can cause significant damage to buildings, infrastructure, and ecosystems. Its roots are particularly resilient and can penetrate through various materials, including concrete and asphalt.

The root barrier typically consists of a thick, durable membrane made of materials such as high-density polyethylene (HDPE) or reinforced plastics. It is installed underground around the perimeter of an area where Japanese Knotweed is present or likely to spread. The barrier acts as a barrier to the roots, preventing them from spreading horizontally and vertically beyond the enclosed area.

Installing a Japanese Knotweed Root Barrier can be an effective method for containing the spread of the plant and preventing damage to structures and landscapes. However, it’s important to note that it’s usually just one component of a comprehensive Japanese Knotweed management plan, which may also include a Thermo-Electric eradication treatment, the excavation, and disposal of contaminated soil, among other measures.

Japanese Knotweed Identification

Get a Free No Obligation Japanese Knotweed Identification service today. Find out if you have Japanese Knotweed or not on or around your property.

How to identify Japanese Knotweed

Use our Japanese Knotweed seasonal gallery to help you identify Japanese Knotweed in the UK throughout the season and see how we can help you.


Types of Root Barriers available
In the UK there are a variety of root barriers are available to manage invasive plants and protect structures from root damage. Some common types of root barriers available in the UK include:

HDPE (High-Density Polyethylene) Root Barriers
HDPE root barriers are widely used due to their durability, flexibility, and resistance to degradation from soil chemicals and moisture. They come in various thicknesses and widths to suit different applications and are suitable for containing invasive plants like Japanese Knotweed.

Geotextile Root Barriers
Geotextile root barriers consist of woven or non-woven synthetic fabrics and provide a permeable option for root control. While not as effective at physically blocking roots as solid barriers, they can still provide some guidance and protection. Geotextile barriers are often used in landscaping applications and are available in the UK.

Rubber Root Barriers
Rubber root barriers are made from recycled rubber materials and offer flexibility and resilience. They can effectively block root penetration and are environmentally friendly. Rubber barriers are commonly used in landscaping projects in the UK.

Concrete Root Barriers
Concrete root barriers provide robust protection against root penetration and are suitable for heavy-duty applications. They are typically precast or poured in place and are commonly used around building foundations or underground utilities in the UK.

Fiberglass Root Barriers
Fiberglass root barriers are constructed from woven fiberglass fabric impregnated with resin, offering excellent strength and durability. They are suitable for containing aggressive root systems and can be used in various landscaping and construction projects in the UK.

Metal Root Barriers
Metal root barriers, such as stainless steel or aluminum, provide durable protection against root penetration. They are commonly used in industrial settings or areas with high soil pressure where other types of barriers may not withstand the conditions effectively.
The choice of root barrier will depend on factors such as the type of invasive plants or trees, soil conditions, depth of installation, and intended application. Consulting with Knotweed.net can help you to determine the most suitable type of root barrier for specific needs.

Cost of root barrier installation
The cost of root barriers can vary depending on several factors, including the type of barrier, the size and depth of the area to be protected, labor costs for installation, and any additional materials or equipment that maybe required. Here’s a general overview of the costs associated with root barriers:

Root Barrier cost
The first thing to consider is that of the root barrier itself as well as the thickness, width, and length of the barrier needed. If a specialised composite root barrier, root director, or permeable root barrier is necessary, the cost of the barrier may increase. For enhanced protection, additional expenses may arise.

Labor Cost
Labor costs for installing root barriers will depend on factors such as the complexity of the installation, site accessibility, soil conditions, and the expertise of the installer. Labor costs can vary widely but may include digger hire, excavation, preparation of the site, installation of the barrier, backfilling, and site restoration. Labor costs can often match or exceed the material costs.

Additional Costs
Additional costs may include equipment rental (such as excavation equipment), transportation of materials to the site, permits or permissions required for installation, and any landscaping or restoration work needed after installation.

Maintenance Costs
While root barriers are typically low maintenance once installed, there may be occasional inspection or maintenance costs associated with ensuring the barrier remains intact and functional over time.

Enquire about a root barrier today.
Japanese Knotweed Agency and their nationwide partners are experts in installing root barriers to stop the spread of Japanese Knotweed. However, root barrier systems can also provide a solution to regain land that has been overtaken by less invasive plant species, such as Himalayan Balsam. Whatever the situation, we can provide a solution.

We listen to all our clients’ circumstances, assess the location, and then specify and design a root barrier solution that is tailored to their needs. This root barrier service is available throughout the UK and is backed by Japanese Knotweed Agency accredited invasive Japanese Knotweed eradication services. Call 03335 777 999 and talk to one of our consultants today.