Japanese knotweed is a non-native, invasive species that can contaminate land and endanger structures. The stems of the plant grow aggressively. If Japanese knotweed gets into a neighbouring property, you could be held liable. Not only can this notorious plant make your property unsellable, but it can also cause issues with remortgaging. 

You should prevent Japanese knotweed from spreading by contacting an experienced contractor. Japanese Knotweed Contractors have a range of weaponry within their arsenal to deal with your problem, including Japanese Knotweed barrier membrane. 

What is a Japanese Knotweed Barrier Membrane? 

A root barrier is a physical membrane that helps protect structures and stop knotweed encroachment. It is usually combined with other techniques such as excavation, herbicidal treatments, screening and sifting to ensure the plant does not spread any further. 

The performance of the Japanese knotweed barrier membrane depends on a fit for purpose barrier being supplied and proper installation. This is a skilled task that requires expert fitting to redirect the spreading roots whilst limiting their extension. 

For best results, be sure to hire a Japanese knotweed specialist to ensure that a quality, fit for purpose barrier is supplied and installed correctly. 

How Does a Japanese Knotweed Root Barrier Work? 

A Japanese Knotweed barrier is typically made from polyethylene and provides a minimum lifespan of 50 years, once buried. The barrier’s prime function is to physically block the path of Japanese Knotweed. 

There are many Japanese Knotweed and Root barrier membranes available on the market, however, it is important to choose a barrier that has demonstrable performance history via laboratory testing and field experience. 

Typically, the barrier should have been tested for root and light penetration to internationally accepted test methods. It should be CE Certified, have a minimum of 50 years lifespan, and have at least a 5-year field performance history. 

When installing a Japanese knotweed barrier, it is key to consider how deep the membrane should extend beyond viable knotweed rhizomes. For vertical and cell burial applications the barrier should be placed at a minimum of 2m depth. 

Where Can You Use Japanese Knotweed Barrier Membrane?

Vertical installations – Knotweed encroachment can be prevented by laying a Japanese knotweed barrier around the perimeter of a treated or infected area, such as property boundaries. 

Horizontal / Capping installations – By installing a root barrier over a treated / infected area, for example within the foundation footprint of a new build, Japanese knotweed penetration can be prevented. 

Cell Burial – Subject to availability of space – Cells can be excavated on site and lined with a suitable barrier membrane, once filled the cell barrier is then jointed to the ‘lid’ barrier providing total encapsulation of the buried Japanese Knotweed contaminated soils. 

If you are having a Japanese knotweed problem and are looking for an effective root barrier solution, get in touch with us and we will be happy to help you find the best solution when it comes to protecting your property

Take a look at our Gallery page where we share some excellent photos about supplying and installing this type of root barrier for some of our clients. Call 01307 461 499 to speak to our experienced staff.