Knotweed control with root barriers

Root barrier membranes are used to prevent the spread of Japanese knotweed where full removal is not possible or where added protection is required. They can prevent encroachment across boundaries and protect surfaces such as asphalt, driveways and roads.

Vertical root barriers

Vertical barriers are typically installed along boundaries to prevent knotweed spreading to or from neighbouring land. They are usually installed to a depth of two to three metres, depending on the known depth of the rhizome system.

The installation process involves:

Excavating a trench with a mechanical excavator
Positioning the root barrier membrane vertically, as close to the boundary as practical
Backfilling the trench with suitable fill material
Taking care throughout to avoid damage to the membrane

Vertical barriers are a practical option where excavation is not feasible along a boundary line or where neighbouring land contains knotweed that cannot be removed.

Horizontal root barriers

Horizontal root barriers are installed to protect specific surfaces where complete rhizome removal is not possible. They are often used beneath:

roadways
drives and paths
car parks
hardstanding areas

Horizontal membranes prevent upward rhizome growth but may encourage lateral spread. For this reason, a sacrificial zone is usually created at the edge of the membrane so that any emerging shoots can be treated with herbicide.

When root barriers are used

Root barriers are typically used alongside wider knotweed removal methods to provide additional protection and minimise the risk of regrowth in critical areas. They are not a standalone removal solution but form part of an overall management strategy. For tailored advice or to discuss whether a root barrier is suitable for your site, please contact our team.

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