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Knotweed control with root barriers
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.
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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
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