Heavy-duty membrane set upright to keep rhizome on its own side.
Free photo ID check · Mon–Fri 8am–6pm, Sat mornings
A barrier is a strong membrane placed vertically in a trench along a boundary or around a structure. It suits sites where the stand lies over a wall or fence and cannot be treated from your side, or where new building work needs protecting. It stops rhizome getting across the line, but the stand itself still needs treating.
A barrier is most useful when the stand is on the other side of a boundary and you want to protect your garden, or when a stand cannot be removed straight away. It works best along a defined line such as a fence, wall or driveway edge. It is less helpful where the rhizome already lies on both sides. The surveyor checks the line, the likely depth and any obstacles before suggesting it. A barrier slows spread; it does not remove the plant.
A trench is dug along the agreed line, usually deeper than most garden digging goes, and the heavy-duty sheet is set upright with joints overlapped and sealed. The top edge is left slightly above ground and the soil is replaced. Tree roots, old foundations, drains and buried rubble often get in the way, which can slow the job. Gardens built on made ground, brick rubble or fill, which is common around former works and canal land, can be harder to trench cleanly.
Check along the line each season for canes appearing on your side or pushing over the top. Do not dig up or tear the membrane when planting or fixing fence posts. Keep paving and soil heights from covering the exposed edge. A barrier is often paired with spraying on the knotweed side if the owner agrees. Keep the plan, photographs and installation record, since a buyer will want to know exactly where the membrane is and how it was fitted.
A leaf and a length of stem, through the form or by message. Free.
For a confirmed knotweed stand, we visit, measure it and record what sits nearby.
Spraying across a few seasons, or digging it out when the date matters.
A written plan for your files and your lender, plus follow-ups until regrowth stops.
Every job starts with a free photo check. If a visit is needed, you get a written quote before any work starts — no obligation, no surprises.
Northwich town centre· Hartford· Davenham· Barnton· Winnington· Greenbank· Leftwich· Castle· Wincham and Lostock Gralam· Weaverham and Rudheath
Knotweed survey We visit, confirm the plant, measure it and write up what we find. 
Free knotweed ID from a photo Send a picture and we say what it is. No charge. Knotweed plan for mortgages and sales The management plan lenders and buyers' solicitors ask to see. 
Knotweed from a neighbour A dated record of where the stand is and which way it is heading. Knotweed spraying programme Herbicide applied through the growing season, over several years. Knotweed excavation Removing the stand and its rhizome in a matter of days. 
Knotweed on development land Surveys and removal for Northwich building sites. Knotweed for landlords Surveys and treatment for rented houses and flats. 