Japanese Knotweed Barriers
One option to confine or prevent Japanese knotweed spreading onto or from a neighbouring property would be to install a specialist root barrier.
The root barrier consists of a membrane which must be installed vertically along the boundary to a depth of not less than two metres. In order for this method of control to be effective the barrier must surround the stand or neighbouring property.
Specialist membranes can also be installed horizontally to prevent knotweed growing up into sub-bases, or as an ‘in-situ capping’ operation, where the top growth and top layer of rhizomes are removed and the remaining rhizomes kept in place but ‘capped off’ with suitable membrane to prevent further growth.