Root barrier membranes are currently used in a number of ways: 1: Cell formation 2: Protecting structures and hard surfaces 3: Preventing horizontal spread 4: Protecting services, etc For all you need to know about Japanese Knotweed and Root barriers check out Managing Japanese knotweed on development sites (The knotweed Code of Practice) http://rootbarrier.com/downloads/Environment_Agency-Pages20-24-Dendro-Scott_Root_Barrier.pdf #JapaneseKnotweed #Knotweeddublin #Root #Barri