geotextile

geotekstiili Any strong, permeable fabric used in earthwork earthworks for any of a number of purposes, including separation of soil layers, filtering, reinforcing, erosion protection and protection of drainage pipes from clogging.
(quote-journal) (Property)|date=24 August 2014|passage=You need to excavate and remove the topsoil, line the subsoil with a geotextile, then lay and compact hardcore.