Underlay wrap - for better silage
The underlay wrap is also called suction or sealing foil. The foil clings to any unevenness on the silo surface due to its minimal thickness and very soft falling characteristics. This ensure better protection against air and thus creates better conditions for the silage process.
The underlay wrap furthermore reduces the intrusion of water in case of damage, e.g. due to birds or free-ranging animals.