The present invention relates to silo covers comprising at least two layers,whereinan inner first layer facing the silo is a single- or multi-ply plastic filmhaving oxygenpermeability according to DIN 53380-3 at 23 °C and 50 % relativehumidity of nomore than 500 cm3 / (m2 d bar) and a water vapor transmission rate accordingtoISO 15106-3 at 23 °C and 85 % relative humidity of at least 5 g / (m2d), and in atleast one ply in total contains at least 50 % by weight of one or morematerialsfrom the group comprising polyamide, copolyamide, polyester, copolyester,polyethylene vinyl alcohol, polyvinyl alcohol and mixtures thereof, and atleast onesecond layer, which is located on top of the inner layer and is separate fromtheinner layer, or easy to separate therefrom, or self-separating on the silo,composed of at least 70 % by weight of materials from the group comprisingpolyethylene, polypropylene, copolymers of ethylene and other vinyl monomers,and copolymers made of propylene and other vinyl monomers.
