A multi-layer film comprising a layer (a) and a layer (c), each layer comprising at least one propylene copolymer in a quantity of at least 30% by weight and at least one propylene homopolymer in a quantity of at least 20% by weight, in each case relative to the total quantity of the layer (a) or (c), at least one inner layer (b) based on at least one homo- and/or co-polyamide having isophorondiamine units as polyamide components, and further comprising adhesion promoter layers (d) and (e) arranged between the layers (a) and (b) and between the layers (b) and (c), respectively, each adhesion promoting layer being based on at least one modified thermoplastic olefin homopolymer or olefin copolymer; a sealing sheet comprising such a multi-layer film, and the use of such a multi-layer film for covering roofs.