EVA stands for ethyl vinyl acetate. It is a copolymer with a random distribution. A copolymer is obtained when at least two different monomer units are combined in the polymer chain. With a random distribution, the different monomer units are randomly arranged in the polymer chain. EVA is a type of plastic film used as a plastic roofing film. Plastic roof films (ECB, EVA and PVC) are used as an alternative to bituminous roofing.