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Composites are building materials made from at least two different constituent materials that are fully bonded over the entire surface and cannot be separated manually. As a rule, they are difficult to reuse and often, only low-level disposal is possible. [Zwiener 2006]
Vapour barriers and wind barriers must consist of either renewable materials (e.g. paper) or a single type of plastic. Additives from other materials are admissible up to a maximum content of 10% w/w.
Alternatively, the corresponding baubook declaration may serve as evidence (www.baubook.info/oea).