Wooden houses have a long tradition in several of the Nordic countries. Wood can be protected in various ways; constructional, chemically and by surface treatment. The use of various types of exterior paints as a surface treatment is a common way to prolong the durability of the wood. To further protect the painted surface against growth of fungi and algae, dry-film biocides remains an essential part of a high quality exterior paint. In Europe, the use of biocides is regulated by the Biocidal Products Regulation (BPR). Dry-film preservatives are just beginning to be evaluated, and already several of the well-known dry-film biocides face challenges with being approved under BPR. This paper will discuss the purpose of applying exterior paint(s), biological growth on painted facades, and the uncertain future of the dry-film biocides in Europe.

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