There is not any doubt that the chemical protection of wood (besides the architectional-constructional wood protection) is of utmost importance for the increase of the durability of technically used timber. The toxic properties of wood preservatives make certain legal regulations necessary for the protection of human beings, animals and the environment. Thereby wood preservatives fall under the poison law, the food law and the waters protection law. An appropriate and reasonable application of these three laws can protect human beings and animals from injurious effects of wood preservatives. The absence of any legal obligation for compulsary examination of efficiency of wood preservatives against wood pests is a fault. It makes it impossible to eliminate products of low efficiency which nevertheless encumber the environment.

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