Since 1967 a voluntary supervision scheme for vacuum-pressure treatment was established in Denmark. In 1976 the Nordic Wood Preservation Council - NWPC - established a scheme based on wood preservation classes for treated timber as a joint technical standard valid in Denmark, Finland, Norway and Sweden. This paper deals with inspection results over 17 years for CCA treatment within our organization. The practical implications related to the calculation of S.N.R. are dealt with such as salt gradients and variation in the actual oven dry weight for the calculation of average results. Operators instructions are required in order to meet the standard and such are indicated in the paper.

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