In the paper results from lab testing (ENV 807 and EN 113) are compared with field results (EN 252) of differently treated wood. Depending on the type of the organic biocide containing material and depending on type of soil and type of decay differences were found in suitability of the lab methods to predict field performance. The attempt is made to interpret the found differences. Furthermore it is examined to which extend the applied short term tests meet the general requirements for prediction of field performance and in service performance given by CIB/RILEM ISO TC 59. Based on the experimental results reported suggestions for possible adaptations of the currently used methods are discussed.

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