This study was carried out in order to make the Pest Control Operators able to achieve correct treatments and enhance their efficacy. It was carried out in two steps: 1) in laboratory, to learn the influence of various parameters like spraying pressure, use of repeated applications, distance from nozzle to wood; 2) in situ on roof timber of five buildings. In this case, the applications of the preservatives were carried out by different Pest Control Operators according to their usual habits. For the treatment application, several factors like the precise evaluation of the treated timber, the amount of preservatives actually applied, ambient temperature, spraying pressure, distance of the operator from wood were observed. Chemical analyses were made on different samples cut off at different places. It is possible to conclude that, if the application is carefully carried out, in both cases, whatever the preservatives used, and the conditions of application, the amount of preservatives found into the wood, is generally higher than 100 g/m².

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