Certain modern coatings have been held responsible for the rot damages in wood sidings, which have, during the past few years, appeared at an increasing extent in Scandinavia and which have occurred rather soon after the application of the coating. In this study, the moisture excluding effect of different coating systems intended for sidings have been studied with the help of an X-ray technique, computed tomography. The coatings used in this study were laboratory-made and according to recipes approved by the paint manufactures. The paper presents pictures of the moisture distribution that clearly visualize the accumulation of moisture at the wood/coating interface and around defects in the panels.

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