Lap-joint trails (following European Standard EN 12037) were set up with 11 different softwood and hardwood species. Half of the number of the lap-joint specimens were coated with an alkyd coating. The moisture development has been followed during a 19 months period. In this paper, the out comes of different moisture contents evaluations are presented. The results show, that the moisture content of the lap-joints is predominantly influenced by the wood species. Some wood species with a low water absorbing ability don't reach moisture content levels which allow fungal decay. By applying a coating to the lap-joints, all species get wet enough for longer periods (8-10 months) in the year.

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