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Water vapour diffusion resistance of solid wood panels and laminated veneer lumber panels The material composition of wood and adhesive is influenced by numerous factors during the bonding process, which is why the water vapour diffusion resistance (WVDR) of wood‐based panels is subject to a certain degree of variation. In this work, self and industrially produced panels were tested for their WVDR in dry and humid test climates. The tests show that the results are highly dependent on the corresponding adhesive system, the adhesive quantity and the board thickness. Additional evaluations of the adhesive joint formation using a microscope show a correlation between the WVDR and the thickness of the pure adhesive film. A comparison of the measured values with the information in the data sheets reveals a considerable difference. It can be concluded from this that in future the normative regulation for determining the WVDR for the product declaration should not be determined using list values, but rather measured for each product in accordance with standard EN ISO 12572. [ABSTRACT FROM AUTHOR]