The paper presents measurement results of moisture content and the analysis of durability trial of double layer wood in variants of varying size, conducted in Girionys, Kaunas distr., Lithuania and in Hamburg, Germany. In this trial 3 sample sets of varying size, containing 25, 50 and 100 specimens, are used. The aim of this trial is to ascertain an optimal number of test specimens. The dynamics of wood moisture content and its defectiveness are estimated. The results showed, that maximum moisture content of Lithuanian trials was increasing with increasing number of specimens in one test set up. Lowest moisture content was recorded in single layer tests. The specimen remained mostly sound after half a year of outdoor exposure. Slight damage caused by basidiomycetes has been ascertained only in 5 out of 187 specimens. However mycelium growth was found on 64% of specimens. The mycelium was growing on 75-85% of lower layer samples and on 42-54% of upper layer samples in the double layer test. During the trials a newly developed stroke test proved to be promising for objective assessment of degree of decay. It will be further developed.

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