Ten different samples from Slovenian hardware stores were analysed. Samples were treated with copper based wood preservatives and designed and advertised to be used in heavy duty applications in use classes 3.2 or 4. In order to determine the quality of the treatment penetration, retention and fungicidal properties were determined. Retention was determined with XRF analysis, while modified EN 113 procedure was applied for assessment of fungicidal properties. For durability testing two brown rot fungal species, Gloeophyllum trabeum and Fibroporia vaillantii, were used. The results of the analysis clearly showed that only three of the inspected wood products meets penetration requirements, but none of them had sufficient retention, what reflects in insufficient durability against wood decay fungi as well.

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