Importance of wood as building material is increasing. When we use it for construction purposes, we want to retain its mechanical properties as long as possible. Used outdoor, wood is exposed to wood deterioration agents; in ground contact its exposure is even more threatning. The researched wooden posts were applied in the ground at the playground in Ljubljana. Despite the fact that they were impregnated with a Cu preparation, they were completely degraded after 5 years. Their service life was thus comparable to service life of untreated wood. Wood posts were degraded by brown-rot fungi. 2 kinds of samples were prepared from investigated posts used for determination of Cu content and compressive strength. The results clearly show that wood posts were poorly impregnated. Mechanical properties degraded in quite short time.
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