Wood samples from a long-term field test are a valuable compendium of information about the material in the context of its aging processes. In the current work, wood samples from the round-robin test within the ECOMOD project were used as a material for the natural aging process (III and IV class of utility). The research scope was to determine selected properties of this wood which can be partially classified as a post-consumer (impregnated or modified) wood subject. The spectrum of the tests included determining resistance to decay, resistance to fire, and determination of the modulus of elasticity. Wood exposed to the field test method can be a valuable research material as a post-consumer wood product. CCA-treated wood, acetylated wood, and thermally modified wood were characterized by high resistance to the fungi, regardless of whether it was exposed to III or IV class of use conditions. Furfurylated wood was resistant to the fungal test when its modification level exceeded WPG 35.

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