When we talk about wood-based composites, we mean products made from fiber, chipboard, veneer, or lamellas, and compressed with glue under high pressure and high temperature. Wood composites differ from massive wood in better dimensional stability, flatness, and homogeneity. Due to their good mechanical properties, wood composites are not only used in the furniture industry but also in civil engineering (roofing, walls, and floors) under changing climate conditions. Because of silver supporting construction, the panel systems of prefabricated construction developed. The latter is a leading worldwide system of building one or two-storey wooden prefabricated houses. We were interested in how long-term exposure of cyclic climate with high relative humidity influences the most prominent mechanical properties of various wood composite panels. We exposed the chosen panels to different conditions: cyclic and external conditions, submergence. The results showed that the mechanical properties of the panels are most negatively affected by changing conditions, the bend strength and modulus of elasticity are influenced by the orientation of the building blocks in the panel. Particle board P2 achieved the worst results, and the best construction particle board P5.
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