In recent years larch wood is more often used in building projects, as seen in building façades, terraces and balcony fences. In Slovenia, the use of the Siberian larch is especially popular. In this thesis, I decided to research the resilience of wood against moisture using the example of the Siberian larch (Larix sibirica) grown naturally and on plantations, as well as the European larch (Larix decidua). Along with larch, spruce wood processed to grey at an accelerated rate was also integrated into the research. Various tests relating to moisture absorption were made on samples of Siberian larch grown naturally and on plantations, European larch, ordinary spruce and treated spruce wood. Siberian larch grown on a plantation had the highest moisture content at conditioning in a chamber above distilled water. This means this sample reached equilibrium faster than the others used in a research. We found out that the two types of Siberian larch, natural and plantation, absorb moisture at the same rate after long exposure to water uptake. The final measurements showed that the plantation Siberian larch absorbs moisture the most and the European larch absorbs it the least. The results indicated that the plantation Siberian larch is more hydrophobic than the European larch and naturally grown Siberian larch. The wetting ability of the tested materials was examined with regard to the resistance dose, with European larch showing the highest resistance dose.
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