The aim of this thesis was to determine the effectiveness of synthetic oils in protecting wood against fungi. We investigated the fungicidal properties of paraffin and silicone oils through experiments conducted in accordance with the EN 113 and EN 84 standards, exposing samples to the fungi Gloeophyllum trabeum and Poria monticola. Norway spruce Picea abies samples were vacuum–pressure impregnated; half were subjected to leaching according to EN 84, after which culture media were prepared and the samples exposed to fungal activity. The samples were exposed to the fungi for 16 weeks. We also assessed oil penetration using hyperspectral imaging, as well as resistance to blue-stain fungi and moisture, by exposing spruce CLT samples to weathering conditions. The CLT samples were coated with the oils using a brush and left outdoors for 48 hours to dry. They were then exposed outdoors on a specially designed rack. Moisture monitoring sensors were also attached to the wood. The test results indicate that the oils are not suitable as fungicidal agents, except in the case of samples containing added copper carbonate exposed to Gloeophyllum trabeum. Hyperspectral imaging revealed significant variation in penetration. Moisture monitoring showed that copper carbonate had a beneficial effect, as it reduced the moisture content of the middle layer.
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