The purpose of the thesis was to assess and determine the condition of cross-laminated timber panels and dowel-laminated panels after seven years of exposure to conditions corresponding to the third exposure class, as defined by SIST EN 335. Before the exposure, one of the cross-laminated panels was treated with a wax preparation, while the other was treated with Silvanolin. During the exposure period, moisture levels in the panels were measured to correlate decay with moisture levels above 25%, which is necessary for wood decay.. After the exposure, samples were cut from the panels for visual, microscopic, and hyperspectral analysis, as well as for testing compression and shear strength, and for determining copper content in the outer layers. The moisture measurements indicated that decay could occur, which was confirmed through visual analysis. The decay was minimal, mostly occurring in the lower and upper parts of the panels and at the spot where the measuring box was attached, allowing water to seep behind it. No decay was found in the middle part of the panels.
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