Preservation of historical and cultural heritage architecture requires information on the condition of building material. In case of construction timber, wood is a natural material and, if not preserved in time, subject to biological and physical decomposition. Timber constructions have to be inspected in order to evaluate stability and safety. To prevent unnecessary wood damages, the Resistograph F300-S was used to evaluate the quality of timber. The Resistograph F300 S is an instrument used for detecting and measuring cracks, voids, and decay in different stages in the invisible inside of a structure. Micro drillings made by a small drilling needle for measuring the drill resistance reveal the relative density distribution of wood. In the present paper, construction timber and joints of different wood species were examined. Micro drills with the Resistograph F300-S were taken from different joints. Additionally, some examples of micro drills in wooden beams under different conditions, compared with the corresponding saw-cut, will be given. The results show a good agreement between the recorded data and the condition of the examined timber. Invisible Decay and hollow spaces in structures could be detected. The Resistograph F300-S will provide a good understanding and impression of the current condition of the inspected timber.
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