To decide the repairing and reinforcement method for wooden constructions, it is necessary to get the enough and precise information on the status of the construction beforehand, especially the distribution and the degree of the biodeterioration, such as decay or insect attack (e.g. termite attack). In this study, damage of biodeterioration to teak wood used in Indonesian traditional wooden construction of “Joglo” was investigated by evaluating ultrasonic velocity, moisture content, acoustic emission, and so on. Damages by dry-wood termite or fungi were found in joglo constructions in sultans’ palaces and in the area of Kotagete. The relationship of damages by dry-wood termite or fungi to ultrasonic velocity in the teak wood and to moisture content was discussed. The monitoring of acoustic emission generated by dry-wood termite attack was also carried out for the detection of termite attack in the wooden structure.

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