Japan has extremely limited natural resources. Therefore, it is necessary to build a circular economy in which waste and other recyclable resources are effectively utilized in order to achieve sustainable development. This study aims to investigate the degradation of existing wooden houses and to contribute to the reuse of existing houses and the reuse of building materials during demolition. We investigated the extent to which the pressure-treated foundations with wood preservative and termite control agents undergo aging in actual properties. As a result of the investigation, the collected samples showed that the areas treated with pressure-injected wood preservative and termite control agents did not exhibit decay or termite damage. No correlation could be confirmed for the degree of infiltration and absorption of preservative chemicals when there was decay damage in the surrounding environment. For ant damage, the infiltration degree was about 80%, and for absorption, the values for the surrounding environment became greater after about 3kg/㎥. However, only two properties had ant damage, so it is impossible to say exactly which criteria are related to ant damage. If there are places where termites can attack, they will enter from there and nibble at the wood. However, areas where preservative and termiticidal chemicals are present are not attacked. We believe that three things are important for reusing existing housing and recycling materials. The first is that the construction must be done properly. Second, the foundation must be treated with a preservative and termiticide in accordance with regulations. Third, preservative and antiseptic measures must be taken.

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