The heat treatment of wood is an environment-friendly method for wood preservation. This process improves wood’s resistance to decay and its dimensional stability. However, mechanical properties decrease in different ration because of density loss as a result of heat treatment. In this study, the effect of heat treatment on water absorption and dimensional stability at different relative humidity of Anatolian Chestnut (Castanea sativa Mill.) was investigated. Wood specimens conditioned at 65% relative humidity and 20oC temperature were subjected to heat treatment at 180°C for 2, 4, 6, 8 and 12 hours. After heat treatment, water absorption and dimensional stability were determined. The results show that water absorption and dimensional stability were occurred, decreasing in variation ration in relate with density loss. After heat treatment, water absorption and dimensional stability were decreased with increasing temperature and duration.

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