Historical stone buildings and traditional Japanese buildings suffer from frost damages in Historical Village of Hokkaido. In order to clarify the deterioration mechanism of stone and earthen walls, surface temperature and water content of the wall were measured at the set time intervals in addition to the climatic data. The surface conditions of the stone and earthen walls were observed periodically. The observation revealed that the south wall surface deteriorated severer than the wall facing other directions. The temperature measurement showed that the number of freeze and thaw cycles was larger at the south wall than at the other walls and this corresponded well with the observation. The field tests and laboratory experiments were also carried out to clarify the mechanism of frost damage of stone and earthen wall.
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