Reliability on the Non-destructive Inspection Method for the Humidity in Wooden Sheathed Walls

For minimizing the effects of housing deterioration, it must be established a simple and precise inspection to examine the house condition. In this study, the behavior of humidity in wooden sheathed wall of housing outer wall was considered. The humidity, which was observed in the walls, was compared with non-destructive inspection data, the temperature and the humidity observed inside and outside of the wall. Non-destructive inspection data was (cid:3) classified and inspected according to their observed position, their specification and environment. As a result, the boundary of the humidity in the wall, which has effect on the housing deterioration, was estimated from 64% to 67%. The reliability of non-destructive inspection method was indicated by Bayes method, therefore the humidity inspection with electrical resistance devices is more reliable than the inspection with high frequency devices. With the electrical resistance devices, the non-destructive inspection on lower position mortar wall is useful on the humidity inspection in wooden sheathed walls. The humidity in the wall is affected by the environment, specification and the observed position.