The purpose of this study is to. examine the distribution of the Tsumairi and the Hirairi through the analysis of thatched house in Shiga prefecture. The result are as follows: (1) Tsumairi is distributed especially in northern area. (2) The north-south axis of roof and the south door are related to Tsumairi style. (3) Tsumairi is highly related to the weather conditions, especially snow which is much influenced from Lake Biwa. (4) The difference of the roof maintenance management between the northern area and the southern area is found. (5) The correlation with the custom in the heavy snow area and the distribution of Tsumairi area is identified.
