Abstract
The purpose of this study is to understand and to predict the influence of snow sliding down from sloped roof on necessary distance from a bottom of roof to boundary line of lot in a region of heavy snowfall. Therefore it is necessary to get basic data to calculate the range within snow sliding down from slopped roof. Then we observed and measured the state of snow sliding down from sloped roof. The results tell it necessity to take care as is shown below, when calculating the range within snow sliding down from slopped roof. 1) In the case of step roofing with sheet-metal, it is important to estimate the velocity of snow sliding down with much care. 2) It is necessary to take the velocity of snow sliding down into account, then to set the coefficient of friction (=μk) to an appropriate value for calculating. According to this survy, it is advisable to set μk to a value less than 0.1.
