Large structures have pitched roofs, the establishment of a method has long been expected by which we can control snow sliding on the roof and make the snow slide down, smoothly.
In this study we aim at establishing a method of presuming snow sliding on the roof and making the snow slide down smoothly. We observed partial snow slides on real roofs in Kucchan, Hokkaido. Then we analysed the results and made an indoor, experimental study on partial snow sliding by using model snow.
As a result, it became clear that partial snow sliding tends to occur easily either when the temperature of the part on the roof is lower than others or when there is much snow drift on the ridge. The pitch of the roof, the roofing material and the shape of the roof have much to do with the condition of partial snow sliding.

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