In the winter in 2012, the low temperature since 1984 continued and 210 cm snow was seen. When observing the performance of four kinds of roofs of the natural snow melting method of construction in it, the result like the following could be confirmed.①As for the maximum snow-load about the snow period, the ground met in 838kg/㎡ whereas 360-480kg/㎡ met.②Average drippig quantity of water about the continuous snow cover period was 8.87 - 9.77 kg / (㎡･day).③The melting away of snow of the roof of the natural snow melting method of construction, it became early on the 18-33 day compared with the ground.④It is because the cavity formed under the pipe in the freezing period, too, and the condensation moved ahead that the snow melting was progressional.⑤The performance of the 45 ° roof of the jungle gym type model was the best for the inside in the form of four kinds.
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