2014年1月20日月曜日

昔の屋根瓦は雪が積もりやすい (Roof Tiles of Earlier Ages Are More Ready to Accumulate Snow)


 昨朝、当地・堺でも雪がちらついた。積もるほどではなかったが、なんとかしてせっかくの雪降りの記録写真を撮りたいと思って、わが家の二階の方々の窓から眺めると、上掲の写真のように、右隣の家の屋根にだけ、瓦のくぼみに雪がたまっていた。写真でも分るように、その向こうや、さらにその向こうの家の屋根にはほとんどたまっていない。

 何が違うかといえば、右隣の家だけが約 50 年、建て替えをしていない。これで見ると、昔の屋根瓦は雪が積もりやすい、つまり、断熱性が優れていたようだ。新しい屋根瓦、そしてスレート屋根などは、軽くなって、耐震面ではよいのだろうが、保温・遮熱では劣るのではないだろうか。


Yesterday morning, it snowed lightly here Sakai. It was not so much as to pile up, but I wanted to take the photo of snowy scenery and looked out from different windows of the second floor of my house. Then, I found that snow had accumulated only on the roof of my next door at the right as shown in the picture above. The photo also shows that snow is little accumulated on the roofs of the two houses beyond the next door.

What is different about the next door compared with other houses is that they did not rebuilt their house for about 50 years. Considering from this, we can say that roof tiles of earlier ages is more ready to accumulate snow. Namely, heat insulation of those tiles seems to be better than new ones. While the light weight of new tiles and of the slate roof is good from the viewpoint of resistance against earthquake, but they might be inferior in thermal insulation.

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