屋顶上的冰坝和冰柱(视频）
前几天，多伦多地区遭遇暴雪和严寒的袭击，之后有很多人打电话或微信我：陈博士，我家的屋檐上有很多的冰柱，这是 …
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Can metal roofing last forever?
Metal roofing can last up to 40 years or much longer, depending on the materials and the environment. But is there any the short boards for metal roofing?
