The roofing system in lightweight steel structure is composed of roof truss, structural OSB panel, waterproof layer and lightweight roofing tile, which is also named metal or asphalt tile.
轻钢结构住宅屋面系统是由屋架、结构OS B面板、防水层、轻型屋面瓦，又为金属或沥青瓦，组成的。
But he points out that most roofs, whether tile or asphalt-shingle, have a life span of 20 to 25 years.
但他指出，无论是屋瓦还是基于沥青材料的盖屋板，多数的屋顶的生命周期都约为20- 25年。
But he points out that most roofs, whether tile or asphalt-shingle, have a life span of 20 to 25 years.
但他指出，无论是屋瓦还是基于沥青材料的盖屋板，多数的屋顶的生命周期都约为20- 25年。
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