美国的玻纤瓦重量要求很轻是因为他们的屋顶主要是木质的。
American shingles are lighter because their roofs are mainly in wood.
在混凝土屋面，钉子抗拔力的大小尤其重要，因为钉子必须保证玻纤瓦固定在屋面上而不被风刮走。
It is important especially for installation on concrete roofs, because the nail must hold onto the concrete and guarantee that the shingles will not blow away.
在混凝土屋面，钉子抗拔力的大小尤其重要，因为钉子必须保证玻纤瓦固定在屋面上而不被风刮走。
It is important especially for installation on concrete roofs, because the nail must hold onto the concrete and guarantee that the shingles will not blow away.
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