最終更新日：2025/11/24
According to ASTM E 1918-97, we specified a steep-slope roof for the new building, meaning the roof's uppermost part would be installed at a slope of 2:12 (9.5 degrees) or more.
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According to ASTM E 1918-97, we specified a steep-slope roof for the new building, meaning the roof's uppermost part would be installed at a slope of 2:12 (9.5 degrees) or more.
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