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卷材屋面上为什么要撒一层绿豆沙

更新时间: 2020-06-29 00:00:00     

绿豆砂是直径3mm左右的碎石。用的最多的地方是沥清类防水层和坡道面层。用于防水层的做法是炒热后均匀撒在防水层上然后压入防水层内,可以有效防止防水层热涨冷缩造成开裂。用于坡道也是面层,起防滑作用。卷材屋面上撒一层绿豆沙是防止夏天的时候屋面温度过高而引起沥青熔化随屋面坡度流动,绿豆砂能有效阻止沥青流动。

关键词: 屋面 为什么 豆沙

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