天面防水工程可分為起底重做或不起底新做防水層
對於一些比較舊的大廈因石屎層已太舊不建議重新起底做法 , 因炮鑿時會產生結構問題
不起底新做防水層平宜, 起貨快, 環保等優點
環保免起底天面新加防水隔熱層:

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新做天面防水隔熱結構圖:

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