(One Hundred Questions on Waterproofing) #37 New Construction Projects: Applying a wiping-type waterproofing system (including general two-fluid PU, super-fast curing PU, oily rubberized asphalt, etc.) for waterproofing projects. In order to expedite the work, the water accumulates in low-lying areas on the roof and is drained away using a gas spray gun. After drying it with the spray gun, construction is immediately started; are there any aftereffects to be expected? How can they be overcome?

Answer:

如此施工極容易使防水材在施工一個月內即發生鼓起、附著不良、龜裂、水解等現象。因爲滲入結構體內的水份無法在短時間內藉由瓦斯烘乾而全部蒸發完畢(大部份僅是表面乾燥而已)。所以千萬不要爲了趕工而草率施工,在瓦斯烘乾的部位必須耐心再等2~4小時以上的自然乾燥期,使整個屋面結構的含水率達到可以施作的情況(ㄧ般夏天要在8%以下,冬天要在10%以下,而且最好是利用專用濕度測試儀器,不要憑著肉眼的感覺來判斷)才可塗裝防水材。

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