在潮湿基面上施工，迎水面和背水面均可施工。
In the wet surface of the base construction, positive side and back surface can be the construction.
除了常用的迎水面防水技术之外，背水面防水则更为困难、在某些条件下甚至无其他方法可代替。
Besides usually adopted positive side water proofing technique, the negative side water proofing is a more difficult and unsubstitutional engineering measure under certain conditions.
还有一个大家容易忽视但又须分外提示的是背水面(屋顶)防水，这重要是针对靠近建筑外墙的单元的用户。
There is an easy to ignore but must be reminded that the back surface of the water, which is mainly aimed at the building near the external walls of the unit users.
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