In the wet surface of the base construction, positive side and backsurface can be the construction.
在潮湿基面上施工，迎水面和背水面均可施工。
2
There is an easy to ignore but must be reminded that the backsurface of the water, which is mainly aimed at the building near the external walls of the unit users.
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。
3
Back home, things appear, on the surface, simpler.