基层必须基本干燥，一般在基层表面均匀泛白无明显水印时，才能进行防水层的

The base layer must be basically dry. Generally, the waterproof layer can be constructed only when the base layer surface is evenly whitened and there is no obvious watermark. The dust on the base layer surface must be cleaned before construction.

The grass-roots must be basically dry, generally in the grass-roots surface uniform whitening without obvious watermark, in order to carry out waterproof layer construction, before construction to clean the grass-roots surface dust.

The base course must be basically dry. Generally, the construction of waterproof layer can only be carried out when the base course surface is even and white without obvious watermark. The dust on the base course surface should be cleaned before construction.<br>