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Cause hollow due to what?

Jiangxi Kinying Industrial Co.,Ltd | Updated: Dec 13, 2016

① Base plastering not processed according to the requirements of the wall (brick walls are not watering or too thick not hanging wire mesh in plastering, etc) or grass-roots garbage is not clean.

② ceramics tile spreading mortar when not full or tiles are not tapped extruding dense; paving tiles before the flooding or immersion is not enough;