First of all, shovel off the white ash wall, re-plaster with cement mortar, and then lay the white grey tiles, because directly laying the white grey tiles on the wall is not very firm, and there may be problems such as falling bricks in the later stage.
Paste white grey tiles directly on the wall. First, wetting the wall and brushing a layer of cement mortar. Mixing an appropriate amount of building glue into the cement mortar can prevent the cement mortar from drying too quickly. The tiling steps to complete the wall renovation.
The second situation is that if the white ash on the wall has been pulverized and fallen off, the white ash on the wall should be cleaned up, and it is best to rinse it with water to be more thorough, and then just follow the normal process of laying white grey tiles.
When tiling tiles, you must be clear that wall tiles and floor tiles are different and cannot be confused. Some people will replace floor tiles with wall tiles, but because of different water absorption, wear resistance, and price, do not mix them.