How to fix the tile?

The foundation and wall foundation is the key. First, find the level, so that the tiles are not hollow! If you want to stick the big board firmly, the tile glue is necessary. The tile glue has liquid and solid. The tile glue must be applied evenly on the base layer and the back of the tile. Because tile adhesive is a polymer-modified cement-based interface treatment material, it can improve the bonding strength between the tile and the tile adhesive.