If you want to change,make flat range the floor tile of toilet, after authentic of will original floor tile goes, make the region with cement mortar first smooth, next redo prevents water treatment.

• 做平地面假如您要更换卫生间的地砖，在将原有地砖凿去之后，先用水泥砂浆将地面做平，然后再做防水处理。