Being the largest wet area in the house, it is always advised to waterproof each and every corner of the bathroom. The floor is the most exposed surface, whereas walls opposite to shower are also wet up to a particular height. Usually, bathroom waterproofing solutions need to be applied at every corner and even on the side walls up to 3fts cm from the floor. If you notice the dampness on the other side of the wall, you can cover respective areas with Nerolac Perma Super 2K