The bathroom area is exposed to water every day. If the bathroom is not waterproofed during the stage of construction, repairing a leaking bathroom is lengthy process and incurs huge costs. A bathroom or kitchen not waterproofed can ruin interiors, hassle residents, and incur significant repair costs in the future. t is essential that water used in bathrooms and kitchen is drained out only through the pipes. Yes, it is very much essential to waterproof the new house at construction phase only. You will be saved from post construction leakage issues, mental stress and the time & money.