How to Waterproof a Bathroom the Right Way

Most bathroom failures come from water behind the tile. Here is how a properly waterproofed shower is built.

Slope the floor to the drain

A shower floor needs a consistent slope toward the drain. A pre-sloped base or a mud bed gives water a clear path.

Use a continuous waterproofing system

A sheet membrane or liquid membrane covers the floor, curb and walls with sealed seams and corners. Niches and benches get the same care, because every opening is a potential leak.

Test before you tile

A flood test holds water in the pan for a period to prove there are no leaks. It is a simple step that prevents expensive problems.

Ventilate and seal

A properly sized exhaust fan removes moisture, and flexible caulk at changes of plane keeps grout lines from cracking.