A bathroom remodel is one of the most exciting projects for any homeowner, but without proper waterproofing, that dream bathroom can turn into a nightmare. As contractors, we’ve seen what happens when waterproofing is overlooked—water damage, mold, and costly repairs. With the right materials, you can avoid these issues and create a bathroom that’s both beautiful and built to last. Here’s a rundown of the best waterproofing materials to consider for your project.

Why Waterproofing Matters in a Bathroom Remodel

Bathrooms are the wettest areas in a house, with constant exposure to water and humidity. Without effective waterproofing, water can seep into floors, walls, and even structural elements, leading to rot and mold. Investing in the right materials not only protects your home but also ensures your bathroom remains a clean, safe space for years.

1. Waterproofing Membranes

What They Are

Waterproofing membranes, both roll-on and sheet types, are a must-have for preventing water leaks. These create a barrier that stops water from penetrating walls and floors.

Where to Use Them

We always recommend applying membranes in high-moisture areas like showers, tub surrounds, and bathroom floors.

Pro Tip: One of my clients thought their tiled shower alone would block water. Unfortunately, without a waterproof membrane underneath, they ended up with water damage in the ceiling below. A simple membrane could have saved them thousands.

2. Backer Boards for Tile

Why Use Them

Regular drywall won’t cut it in wet zones. Cement backer boards or foam boards provide a waterproof base for your tiles and prevent water damage over time.

Where They Work

These are perfect for shower walls, floors, and anywhere tiles will be installed.

Contractor Insight: Many homeowners want to cut costs by sticking with regular drywall in a bathroom. Trust me, using waterproof backer boards is one area you don’t want to skimp on—it’s a small investment that protects the entire remodel.

3. Waterproof Paints

What They Do

Waterproof paints offer an extra layer of moisture resistance on walls and ceilings, especially in areas prone to high humidity.

Best Use

Perfect for ceilings or areas not directly exposed to water, like the walls above a sink.

Maintenance: These paints are easy to clean and help prevent mold growth, which is critical for long-term upkeep.

4. Epoxy Grout

Why It’s Essential

Unlike traditional grout, epoxy grout is waterproof and stain-resistant. It won’t absorb water, making it perfect for showers and wet areas.

Where to Use It

Between tiles in showers, on floors, and around tubs.

Pro Tip: Grout might seem like a small detail, but using epoxy grout can make all the difference in keeping your tiles looking great and your bathroom dry.

5. Tile Sealants

Purpose

Even waterproof tiles need protection. Sealants help prevent water from seeping through grout lines and tiles.

How to Use

Apply a tile sealant after installation and reapply every few years for ongoing protection.

Added Bonus: Sealants also make cleaning easier by preventing dirt and grime from getting into the grout.

6. Liquid Waterproofing Compounds

How They Work

These compounds are applied like paint to create a seamless waterproof barrier. They’re great for tricky areas like corners and niches.

Applications

Ideal for shower floors, walls, and other areas where water tends to collect.

Quick Tip: These are especially helpful in custom shower builds where standard sheet membranes might not fit perfectly.

7. Vapor Barriers

What They Prevent

Vapor barriers stop moisture from penetrating walls and floors, preventing mold and mildew growth.

Where to Install

Behind walls and under flooring in high-humidity bathrooms.

Contractor Tip: Pair vapor barriers with proper ventilation for the best results. A well-sealed bathroom without ventilation can still trap humidity.

8. Mold-Resistant Drywall

Why It’s Different

Mold-resistant drywall is specially designed to hold up in damp environments, making it a better choice than traditional drywall in bathrooms.

Best Use

Behind sinks and toilets or other areas not directly exposed to water.

Alternative: Use cement boards in direct wet zones for the ultimate waterproof setup.

9. Flexible Sealants and Caulking

Importance

Sealants fill in joints and gaps, keeping water from seeping into cracks and corners.

Where to Apply

Around tubs, sinks, and the edges of shower enclosures.

Pro Advice: Always use mold-resistant caulk for longer-lasting results, and check it annually for cracks or wear.

10. Drainage Systems

Purpose

Proper drainage prevents pooling and ensures water flows efficiently to the drain.

Examples

Linear drains, traditional shower drains, and pre-sloped pans.

Integration: Work with your waterproofing membrane and flooring to ensure a seamless, watertight system.

Final Thoughts on Bathroom Waterproofing

Waterproofing is not just a step in the remodeling process—it’s the foundation of a successful bathroom remodel. Skipping or cutting corners on waterproofing materials can lead to long-term damage and costly repairs. By choosing the right materials, you’re investing in the durability and longevity of your new bathroom.

Call the Pros at Next Horizon Renovations

At Next Horizon Renovations, we understand the importance of getting waterproofing right. From high-quality materials to expert installation, our team ensures your bathroom remodel is built to last. Whether you’re starting a full renovation or simply upgrading your bathroom, we’ve got the experience to handle it all.

If you need help with your bathroom remodel, give us a call at 704-389-5324. Let’s make your dream bathroom a reality—without the worry of water damage. 

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