A tile shower can become the centerpiece of your bathroom—but without proper waterproofing, it can turn into a costly problem. Unlike acrylic or fiberglass surrounds, tile and grout are not waterproof. That makes the waterproofing system behind the tile just as important as the tile itself.
This guide explains why waterproofing matters, compares popular systems like Schluter® and others, and shows what you need to build a long-lasting, leak-free shower.
Why Waterproofing Matters in a Tile Shower
Tile is water-resistant—not waterproof. Moisture eventually passes through grout lines, cracks, and corners. Without a waterproofing layer underneath, that water will:
- Cause mold and mildew behind the walls
- Rot framing and subfloors
- Loosen tile and cause delamination
- Lead to expensive repairs and potential health issues
A proper waterproofing system stops moisture before it reaches the structure of your home, creating a continuous, reliable barrier.
Popular Shower Waterproofing Systems
🟧 Schluter®-KERDI System
Type: Sheet membrane
How it works: Install sheets over wallboard and shower floors using thin-set mortar, then seal seams with KERDI-BAND.
Benefits:
- Lightweight and easy to handle
- Creates a seamless waterproof layer
- Works with Schluter’s shower trays and drains
Best For: Custom walk-in and curbless showers with tiled floors.
🟨 Wedi® Building Panels
Type: Waterproof foam-core panels
How it works: Panels provide structure and waterproofing in one step.
Benefits:
- Naturally waterproof
- Strong, lightweight, and easy to cut
- Speeds up installation
Best For: Contractors and homeowners who want fast, reliable results with minimal prep.
🟩 LATICRETE HYDRO BAN®
Type: Liquid-applied membrane
How it works: Roll, brush, or spray on the liquid to form a flexible, waterproof coating.
Benefits:
- Ideal for complex shapes and tight corners
- Bonds directly to cement board
- Fast drying and crack-bridging
Best For: Remodels, unusual layouts, or sealing over existing surfaces.
🟦 RedGard® by Custom Building Products
Type: Liquid-applied membrane
How it works: Apply in multiple coats; it turns bright red when properly coated.
Benefits:
- Budget-friendly
- Easy to see coverage
- Mold- and mildew-resistant
Best For: Budget-conscious projects and smaller shower installations.
How a Waterproofing System Is Installed (Simplified)
- Prepare the substrate: Install cement board or another approved backing.
- Apply the membrane:
- Embed sheet membranes (like KERDI) in thin-set mortar, or
- Roll or brush liquid membranes (like Hydro Ban or RedGard) in multiple coats.
- Seal seams and corners: Use membrane bands, tapes, or overlaps.
- Integrate the drain: Connect the waterproofing system to a compatible shower drain.
- Install tile: Set tile directly onto the membrane using thin-set mortar.
What Happens Without Waterproofing?
Skipping waterproofing—or using the wrong system—leads to:
- Soggy drywall or rotted framing
- Black mold hidden inside the wall cavity
- Loose tile and failing grout
- Water damage to ceilings below the shower
Most homeowners discover the problem only after the damage becomes severe.
Tile Showers Last When Built the Right Way
A beautiful tile shower depends on more than high-end tile. The waterproofing system underneath protects your investment and ensures your shower lasts for decades.
Ready to Remodel Your Shower?
At Blue Ridge Build Co., we build tile showers that meet code and stand the test of time. We use industry-leading waterproofing systems—Schluter®, Wedi®, LATICRETE®, and more—to create durable, leak-proof results. Whether you want a luxury spa shower or a simple update, we’ll build it correctly from the inside out.
Schedule your free consultation today and get a detailed estimate tailored to your home and goals.