Tile On Top Of Tile In Shower: DIY Guide & Tips

So, you’re thinking about tackling a bathroom refresh, and the idea of laying tile on top of tile in shower has crossed your mind? Smart move! Many homeowners discover that existing tile, especially when properly prepared with a degreaser, can be a solid foundation for new shower tile. Remember, preparation is key. Schluter Systems, for example, recommends careful inspection of the existing substrate because their products, although top-notch, require a stable base. You may also want to consult Tom Silva from *This Old House*, as his expertise often highlights the importance of proper thin-set mortar selection to ensure strong adhesion when you are dealing with such a project. With the right approach and a little elbow grease, you can avoid a messy demolition and give your shower a brand-new look.

Tiling Over Existing Shower Tile: Your Step-by-Step Guide

So, you’re thinking about giving your shower a fresh, new look without the mess and hassle of ripping out all that old tile? You’re in the right place! Tiling over existing tile – especially in a shower – can be a fantastic DIY project that saves you time, money, and a whole lot of demolition dust. But, like any home improvement endeavor, success hinges on doing it right. This guide will walk you through the best way to approach tiling over existing tile in your shower, ensuring a beautiful and long-lasting result.

First, we need to clarify what we mean by "best." It’s not always the easiest or fastest method. It’s the one that prioritizes waterproofing and prevents future headaches like loose tiles or mold.

Is Tiling Over Tile Right for Your Shower?

Before we dive into the how-to, let’s make sure this project is suitable for your situation. Answer these key questions honestly:

• Is the existing tile solid? Tap on the old tiles. Do you hear any hollow sounds? Hollow tiles indicate they’re not properly bonded and will need to be removed. You can’t build a strong foundation on a weak base. If more than 20% are hollow, consider ripping it all out.
• Is the existing surface level? Minor imperfections are okay, but significant bumps or dips will need to be addressed. We will discuss leveling techniques later.
• Is there existing mold or water damage? If so, you’ll need to address the root cause before even thinking about tiling over the old stuff. Otherwise, you’re just trapping the problem and it will resurface (pun intended!).
• Will tiling over tile affect drain height or shower door closure? Account for the added thickness of the new tile layer and how it might impact surrounding fixtures.

If you answered "yes" to any of the above questions, proceed with caution. Tiling over tile may not be the best option, or it may require additional steps.

The Preparation Stage: Setting the Foundation for Success

This is where the real magic happens. Proper preparation is arguably more important than the actual tiling. Don’t skip these steps:

1. Clean Everything Thoroughly: Use a strong cleaner (trisodium phosphate, or TSP, works great) to scrub away soap scum, mildew, and grime. Rinse well and let it dry completely.
2. Scuff the Surface: This crucial step creates a "key" for the new adhesive to grip onto. You can use coarse-grit sandpaper (60-80 grit) or a specialized tile scrubber. The goal is to create a rough texture without damaging the existing tile. Wear a mask!
3. Repair Damage: Fill any cracks or chips in the existing tile with tile repair caulk or epoxy. Let it dry completely according to the manufacturer’s instructions.
4. Leveling Imperfections: For minor unevenness, use a self-leveling compound designed for tile. Apply it to the affected areas, following the product instructions carefully. For more significant dips, consider using a thin-set mortar to build up the low spots. Allow these to cure fully before proceeding.
5. Waterproof Check: Ensure the existing grout lines are in good condition and there are no cracks where water could penetrate. Recaulk, if needed. Consider applying a liquid waterproofing membrane to the existing tile surface as an extra layer of protection, especially around corners and the shower pan joint.
6. Protect Fixtures: Cover your showerhead, drain, and other fixtures with painter’s tape or plastic sheeting to protect them from mortar and grout.

Choosing the Right Materials: A Recipe for a Lasting Finish

The right materials are essential for a successful "tile on top of tile" project. Here’s what you’ll need:

• Thin-set Mortar: Use a high-quality, polymer-modified thin-set mortar specifically designed for tiling over non-porous surfaces. Check the product description for compatibility with existing tile (usually ceramic or porcelain) and intended use for showers. An epoxy-modified thin set will offer best durability.
• Grout: Choose a waterproof grout suitable for shower applications. Epoxy grout is a great option due to its superior water resistance and stain-proofing properties.
• Sealer: Seal the grout lines after installation with a high-quality grout sealer. This will help prevent water penetration and staining.
• Tiles: Opt for tiles that are relatively lightweight to minimize the added stress on the existing structure. Consider using smaller tiles, which are more flexible and conform better to slight imperfections in the underlying surface.

Tiling Time: Applying the New Tiles

Now for the fun part! But remember, patience and precision are key.

1. Dry Layout: Before applying any mortar, lay out the tiles to plan your design and ensure proper spacing. Adjust as needed to avoid awkward cuts or narrow slivers of tile. Pay attention to corners and edges.
2. Apply Thin-set Mortar: Using a notched trowel, apply a thin, even layer of thin-set mortar to a small section of the wall (about 2-3 square feet). The size of the notch on your trowel depends on the size and type of tile you are using. Refer to the thin-set manufacturer’s instructions for guidance.
3. Set the Tiles: Press the tiles firmly into the mortar, using a slight twisting motion to ensure good adhesion. Use tile spacers to maintain consistent grout lines.
4. Continue Tiling: Work your way across the wall, section by section, until all the tiles are in place.
5. Cut Tiles as Needed: Use a wet saw to cut tiles to fit around fixtures and corners.
6. Allow to Cure: Let the thin-set mortar cure for at least 24-48 hours, or according to the manufacturer’s instructions.

Grouting and Sealing: Finishing Touches

Once the mortar is fully cured, it’s time to grout and seal the tiles.

1. Remove Spacers: Remove all tile spacers.
2. Apply Grout: Use a grout float to apply grout to the tile surface, working it into the grout lines at a 45-degree angle.
3. Remove Excess Grout: After a few minutes, use a damp sponge to wipe away excess grout from the tile surface. Rinse the sponge frequently.
4. Final Cleaning: Once the grout has dried slightly (usually 30-60 minutes), use a clean, dry cloth to buff the tile surface and remove any remaining grout haze.
5. Allow to Cure: Let the grout cure for at least 72 hours, or according to the manufacturer’s instructions.
6. Seal the Grout: Apply a high-quality grout sealer to the grout lines to protect them from water penetration and staining. Follow the manufacturer’s instructions for application.

Troubleshooting Common Problems

Here is a table outlining some common challenges that may happen in process, the causes and possible solutions:

Problem	Possible Cause	Solution
Tiles not sticking	Inadequate preparation of existing tile; wrong thin-set mortar; dry conditions	Ensure proper cleaning and scouring of old tile, use a premium modified thin-set
Grout cracking	Excessive movement in substrate, improper grout mix, or inadequate curing time	Ensure a proper substrate and use a premium modified grout with proper curing procedures.
Water leaks	Improper sealing, cracks in grout, or lack of waterproofing	Remove and re-seal with quality sealant; patch grout; or apply liquid membrane

Additional Tips and Tricks

• Invest in quality tools: Good tools will make the job easier and produce better results.
• Work in small sections: This will prevent the thin-set mortar from drying out before you can set the tiles.
• Take your time: Rushing the process can lead to mistakes that will be difficult to fix.
• Read the instructions carefully: Always follow the manufacturer’s instructions for all materials.
• Watch videos: There are many helpful videos online that can demonstrate the tiling process.
• Don’t be afraid to ask for help: If you’re unsure about any aspect of the project, consult a professional.
• Maintain the finish: It’s important to maintain the finish by performing regular cleaning of tile surface and re-sealing the grout lines for long-term durability

With careful planning, proper preparation, and the right materials, you can successfully tile over existing tile in your shower and create a beautiful, waterproof space.

So, there you have it! Tiling on top of tile in your shower might seem daunting, but with the right prep and a little elbow grease, it’s totally achievable. Just take your time, double-check those measurements, and soon you’ll be enjoying a fresh, updated shower space. Happy tiling!