How to Fix a Loose Pebble Shower Floor

Pebble shower floors bring a spa-like feel into the bathroom. The small stones create a natural, textured look and feel comfortable under your feet. But after a few years of daily use, you may notice some pebbles becoming loose, wobbly, or even popping out. Not only does this look uneven, but it can also allow water to seep underneath, leading to bigger issues like mold or damaged subflooring.

The good news is that fixing loose pebbles doesn’t always require a full renovation or a call to a contractor. With a few simple tools, some patience, and the right steps, you can restore your shower floor and keep it strong for years to come.

Why Pebbles Come Loose

Pebble floors are beautiful but have more grout lines than traditional tile, which makes them slightly higher maintenance. Some common reasons for loose pebbles include:

Worn-out sealer: When the protective sealer wears away, water seeps into the grout and weakens the adhesive.
Normal wear and tear: Daily use, cleaning, and water exposure slowly erode grout and mortar.
Poor installation: If the installer didn’t use enough thinset mortar or applied grout unevenly, stones may not hold long-term.
Harsh cleaning products: Acidic or abrasive cleaners can eat away at grout and loosen the pebbles.

Tools and Materials You’ll Need

Replacement pebbles (if some are missing or cracked)
Thinset mortar or tile adhesive
Grout (in a color that matches the existing one)
Grout float or small putty knife
Sponge and a bucket of water
Clean rags or towels
Stone and grout sealer
Small brush or applicator for the sealer

Step-by-Step Guide

Step 1: Remove Loose Pebbles and Old Adhesive
Carefully pull out any loose stones. Use a putty knife to scrape away old grout or mortar from the surface. Make sure the area is completely clean and dry before applying new adhesive.

Step 2: Apply New Adhesive
Spread a thin, even layer of thinset mortar or tile adhesive in the empty spots. Don’t overdo it—too much adhesive can push up between the stones.

Step 3: Replace the Pebbles
Press the stones firmly into the adhesive, making sure they sit level with the surrounding ones. If you’re adding new stones, try to match the size and color so the repair blends in.

Step 4: Allow Adhesive to Dry
Check the instructions on your mortar or adhesive. Most products need 12–24 hours to set properly before grouting.

Step 5: Re-Grout the Area
Once dry, mix your grout and use a grout float or putty knife to push it between the stones. Fill every gap to prevent water from sneaking under the floor.

Step 6: Clean Excess Grout
Wipe the pebbles with a damp sponge to remove extra grout. Rinse the sponge often to keep the stones clean. Let the grout cure for 24 hours.

Step 7: Seal the Floor
After the grout is fully cured, apply a stone and grout sealer. This is a critical step—it locks out water, prevents staining, and helps the repair last longer. Spread the sealer evenly with a small brush or cloth, then let it dry.

Tips for Long-Lasting Results

Reseal your pebble shower floor every 1–2 years.
Use mild, stone-safe cleaners instead of harsh chemicals.
Avoid stiff scrub brushes that can loosen grout.
Keep the shower floor dry when not in use if possible.

Pros and Cons of a Pebble Shower Floor

Pros:

Spa-like, natural look
Comfortable underfoot with a massage-like feel
Non-slip surface, safer than smooth tiles
Adds unique character to the bathroom

Cons:

Requires regular sealing and care
More grout lines = more cleaning
Pebbles may come loose without proper maintenance
Repairs can take time and patience

How Much Does It Cost to Fix a Pebble Shower Floor?

If you’re repairing just a few loose stones, the cost is not too high. Here’s a breakdown of average 2025 costs in the U.S.:

Option	What’s Included	Estimated Cost (2025)	Notes
DIY Repair	Thinset mortar ($10–$20), grout ($10–$15), sealer ($15–$25), optional replacement pebbles ($10–$20)	$30–$60 (plus $10–$20 if you need extra stones)	Most affordable, requires time and patience
Professional Repair	Labor + materials (adhesive, grout, sealer, stones)	$150–$400	Cost depends on repair size, local labor rates, and material quality

These estimates are ballpark figures for 2025 in the U.S. market. Prices may vary based on: