How to fix loose pool tiles

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Introduction

Noticed pool tiles shifting underfoot or floating to the surface? You’re not alone. Learning how to fix loose pool tiles is an essential skill for keeping your swimming pool both safe and beautiful. In this step-by-step guide, we’ll walk you through the entire process—from identifying the cause to reattaching the tile—so you can get your pool looking perfect again.

Why Fixing Loose Pool Tiles Matters for Your Pool

Loose or missing pool tiles are more than just an eyesore—they’re often a warning sign of deeper issues like water leaks, shifting surfaces, or chemical imbalance. If left untreated, the problem can worsen and lead to:

  • Water damage behind the pool shell
  • Structural degradation due to moisture exposure
  • Injuries from sharp tile edges or bare concrete
  • More expensive repairs down the line

By fixing loose tiles promptly, you restore your pool’s appearance, prevent further damage, and keep swimmers safe.

Step-by-Step Guide to Fixing Loose Pool Tiles

Step 1: Identify the Problem Area

Start by locating all loose or missing tiles.

  • Gently tap surrounding tiles with a rubber mallet or knuckle. A hollow sound often indicates looseness.
  • Check for gaps, cracks, or bulging grout lines.
  • Remove any debris from the pool floor in case tiles have already fallen off.

Note the affected area and gather enough replacement tiles (if needed) before starting the repair.

Step 2: Drain the Water Below Tile Level

To perform tile repairs, the surface must be clean and dry.

  • Lower the pool water about 6–12 inches below the tile line.
  • Allow time for the wall to fully dry (typically a few hours in dry weather).
  • Use a towel or blower to speed up drying if needed.

⚠️ Caution: Avoid draining the entire pool unless absolutely necessary, as this can cause damage in some in-ground pools.

Step 3: Remove Loose or Damaged Tiles

Carefully detach any loose tiles from the surface.

  • Use a putty knife, chisel, or flathead screwdriver to pry off the tiles.
  • Remove all old thinset mortar and grout behind and around the area.
  • Clean the area thoroughly using a wire brush and rinse with clean water.

The surface should be free from dust, debris, and grease to ensure proper adhesion.

Step 4: Apply New Thinset Mortar

Use a waterproof, pool-safe thinset mortar to reattach the tiles.

  • Mix the mortar according to the manufacturer’s instructions.
  • Apply a thin, even layer to the back of the tile and the wall using a notched trowel.
  • Press the tile firmly into place and wiggle it slightly to ensure good adhesion.
  • Maintain even spacing between tiles using tile spacers if necessary.

Let the mortar set for at least 24 hours before proceeding to the next step.

Step 5: Regrout the Tile Joints

Once the thinset is cured, apply waterproof grout to seal the joints.

  • Use a grout float to press grout into the joints between tiles.
  • Wipe away excess with a damp sponge.
  • Allow the grout to dry for at least 24 hours.

Once cured, the grout will form a watertight seal to protect the area from moisture intrusion.

Step 6: Refill and Test

Now that the repair is complete:

  • Refill the pool to its normal water level.
  • Inspect the repaired area for any air pockets or discoloration.
  • Let the pool circulate for several hours, then inspect again.

Your tiles should be secure and look seamless with the surrounding surface.

Common Mistakes to Avoid

  1. Skipping Surface Prep
    • Mistake: Applying new tile over old mortar or wet surfaces.
    • Fix: Always clean and dry the area completely before adding adhesive.
  2. Using the Wrong Adhesive
    • Mistake: Regular home tile adhesive won’t hold up underwater.
    • Fix: Use pool-rated thinset mortar and waterproof grout only.
  3. Reattaching Cracked Tiles
    • Mistake: Reusing tiles that are chipped or cracked.
    • Fix: Replace damaged tiles with new ones for a proper seal and finish.
  4. Insufficient Curing Time
    • Mistake: Refilling the pool before mortar and grout have cured.
    • Fix: Always allow 24–48 hours of drying time as recommended.
  5. Not Matching Grout Color
    • Mistake: Ignoring aesthetics when selecting grout.
    • Fix: Use color-matching grout for a seamless look.

Extra Tips & Pool Hacks

  • Keep Spare Tiles: When building or resurfacing your pool, always keep 10–20 extra tiles for future repairs.
  • Seal Grout Annually: Use a pool-safe grout sealer to extend the life of your tile work.
  • Check for Structural Issues: If you keep losing tiles in the same spot, it may signal a deeper issue—consult a pool professional if the problem persists.

📖 Related article: [How to Repair Broken Pool Tiles] for advanced or large-scale tile repairs.

Conclusion

Fixing loose pool tiles might seem like a small task, but it can make a huge difference in your pool’s function, safety, and beauty. With the right tools, materials, and a little patience, you can tackle this common pool repair like a pro. Don’t let a few loose tiles turn into a big problem—get ahead of it and keep your pool looking perfect.

👉 Bookmark this guide so you’re ready the next time a tile starts to shift or crack.