What to Do If You Notice Cracked Grout
Why Is My Grout Cracking, and How Can I Fix It?
Cracked grout is more than just a cosmetic issue—it can lead to water leaks, mould growth, and tile damage if left untreated. Whether you’ve noticed hairline cracks or missing grout, it’s important to fix the problem quickly before it worsens.
Here’s what causes grout cracks, how to repair them, and when you might need a professional.
1. Why Does Grout Crack?
🔍 Common causes of cracked grout:
✔ Normal wear and tear – Over time, grout naturally weakens and may develop small cracks.
✔ Improper installation – If grout was not mixed or applied correctly, it may crack prematurely.
✔ Movement in the tiles – Structural shifts in your home or improper tile spacing can cause cracks.
✔ Excess moisture – If water gets behind tiles, it can weaken grout and cause cracking.
✔ Using the wrong grout type – Certain areas (like shower corners) need flexible grout or silicone instead of rigid grout.
💡 Tip: Small cracks are usually just a maintenance issue, but larger cracks may indicate underlying structural problems.
2. How to Fix Minor Cracks in Grout
If the grout is just starting to crack but is still in place, you can fix it with simple touch-ups.
🛠 DIY Fix: Grout Repair for Small Cracks
✔ Step 1: Clean the cracked area with a soft brush and mild detergent.
✔ Step 2: Let the area dry completely before applying new grout.
✔ Step 3: Mix matching grout (powdered grout + water) to a smooth paste.
✔ Step 4: Apply the grout using a rubber float and press it firmly into the cracks.
✔ Step 5: Wipe excess grout with a damp sponge before it dries.
✔ Step 6: Let it cure for 24–48 hours before exposing it to water.
💡 Tip: If your shower grout cracks repeatedly, consider using epoxy grout, which is more flexible and water-resistant.
3. What If Grout is Missing or Falling Out?
If pieces of grout are missing, simple patching won’t be enough—you’ll need to remove and replace the grout in that area.
🛠 DIY Fix: Regrouting
✔ Step 1: Use a grout removal tool or oscillating multi-tool to carefully remove the damaged grout.
✔ Step 2: Vacuum or wipe away any dust and debris.
✔ Step 3: Apply new grout using a rubber float.
✔ Step 4: Wipe off excess grout with a damp sponge and let it dry.
💡 Tip: If cracks keep appearing, the tiles may not be properly secured to the surface beneath them.
4. When to Use Silicone Instead of Grout
Certain areas, like corners, shower edges, and where tiles meet different surfaces, need flexible silicone sealant instead of rigid grout.
✔ Use silicone in:
✅ Shower corners
✅ Where the shower floor meets the walls
✅ Around bathtubs and sinks
💡 Tip: If grout cracks in these areas, replace it with mould-resistant silicone instead of new grout.
5. When to Call a Professional
📞 Signs you need a professional:
✔ Large cracks across multiple tiles – Could indicate movement beneath the tiles.
✔ Water damage or mould behind tiles – May require re-tiling and waterproofing.
✔ Persistent cracking after repairs – Could mean a deeper issue with the foundation or tile installation.
✔ Cracked grout in a newly renovated bathroom – Might be due to improper installation.
💡 Tip: A tiling expert can determine whether simple regrouting is enough or if underlying repairs are needed.
6. Preventing Future Grout Cracks
🚿 Tips to extend the life of your grout:
✔ Use flexible, high-quality grout designed for wet areas.
✔ Ensure tiles are securely installed to prevent movement.
✔ Use silicone in corners and expansion joints instead of grout.
✔ Avoid harsh cleaners that can weaken grout over time.
💡 Tip: Proper ventilation in your bathroom reduces moisture buildup and prevents grout from weakening.
Final Thoughts: Don’t Ignore Cracked Grout!
Small grout cracks might seem harmless, but they can quickly lead to water damage and costly repairs if ignored. Whether it’s a simple fix or a sign of deeper issues, addressing cracked grout early will keep your bathroom safe, watertight, and looking great.
At Custom Bathroom Creations, we ensure high-quality grout application that lasts—so if you’re experiencing recurring grout issues, we’re happy to help!
Need expert advice on grout repairs? Contact us today!