Why Is My Backsplash Grout Cracking?

Cracks in grout lines are a common issue many homeowners face with their backsplash tile installations. While grout cracks may seem like only a cosmetic problem, they can lead to more serious damage if left unaddressed. Understanding the common causes of grout cracking can help you pinpoint fixes to stop further cracking and preserve your backsplash.

Common Causes of Cracked Grout in Backsplashes

There are several factors that can cause grout to crack and crumble in backsplash areas:

Improper Grout Installation

One of the most common reasons for cracked grout is that it was not installed correctly in the first place. Some key mistakes that often lead to early grout failure include:

  • Using too little grout between tiles – The grout joints should be packed fully to avoid weak spots.
  • Not allowing proper grout cure time – Grout needs several days to cure and dry thoroughly before being exposed to moisture.
  • Poor grout mixing – Using too much water or additives can weaken grout.
  • Applying grout over dirty tile – Grout won’t bond well to oily or dusty tiles.
  • Not sealing porous grout – Unsealed grout absorbs stains and moisture that deteriorate it.

Excessive Moisture

Moisture is the natural enemy of grout. Tile backsplashes in kitchens and bathrooms are unavoidably exposed to lots of water. Over time, moisture causes:

  • Grout erosion from exposure to water splashes, leaks, condensation, steam, etc.
  • Cracks from continual wet-dry cycles as grout expands and contracts.
  • Damage from water seeping into minute pores and freezing.
  • Growth of mold, mildew and efflorescence from dampness.

It’s impossible to keep a backsplash totally dry, but promoting proper drying and ventilation can help.

Structural Shifting or Movement

Tile and grout can crack from the normal movements of a building over time. This includes:

  • Settling of foundations that strains floors and walls.
  • Vibration from doors slamming or heavy objects banging tile.
  • Expansion and contraction of materials from temperature swings.
  • Loose or unstable substrate materials behind tiles.

Careful installation on solid backing minimizes these stresses, but some movement is inevitable in any building.

Normal Wear-and-Tear

Like any material, grout gradually wears down from regular use. In kitchens, cooking splatters, food stains, pots and pans banging around, and frequent cleaning all slowly degrade grout. Cracks tend to appear first in high traffic zones. Managing wear-and-tear prolongs the life of grout.

Inferior Grout Quality

Grout comes in many types and quality levels. Grout made with low-grade materials is more vulnerable to cracking, crumbling, and staining. Using a high-performance epoxy or urethane grout suitable for kitchens is wise for backsplashes.

Consequences of Cracked Backsplash Grout

It’s easy to dismiss a few hairline cracks in grout lines as only a cosmetic nuisance. However, without repair, further damage is likely to occur:

  • More cracks spreading across the backsplash.
  • Loose tiles as cracked grout fails to hold them in place.
  • Water seeping underneath tiles, leading to leakage, mold or wall damage.
  • Stains and mildew forming in worn grout that is difficult to clean.
  • Need for complete regrouting or tile replacement if neglected too long.

Catching and fixing grout cracks early is much easier and cheaper than letting extensive damage develop.

DIY Repairs for Cracked Backsplash Grout

Thankfully, it is fairly straightforward for homeowners to tackle basic grout crack repairs on their own. Here are some easy DIY methods to try:

Clean Out Loose Grout

The first step is to dig out any grout in the crack that is already loose or crumbling using a grout saw, utility knife, or other thin tool. Remove debris and vacuum the crack well so repairs will adhere.

Resurface with Fresh Grout

For hairline cracks, you can simply mix up fresh grout and work it into the crevices with a grout float or squeegee. Avoid smearing grout where you don’t want it. Wipe diagonally across the crack to fully pack it.

Caulk Over Cracks

For wider cracks or areas where grout keeps cracking recurrently, consider using a flexible silicone caulk designed for kitchen/bath instead of regrouting. Apply a thin bead into the crack and smooth gently with a dampened fingertip.

Use Grout Sealer or Epoxy

Sealing the repaired areas with a penetrating grout sealer adds waterproofing. For the ultimate seal, brush thin epoxy resin designed for grout into the cracks and wipe away excess before it dries.

Retile Small Sections

If cracking is very severe in one section, you may wish to remove and retile that part of the backsplash. Use caulk between the new tiles and existing ones.

When to Call a Professional for Grout Repair

For home DIYers, grout cracks wider than a hairline or signs of leakage behind tiles may warrant calling in a professional for major grout repairs. A pro can:

  • Properly diagnose the root cause of extensive cracking.
  • Regrout entire walls using pressure injection for maximum adhesion.
  • Install waterproofing membranes behind tiles.
  • Accurately match new grout colors to the old.
  • Repair related damage like loose tiles, mold growth, or wall damage.
  • Offer expert advice to prevent recurrent cracking.

A professional grout restoration can give you peace of mind knowing it was done right. Many tile installers offer routine grout maintenance services in addition to repairs.

Preventing Future Backsplash Grout Cracks

To help minimize grout cracks from cropping up, keep these maintenance tips in mind:

Control Moisture

  • Seal grout periodically with a water-based sealer made for kitchens/bathrooms. Reseal every 1-2 years.
  • Immediately wipe up spills, splashes and condensation on backsplash.
  • Run kitchen and bathroom exhaust fans to reduce humidity during cooking or showering.
  • Check for hidden leaks and remedy immediately if found.

Clean Grout Gently

  • Use a soft, non-abrasive nylon brush to lightly scrub grout. Avoid stiff brushes and harsh cleansers.
  • Rinse backsplash well after cleaning to remove all chemicals.
  • Limit use of bleach cleaners which degrade grout over time.

Be Gentle With Backsplash

  • Don’t scrape pans or sharp tools across the tile surface.
  • Shield backsplash from impacts when working in kitchen.
  • Avoid hanging heavy items on backsplash tile or grout that could tug and cause cracking.

Check for Crack Signs

  • Periodically scan grout for hairline cracking and address right away.
  • Look for cracks in high use areas like around stove or sink.
  • If cracking grout is more than superficial, investigate the cause before repairing.

Consider Epoxy Grout

For a new installation or major regrouting, use 100% epoxy grout instead of traditional cement-based grout for maximum stain/crack resistance.

Grout Cracks Don’t Have to be a Headache

Minor grout cracks are par for the course with any tile backsplash, but a quality installation and proper care can minimize their occurrence. Pay attention to changes in your grout, and make timely repairs as needed without panic. Arm yourself with the right cleaning tools and materials to tackle cracks skillfully on your own. Know when it makes sense to bring in a tile professional for major grout restoration or hidden issues beneath your backsplash. With some diligence about grout maintenance, your beautiful backsplash can stay intact for many years before requiring true replacement.

FAQs About Cracks in Backsplash Grout

What is the easiest way to repair cracked grout in a backsplash?

For quick crack fixes, buy a premixed grout repair caulk or epoxy and simply apply it into the damaged grout lines. The flexible epoxy fills cracks and provides a waterproof seal to prevent further damage. Make sure to clean out any loose grout first.

Should I use caulk or grout to fix backsplash cracks?

In high moisture areas like backsplashes, caulk often works better for repairs than rigid grout which can recrack. Silicone or urethane caulks last longer flexing with movement. But for very fine hairline cracks, resurfacing with fresh grout works well.

How do you permanently fix cracked grout?

To permanently repair hairline cracks, thoroughly clean out the grout and apply an epoxy resin designed for grout repairs. Epoxy chemically fuses with existing grout for waterproof durability. For wider cracks, flexible caulk lasts longer than regrouting. Severely cracked areas may need tiles removed and replaced.

Why does my grout keep cracking in the same place?

If grout cracks keep recurring in the same spots, there is likely an underlying issue causing it. This could be a problematic substrate or framing issue behind the tile, excessive moisture exposure, or a poorly supported joint subject to movement and vibration. Identifying and correcting the root problem is key.

Should I use sanded or unsanded grout for my backsplash?

In general, unsanded grout is better for backsplash areas with narrow grout lines 1/8” or less. It provides a smoother finish and avoids sand grains that can get stuck and dislodge in small joints. But check your tile manufacturer’s recommendations on sanded vs. unsanded grout.

Is it normal for new grout to crack?

It is fairly common for some hairline shrinkage cracks to show in new grout installations as the grout dries and cures. These are usually superficial and can be patched. But extensive cracking right after regrouting indicates issues with grout mixing, prep work, or curing conditions.

How can I make my grout stronger?

To strengthen grout, be sure to pack joints fully when applying and allow proper drying time. Sealing annually improves stain/water resistance. For heavy-duty applications, choose a high-performance grout made for kitchens/bathrooms. Upgrading to flexible epoxy grout gives added durability.

Should I seal my backsplash grout?

Sealing backsplash grout every 1-2 years is highly recommended to protect it from stains and moisture damage. Look for a penetrating sealer specifically made for grout rather than a surface coating. Reapply whenever water no longer beads up on sealed grout.

Is epoxy grout better for backsplashes?

Yes, epoxy resin grouts are ideal for backsplashes since they resist stains, cracks, and water much better than cement grouts. The 100% epoxy formula is more flexible and durable. It’s harder to work with but provides the ultimate protection in wet kitchen zones.


Cracked or crumbling grout in a backsplash is a nuisance but doesn’t necessarily spell disaster for your tile. Armed with the right information on causes, repair techniques, prevention, and proper product selection, most homeowners can keep their backsplash grout in good shape for years of beauty and function. Pay attention to changes, make timely repairs, and get help when major issues arise. With some diligent care, your backsplash can withstand the stresses of daily life and continue bring you joy.