Common Culprits of Cracking Grout in Tile Floors

Cracking grout can be a frustrating problem for anyone with tile floors. It not only affects the aesthetics of your space but also poses potential long-term issues if left unattended. In this post, we'll explore some of the common reasons why grout can crack on your tile floor and what you can do to prevent it.

Cracked grout in shower

1. Subpar Installation

One of the leading causes of grout cracking is improper installation. If the tiles aren't set correctly, or if there's a lack of adequate adhesive, the floor's movement over time can cause stress on the grout lines, resulting in cracks. To prevent this, it's crucial to hire experienced professionals for your project. **According to the ANSI and the TCNA Handbook, tile requires a minimum of 80% mortar coverage in interior applications, and 95% for exterior and wet environments. Natural stone tile requires 95% coverage in all areas.**

2. Shifting Subfloor

Changes in temperature and humidity can cause the subfloor to expand and contract. This movement can transfer stress to the tile and grout above, leading to cracks. Ensure your subfloor is properly prepared, and use flexible adhesives to help absorb some of this movement. (We will get in more detail in another post on this subject.)

3. Insufficient Grout Joints

Grout joints serve as buffers between tiles, allowing for slight movement. If the grout lines are too narrow, they may not have enough room to accommodate this movement, leading to cracks. Ensure your installer uses the appropriate grout joint width for your tile size and type. (We will get in more detail in another post on this subject.)

4. Settlement and Foundation Issues

In some cases, cracking grout may be a symptom of underlying foundation problems. If your home experiences significant settlement, it can affect the integrity of your floor. It's advisable to consult with a structural engineer if you suspect this to be the cause. (We are not structural engineers but we do know that this is an apparent issue/cause, but we cannot give advice on this as we are not the experts!)

Foundation Settlement

Foundation Issues

5. Inadequate Maintenance

Neglecting proper maintenance can also contribute to grout issues. If your tiles are exposed to heavy foot traffic or are in areas prone to moisture, they may require more frequent resealing and cleaning. Cracks can develop if grout becomes weakened over time.

Preventing Cracking Grout

To prevent cracking grout in your tile floor, consider the following:

• Invest in professional installation.

• Use the right adhesive and flexible grout.

• Ensure the subfloor is well-prepared

• Maintain the appropriate grout joint width.

• Regularly clean and reseal the grout.

By following these tips, you can significantly reduce the risk of cracking grout and enjoy a beautiful, long-lasting tile installation. Understanding the reasons behind cracking grout in you tile floor is the first step toward preventing it. Remember, proper preparation, high-quality materials, and diligent maintenance are the keys to success when it comes to preserving the integrity of your grout.

Remember, if you have any specific concerns or issues related to your tiling and flooring store, feel free to reach out to us at (573) 873-2072, or come by the showroom!! We would be happy to give you any free advice or recommendations for your project!

Katie