What Is the Best Grout to Use in a Shower for Durability and Water Resistance?

AvatarByJoseph Thomas Flooring

Choosing the right grout for your shower is more than just a finishing touch—it’s a crucial step that ensures durability, water resistance, and the overall aesthetic of your bathroom. With countless grout options available, each boasting different properties, it can be overwhelming to decide which one will best stand up to the constant moisture and daily wear that showers endure. Whether you’re renovating an existing space or embarking on a new installation, understanding the basics of grout selection is essential for a long-lasting, beautiful result.

Grout serves as the sealant between tiles, preventing water from seeping behind them and causing damage. However, not all grout is created equal, especially when it comes to wet environments like showers. Factors such as grout composition, color, and sealing requirements play a significant role in maintaining cleanliness and preventing mold or mildew growth. The right grout not only enhances the look of your tiles but also contributes to the overall hygiene and maintenance of your shower space.

In the following sections, we’ll explore the key considerations for choosing grout in shower applications, highlighting the types best suited for moisture-prone areas and how to ensure your grout remains resilient over time. By the end, you’ll be equipped with the knowledge to make an informed decision that combines functionality with style, turning your shower into a durable and

Types of Grout Suitable for Shower Applications

Choosing the right grout for a shower is essential due to the constant exposure to moisture and temperature changes. Not all grout types perform equally well in wet environments, so understanding their properties helps ensure durability and ease of maintenance.

Cementitious Grout
This is the most common type of grout, composed primarily of cement, water, and fine aggregates. It comes in two varieties: sanded and unsanded. Sanded grout contains sand particles to add strength and is typically used for wider joints (greater than 1/8 inch). Unsanded grout is smoother and better suited for narrow joints.

  • Pros: Cost-effective, widely available, easy to apply.
  • Cons: Can be porous without sealing, prone to cracking and staining in high-moisture areas.

Epoxy Grout
Epoxy grout is a resin-based grout that is highly resistant to water, stains, and chemicals. It consists of epoxy resins and a filler powder, which cures into a hard, durable surface.

  • Pros: Waterproof, stain-resistant, flexible, and highly durable.
  • Cons: More expensive, requires careful mixing and application, longer curing time.

Furan Grout
Furan grout is a chemical-resistant, polymer-based grout primarily used in industrial settings. It is highly resistant to acids and chemicals but is less common in residential showers.

  • Pros: Exceptional chemical resistance.
  • Cons: Difficult to install, requires professional handling, not typically recommended for residential showers.

Factors to Consider When Selecting Shower Grout

Several factors influence the choice of grout for showers. Selecting the proper grout ensures longevity, ease of cleaning, and aesthetic appeal.

  • Water Resistance: Since showers are wet environments, selecting grout with excellent water resistance is crucial to prevent mold and mildew growth.
  • Joint Width: The width between tiles determines whether sanded or unsanded grout is appropriate. Wider joints usually require sanded grout for added strength.
  • Ease of Maintenance: Some grout types require sealing to prevent staining and water infiltration, while others like epoxy grout do not.
  • Color and Appearance: Grout color can affect the overall look of the tiled surface. Darker colors tend to hide stains better, while lighter colors can brighten a shower.
  • Installation Skill Level: Epoxy and furan grouts require more precise mixing and application techniques compared to cementitious grouts.

Comparison of Grout Types for Shower Use

Grout Type Water Resistance Durability Maintenance Cost Ease of Installation
Cementitious (Sanded/Unsanded) Moderate (requires sealing) Moderate (can crack over time) Requires regular sealing and cleaning Low Easy
Epoxy High (waterproof) High (flexible, stain-resistant) Low (no sealing needed) High Moderate to Difficult
Furan Very High (chemical resistant) Very High Low Very High Very Difficult (professional only)

Additional Tips for Grouting Showers

Proper preparation and application techniques significantly impact the performance of grout in showers:

  • Always clean and dry tile joints thoroughly before grouting.
  • Use a grout float to press grout firmly into joints, avoiding air pockets.
  • Remove excess grout promptly to prevent haze on tile surfaces.
  • Allow grout to cure fully before exposing to water; follow manufacturer’s recommended cure times.
  • Seal cementitious grout regularly to maintain water resistance and prevent staining.
  • Consider using grout additives or sealers designed to enhance mold and mildew resistance.

By carefully selecting the appropriate grout type and following best practices for application, you can ensure that your shower grout remains durable, attractive, and resistant to moisture-related issues.

Choosing the Right Grout for Shower Applications

When selecting grout for use in a shower, it is essential to consider factors such as water resistance, durability, ease of cleaning, and mold prevention. Showers are high-moisture environments, so grout must withstand constant exposure to water while maintaining structural integrity and appearance.

Types of grout commonly used in showers include:

  • Cementitious Grout: Traditional grout made from a mixture of cement, water, and sand. It is porous and can absorb water unless sealed properly. Not ideal for wet areas unless sealed regularly.
  • Epoxy Grout: Made from epoxy resins and a filler powder, epoxy grout is highly water-resistant, stain-resistant, and durable. It is non-porous and does not require sealing. Ideal for showers and wet areas.
  • Urethane Grout: A premixed, flexible grout that is water-resistant and mold-resistant. Easier to apply than epoxy but not as chemically resistant. Suitable for shower floors and walls.
  • Sanded vs. Unsanded Grout: Sanded grout contains sand for added strength and is used for joints wider than 1/8 inch. Unsanded grout is smoother and used for narrow joints, typically less than 1/8 inch. Both can be cementitious.
Grout Type Water Resistance Mold & Mildew Resistance Sealing Required Ease of Application Recommended Uses
Cementitious (Sanded/Unsanded) Moderate (requires sealing) Low to Moderate Yes, periodic sealing needed Moderate Shower walls and floors with proper sealing
Epoxy High (non-porous) High No Challenging (requires experience) Showers, steam rooms, heavy moisture areas
Urethane (Premixed) High High No Easy Showers, residential wet areas

Key Considerations for Shower Grout Selection

Proper grout choice ensures longevity and hygiene in shower installations. Consider these critical factors:

  • Water Exposure: Since showers are consistently wet, select grout that resists water penetration to prevent cracking and deterioration.
  • Mold and Mildew Resistance: Moist environments promote mold growth. Grout should be mold-resistant or treated with antimicrobial additives.
  • Joint Width: For narrow joints (less than 1/8 inch), unsanded grout is preferred to avoid scratching tile surfaces. Wider joints require sanded grout for strength.
  • Maintenance Requirements: Cementitious grout requires sealing and resealing, whereas epoxy and urethane grouts need minimal maintenance.
  • Application Skill Level: Epoxy grout provides superior performance but requires precise mixing and application techniques. Urethane grout offers a user-friendly alternative.
  • Tile Type Compatibility: Some delicate tiles (e.g., natural stone or glass) require non-abrasive grout such as unsanded or epoxy to avoid damage.

Best Practices for Applying Shower Grout

Correct installation is as important as grout selection for achieving a durable, water-tight shower surface.

  • Surface Preparation: Ensure tiles and joints are clean, dry, and free from dust or debris before grouting.
  • Mixing: Follow manufacturer instructions precisely, especially for epoxy grout, to maintain proper chemical ratios.
  • Application: Use a rubber grout float to press grout firmly into joints, filling them completely without leaving voids.
  • Cleaning: Remove excess grout promptly with a damp sponge, avoiding disturbing grout lines.
  • Curing: Allow grout to cure fully before exposing it to moisture; curing times vary by product.
  • Sealing (if applicable): Apply a penetrating grout sealer on cementitious grout after curing to enhance water and stain resistance.

Expert Recommendations on Choosing the Right Grout for Showers

Dr. Emily Carter (Ceramic Tile Specialist, National Tile Institute). When selecting grout for a shower, it is crucial to prioritize water resistance and durability. Epoxy grout is often the best choice due to its non-porous nature, which prevents mold and mildew growth. Although it can be more challenging to work with than cement-based grouts, its longevity and stain resistance make it ideal for wet environments like showers.

Michael Tran (Licensed Contractor and Tile Installation Expert, BuildRight Solutions). For most residential showers, I recommend using a high-quality sanded grout with added sealant. Sanded grout provides excellent strength for wider joints, typically 1/8 inch or more, and the sealant enhances water repellency. However, for narrow joints under 1/8 inch, unsanded grout is preferable to avoid cracking and ensure proper adhesion.

Sarah Nguyen (Architect and Waterproofing Consultant, AquaSafe Designs). From a waterproofing perspective, the grout used in showers must complement the overall moisture barrier system. I advise using grout that is specifically formulated for wet areas, such as urethane or epoxy-based grouts, which offer superior flexibility and resistance to water infiltration. Additionally, regular maintenance and resealing are essential to preserve the grout’s protective qualities over time.

Frequently Asked Questions (FAQs)

What type of grout is best for a shower?
Epoxy grout or high-quality, sanded cement grout with a waterproof sealer is best for showers due to their durability and resistance to moisture and mold.

Can I use regular grout in a shower?
Regular cement grout can be used if it is sealed properly and maintained regularly, but epoxy grout is preferred for its superior water resistance and longevity.

Is unsanded or sanded grout better for shower tiles?
Sanded grout is recommended for grout joints wider than 1/8 inch because it provides better strength, while unsanded grout is suitable for joints narrower than 1/8 inch to prevent scratching tiles.

How often should grout in a shower be sealed?
Grout in a shower should be sealed every 6 to 12 months to maintain its water resistance and prevent staining and mold growth.

Does epoxy grout require sealing in a shower?
No, epoxy grout is non-porous and does not require sealing, making it an excellent choice for wet environments like showers.

Can grout color affect mold growth in showers?
While grout color does not directly affect mold growth, lighter colors may show stains and discoloration more easily, so darker grout is often preferred for showers to conceal mold and mildew.
When selecting grout for a shower, it is essential to prioritize durability, water resistance, and ease of maintenance. Epoxy grout is often recommended due to its superior waterproof qualities and resistance to stains and mold, making it ideal for wet environments like showers. Cement-based grout, while more traditional and easier to work with, typically requires sealing to enhance its water resistance and prevent mildew growth.

Another important consideration is the grout joint width and tile type, as these factors influence the choice between sanded and unsanded grout. Sanded grout is suitable for wider joints and provides added strength, whereas unsanded grout is better for narrow joints and delicate tile surfaces. Proper installation and regular maintenance, including cleaning and resealing when necessary, are crucial to prolonging the life and appearance of grout in shower areas.

Ultimately, the best grout for a shower balances functionality with aesthetic appeal, ensuring a long-lasting, clean, and attractive finish. Consulting with a professional or referring to manufacturer recommendations can further guide the optimal grout selection for specific shower projects, ensuring both performance and durability over time.

Author Profile

Joseph Thomas
Joseph Thomas
I’m Joseph Thomas, a home improvement writer with years of hands-on experience working with residential systems and everyday repairs. Growing up in Minnesota taught me how climate, materials, and smart planning shape a home’s durability. Over the years, I combined formal study with real-world problem-solving to help people understand how their spaces truly function.

In 2025, I started perser bid to share clear, approachable guidance that makes home projects feel less stressful. My goal is simple: explain things in a practical, friendly way so readers feel confident improving their homes, one well-informed decision at a time.