When Should You Use Sanded vs. Unsanded Grout?

AvatarByJoseph Thomas Flooring

Choosing the right type of grout can make all the difference in the durability and appearance of your tiled surfaces. Whether you’re embarking on a new tiling project or refreshing an existing one, understanding when to use sanded or unsanded grout is essential. These two grout types serve distinct purposes and excel under different conditions, making the decision more than just a matter of preference.

Grout not only fills the gaps between tiles but also contributes to the overall strength and aesthetic of the installation. The choice between sanded and unsanded grout depends on several factors, including the width of the grout lines, the type of tile, and the location of the tiled area. Making the right choice ensures your grout will hold up over time, resist cracking, and complement your design.

In the following sections, we’ll explore the characteristics of sanded and unsanded grout, helping you understand their best applications. Whether you’re dealing with delicate porcelain tiles or rugged stone, knowing when to use each type will empower you to achieve professional-looking results that stand the test of time.

Choosing the Right Grout Based on Joint Width

The width of the grout joint is one of the most critical factors when deciding between sanded and unsanded grout. Sanded grout contains fine sand particles which help to strengthen the grout and prevent shrinkage, making it ideal for wider joints. In contrast, unsanded grout is smooth and free of abrasives, allowing it to flow into narrow spaces without scratching delicate tile surfaces.

Typically, the guidelines for grout joint width are as follows:

  • Joints 1/8 inch (3 mm) or wider: Sanded grout is recommended due to its durability and resistance to cracking.
  • Joints narrower than 1/8 inch: Unsanded grout is preferred because it can properly fill tight spaces without exerting excessive pressure on the tiles.

Using the incorrect type of grout for the joint width can lead to problems such as cracking, shrinking, or difficulty in application.

Joint Width Recommended Grout Type Reason
Less than 1/8 inch (3 mm) Unsanded Grout Flows smoothly into narrow joints without scratching tiles
1/8 inch (3 mm) to 1/2 inch (12 mm) Sanded Grout Provides strength and prevents shrinkage in wider joints
Greater than 1/2 inch (12 mm) Specialty or Mixed Grout May require additives or epoxy grout for extra durability

Surface Type and Tile Material Considerations

The type of tile and its surface texture also dictate the choice between sanded and unsanded grout. Sanded grout’s abrasive particles can scratch softer tiles such as natural stone, polished marble, or glass tiles. For these delicate surfaces, unsanded grout is safer because it lacks sand, thus reducing the risk of damage during application.

On the other hand, ceramic, porcelain, and quarry tiles are generally harder and more resistant to abrasion. These can usually be grouted with sanded grout without concern for scratching, especially when joint widths are appropriate.

When selecting grout for specific tile materials:

  • Use unsanded grout for:
  • Polished marble and natural stone tiles
  • Glass tiles
  • Tiles with a glazed or delicate surface finish
  • Use sanded grout for:
  • Ceramic and porcelain tiles
  • Quarry tiles
  • Textured or matte finish tiles that can withstand abrasion

This distinction helps preserve the aesthetic quality of the tile while ensuring a durable grout joint.

Environmental and Functional Factors Impacting Grout Choice

Environmental conditions and the functional use of the tiled area should also influence the grout decision. Areas exposed to moisture, heavy foot traffic, or frequent cleaning require a grout type that balances strength and maintenance needs.

Sanded grout tends to be more durable and resistant to wear in high-traffic areas such as kitchen floors, entryways, and commercial spaces. Its texture also helps prevent cracking when subjected to movement or temperature fluctuations.

Conversely, unsanded grout is often chosen for vertical surfaces like walls, backsplashes, and shower enclosures, where the grout lines are narrow and less prone to mechanical stress. Unsanded grout also provides a smoother finish which is easier to clean in these applications.

Key environmental considerations include:

  • Moisture exposure: Both types can be used, but unsanded grout may require sealing on porous tiles to prevent water penetration.
  • Traffic load: Sanded grout is generally more resilient on floors and heavy-use areas.
  • Cleaning frequency: Unsanded grout’s smooth surface can be easier to maintain on walls and delicate tiles.

By assessing these factors, installers can tailor their grout choice to optimize performance and longevity.

Summary of Application Recommendations

To assist in making an informed decision, the following points summarize appropriate uses of sanded and unsanded grout:

  • Sanded Grout: Best for floor tiles, joints wider than 1/8 inch, and hard surface tiles such as ceramic and porcelain.
  • Unsanded Grout: Ideal for wall tiles, joints narrower than 1/8 inch, delicate tile surfaces, and areas requiring a smooth finish.
  • Specialty Grouts: Consider epoxy or urethane-based grouts for extremely wide joints or areas exposed to harsh chemicals or heavy moisture.

Differences Between Sanded and Unsanded Grout

Understanding the fundamental differences between sanded and unsanded grout is essential for selecting the appropriate type for your tiling project. These differences influence application, durability, and suitability for various tile materials and joint widths.

Characteristic Sanded Grout Unsanded Grout
Texture Contains fine sand particles, giving a rougher texture Smooth and fine, no sand particles
Joint Width Ideal for joints 1/8 inch (3 mm) wide or wider Best for joints less than 1/8 inch (3 mm)
Application Surface Suitable for durable tile surfaces such as ceramic, porcelain, and stone Recommended for delicate surfaces like polished stone, glass, or tiles prone to scratching
Durability More resistant to shrinkage and cracking due to sand content Less resistant to shrinkage; may crack in wider joints
Appearance More textured and rough finish Smoother, cleaner finish

When to Use Sanded Grout

Sanded grout is best suited for specific scenarios where its properties enhance the performance and longevity of the tile installation.

  • Wide Joints: Use sanded grout for grout lines 1/8 inch or wider. The sand particles help prevent shrinkage and cracking in these wider joints.
  • Floor Tiling: It provides better durability and resistance to heavy foot traffic, making it ideal for floor installations.
  • Durable Tiles: Appropriate for hard, less delicate tiles such as ceramic, porcelain, and natural stone that can withstand the abrasiveness of the sand.
  • Outdoor Applications: Sanded grout’s texture improves adhesion and durability in outdoor environments.
  • Areas with Heavy Use: Spaces like kitchens, bathrooms, and commercial areas benefit from sanded grout’s strength and resistance to wear.

When to Use Unsanded Grout

Unsanded grout is designed for more delicate applications where a smooth finish and minimal abrasion are critical.

  • Narrow Joints: Use unsanded grout for joints less than 1/8 inch wide, where sand particles would be too coarse and difficult to work into tight spaces.
  • Delicate Surfaces: Ideal for tiles with polished or soft surfaces such as marble, glass, or polished porcelain to avoid scratching or damaging the tile.
  • Vertical Surfaces: Its smoother consistency makes it easier to apply on walls and backsplashes without sagging.
  • Refinishing or Repair: Suitable for touch-ups and repairs where maintaining a smooth, seamless appearance is important.
  • Interior Use: Commonly used indoors where heavy abrasion is less of a concern.

Factors Influencing Grout Selection

Choosing the correct grout depends on multiple factors beyond joint width and tile type. Consider the following to optimize your grout choice:

Factor Considerations Recommended Grout Type
Tile Material Porcelain, ceramic, natural stone, glass, marble Sanded for durable stone/ceramic; Unsanded for glass, marble, polished stone
Joint Width Size of the grout lines between tiles ≥ 1/8” use sanded; < 1/8” use unsanded
Surface Orientation Floor, wall, countertop, backsplash Floor: sanded; Wall and countertops: unsanded preferred
Exposure to Moisture Wet areas such as showers, pools, kitchens Both types can be used; consider grout additives or sealers for protection
Finish Appearance Desired texture and smoothness Textured: sanded; Smooth: unsanded
Durability Requirements Traffic and wear level High durability areas favor sanded grout

Expert Guidance on Choosing Between Sanded and Unsanded Grout

Linda Martinez (Ceramic Tile Specialist, National Tile Association). When deciding between sanded and unsanded grout, the key factor is the width of the grout joint. Sanded grout is ideal for joints wider than 1/8 inch because its gritty texture prevents cracking and shrinkage, providing durability in high-traffic areas. Conversely, unsanded grout is best suited for narrower joints under 1/8 inch, as it can be applied smoothly without scratching delicate tile surfaces.

Dr. Michael Chen (Materials Scientist, Advanced Construction Materials Lab). The choice between sanded and unsanded grout also depends on the type of tile and environmental conditions. Sanded grout contains silica sand, which enhances strength but can damage softer tiles like natural stone. Unsanded grout, lacking abrasive particles, is preferable for polished or soft tiles and areas prone to moisture, as it offers better water resistance and a finer finish.

Sarah Patel (Professional Tile Installer and Trainer, TileCraft Solutions). From a practical installation perspective, sanded grout is easier to work with on larger joints because it resists shrinking and cracking during curing. However, unsanded grout requires more careful application to avoid air pockets and ensure adhesion, especially on vertical surfaces or delicate tiles. Understanding these nuances helps ensure a long-lasting, aesthetically pleasing tile installation.

Frequently Asked Questions (FAQs)

What is the main difference between sanded and unsanded grout?
Sanded grout contains fine sand particles, making it more durable and suitable for wider joints, while unsanded grout is smooth and ideal for narrow joints and delicate surfaces.

When should I use sanded grout?
Use sanded grout for tile joints that are 1/8 inch or wider, especially on floors and walls where increased strength and resistance to shrinkage are necessary.

When is unsanded grout the better choice?
Unsanded grout is best for joints smaller than 1/8 inch and for delicate or polished tiles such as glass, marble, or ceramic, where sand could cause scratching.

Can sanded grout be used on vertical surfaces?
Yes, but it is generally recommended for horizontal surfaces due to its coarser texture; unsanded grout is preferred for vertical applications to prevent sagging.

Is unsanded grout more prone to cracking than sanded grout?
Unsanded grout is less resistant to shrinkage and cracking in wider joints, which is why it is best used in narrow joints where flexibility is less critical.

How does grout choice affect tile maintenance?
Sanded grout is more resistant to wear and staining in high-traffic areas, while unsanded grout requires more careful cleaning to avoid damage and discoloration.
When deciding between sanded and unsanded grout, the primary consideration is the width of the grout joints. Sanded grout is best suited for wider joints, typically those 1/8 inch or greater, as the sand particles provide added strength and reduce shrinkage. Conversely, unsanded grout is ideal for narrow joints less than 1/8 inch, where a smooth finish is necessary and the sand could interfere with proper adhesion.

Additionally, the type of tile surface plays a crucial role in grout selection. Unsanded grout is recommended for delicate or polished tiles such as glass, marble, or natural stone to prevent scratching. Sanded grout, due to its abrasive nature, is more appropriate for ceramic or porcelain tiles where durability is a priority and surface damage is less of a concern.

Understanding these distinctions ensures optimal grout performance, longevity, and aesthetic appeal. By carefully assessing joint width and tile material, professionals and DIY enthusiasts can make informed choices that enhance both the functionality and appearance of tiled surfaces.

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.