Choosing the right grout type can make or break your tile installation project. When it comes to sanded vs unsanded grout, making the correct selection ensures your tiled surfaces remain beautiful and functional for years to come. Many homeowners and even some contractors struggle with understanding when to use each type, leading to potential problems down the road.
This comprehensive guide breaks down everything you need to know about sanded vs unsanded grout, their differences, and exactly when to use each type for various applications including floors, walls, backsplashes, and specialty installations.
Understanding Grout Basics
Grout is the material that fills the spaces between tiles, creating a finished look while also providing stability and protection. While it might seem like a minor detail in the grand scheme of your renovation project, selecting the right type of grout is critical for both aesthetic and functional reasons.
The most fundamental grout decision is choosing between sanded vs unsanded grout. Each type has distinct properties and applications where they excel - and others where they might fail prematurely if used incorrectly.
What Is Sanded Grout?
Sanded grout contains fine silica sand particles mixed with cement, water, and other additives. The sand component provides strength and stability, making it ideal for certain applications.
Key Characteristics of Sanded Grout:
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Composition: Contains fine silica sand along with Portland cement and other additives
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Strength: Higher compressive strength than unsanded grout
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Shrinkage resistance: The sand particles help prevent significant shrinkage as the grout cures
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Texture: Slightly rougher finish compared to unsanded grout
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Joint width: Typically used for joints 1/8 inch or wider
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Applications: Floors, high-traffic areas, shower floors, outdoor installations
Sanded grout provides excellent durability in situations where the grout lines are subjected to weight, pressure, or frequent foot traffic. The sand component helps prevent cracking and maintains structural integrity over time.
What Is Unsanded Grout?
Unsanded grout, as the name suggests, doesn't contain sand particles. It consists primarily of Portland cement, water, and non-sand additives that create a smoother, more workable paste.
Key Characteristics of Unsanded Grout:
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Composition: Portland cement, water, and non-sand additives
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Consistency: Smoother and more paste-like than sanded grout
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Shrinkage: More prone to shrinkage during curing
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Texture: Creates a smoother finish than sanded grout
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Joint width: Ideal for narrow joints under 1/8 inch
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Applications: Vertical surfaces, polished stone, glass tile, metal tile
Unsanded grout works well in applications where the joints are narrow or where the tile material is easily scratched. Its smoother consistency makes it easier to work into tight spaces.
Sanded vs Unsanded Grout: Key Differences
Understanding the differences between sanded vs unsanded grout helps determine which is right for your specific project:
1. Strength and Durability
Sanded grout offers superior strength and durability. The sand particles provide structural support that helps the grout withstand pressure without cracking. This makes sanded grout ideal for floor applications where the grout will bear weight.
Unsanded grout has less compressive strength and is more prone to cracking when used in wider joints or areas subjected to weight and pressure.
2. Joint Width Compatibility
The width of your tile joints is perhaps the most important factor when choosing between sanded vs unsanded grout:
Sanded grout works best for joints 1/8 inch (3mm) or wider. The sand particles provide stability in wider joints and prevent excessive shrinkage and cracking.
Unsanded grout is ideal for narrow joints less than 1/8 inch wide. Without sand particles, it can be worked into tight spaces where sanded grout would be difficult to apply.
3. Application Ease
Sanded grout is slightly more challenging to work with due to its grittier texture. It requires more effort to push into joints and clean from tile surfaces.
Unsanded grout has a smoother, more butter-like consistency that makes it easier to apply in certain situations, particularly with narrow joints or delicate tile materials.
4. Shrinkage During Curing
Sanded grout shrinks less as it cures because the sand particles help maintain volume.
Unsanded grout tends to shrink more during curing, which is why it's not recommended for wider joints where significant shrinkage would be problematic.
5. Scratch Potential
Sanded grout contains abrasive sand particles that can potentially scratch delicate tile surfaces like polished marble, some ceramics, or glass tiles.
Unsanded grout is less likely to scratch delicate surfaces, making it the safer choice for glass tiles, polished stone, and metal tiles.
6. Cost Considerations
Sanded grout is typically less expensive per pound than unsanded grout, partly because sand is an inexpensive filler material.
Unsanded grout tends to cost more per pound but may require less material overall for narrow-joint applications.
When to Use Sanded Grout
Understanding exactly when to use sanded grout will ensure your tile installation remains beautiful and functional for years to come:
Floor Installations
Sanded grout is the preferred choice for most floor installations. Floors bear significant weight and foot traffic, requiring the additional strength that sanded grout provides. The sand particles help prevent the grout from cracking under pressure, making it ideal for:
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Kitchen floors
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Bathroom floors
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Entryways and foyers
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Living areas
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Commercial spaces
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Outdoor patios
Wide Grout Lines
For any installation with grout lines 1/8 inch (3mm) or wider, sanded grout is typically the better option. The sand prevents excessive shrinkage during curing, which would otherwise lead to cracking and an uneven surface.
High-Traffic Areas
Areas that experience heavy foot traffic benefit from the durability of sanded grout. The added strength helps the grout withstand the constant pressure without deteriorating prematurely.
Shower Floors
Shower floors specifically (as opposed to shower walls) are best served by sanded grout. The enhanced durability holds up better to the direct pressure of standing water and foot traffic.
Outdoor Applications
For exterior tile installations, sanded grout provides better resistance to the elements and temperature fluctuations. The additional strength helps prevent weather-related deterioration.
When to Use Unsanded Grout
Choosing unsanded grout is appropriate in several specific situations:
Narrow Grout Lines
For grout lines narrower than 1/8 inch (3mm), unsanded grout is the ideal choice. The absence of sand particles makes it easier to work with in tight spaces, and its smooth consistency allows for better penetration into narrow joints.
Wall Installations
Wall tile installations frequently use unsanded grout because:
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Wall tiles typically have narrower grout lines
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Walls don't bear weight like floors do
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The smoother consistency of unsanded grout makes it easier to apply on vertical surfaces
Delicate Tile Materials
When working with tiles that scratch easily, unsanded grout is the safer option. The sand particles in sanded grout can act like sandpaper against delicate surfaces during installation. Unsanded grout should be used with:
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Glass tiles
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Polished marble
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Limestone
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Metal tiles
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Some polished porcelains
Bathroom Wall Tile
Bathroom wall tile installations typically benefit from unsanded grout because most bathroom wall tiles are installed with narrow grout lines, and many decorative bathroom tiles have polished or delicate surfaces.
Kitchen Backsplashes
Kitchen backsplashes often feature decorative or glass tiles with narrow grout lines, making unsanded grout the preferred choice. The smooth consistency also creates a more refined appearance that complements decorative backsplash designs.
Sanded vs Unsanded Grout: Special Situations
Beyond the standard applications, there are several special situations worth considering in the sanded vs unsanded grout decision:
Sanded vs Unsanded Grout for Shower Walls
Shower walls present a unique challenge. While they don't bear weight like floors, they do experience significant moisture exposure. The decision between sanded vs unsanded grout for shower walls depends primarily on:
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Joint width - If your shower wall tile has joints wider than 1/8 inch, sanded grout provides better structural support and resistance to shrinkage.
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Tile material - For glass or polished stone shower tiles, unsanded grout prevents scratching.
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Vertical application - Unsanded grout is sometimes easier to apply on vertical surfaces due to its stickier consistency.
For most standard ceramic or porcelain shower wall tiles with moderate joint widths, either type can work, but unsanded is often preferred for its smoother finish and easier application on vertical surfaces.
Sanded vs Unsanded Grout for Porcelain Tile
Porcelain tile is extremely durable but the decision between sanded vs unsanded grout depends on:
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Joint width - Wide joints (≥1/8 inch) need sanded grout for strength
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Polished vs. unpolished - Highly polished porcelain may be scratched by sanded grout
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Floor vs. wall - Floor installations generally benefit from sanded grout's strength
Unpolished porcelain floor tiles typically work best with sanded grout, while polished porcelain or wall installations might be better suited to unsanded grout depending on the joint width.
Sanded vs Unsanded Grout for Glass Tile
Glass tile installations almost always call for unsanded grout. The sand particles in sanded grout can scratch the glass surface during installation, permanently damaging the appearance of your tiles. Unsanded grout provides:
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Scratch protection - No sand means less risk of scratching delicate glass surfaces
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Appropriate strength - Glass tile installations typically have narrow joints where unsanded grout works well
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Better aesthetic - The smoother finish of unsanded grout often complements the sleek appearance of glass tile
If you're installing glass tile with exceptionally wide joints (rare but possible), consult with a professional about specialty grout options.
Sanded vs Unsanded Grout for Natural Stone
Natural stone tiles like marble, travertine, slate, and limestone require careful consideration:
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Polished vs. honed finish - Polished stone can be scratched by sanded grout
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Joint width - Wider joints need sanded grout for structural support
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Application area - Floor installations benefit from sanded grout's strength
For most natural stone floor installations with standard joint widths, sanded grout provides the necessary durability. However, for polished marble or other soft stones, unsanded grout may be preferable to prevent scratching, even if it means sacrificing some strength.
Modified vs. Unmodified Grout: Another Consideration
Beyond the sanded vs unsanded grout question, you'll also encounter modified and unmodified options:
Modified grout contains polymers and latex additives that increase flexibility, adhesion, and water resistance. These additives make the grout more forgiving in environments with temperature fluctuations or moisture exposure.
Unmodified grout is traditional grout without polymer additives. It's generally less expensive but may require a separate sealer application.
Both sanded vs unsanded grout can come in modified or unmodified versions. For most modern home applications, modified grout offers superior performance and is worth the additional cost, especially in bathrooms, kitchens, and outdoor areas.
Epoxy Grout: The Third Option
When discussing sanded vs unsanded grout, it's worth mentioning epoxy grout as a premium alternative. Unlike traditional cement-based grouts, epoxy grout:
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Contains epoxy resins and hardeners instead of cement
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Offers superior stain resistance
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Provides enhanced durability
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Doesn't require sealing
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Is virtually waterproof
Epoxy grout comes in both sanded and unsanded varieties, making it suitable for various joint widths and applications. While significantly more expensive and challenging to work with, epoxy grout delivers exceptional performance for high-moisture areas like shower floors and commercial kitchens.
Application Tips for Sanded vs Unsanded Grout
Whichever type you choose, proper application techniques ensure the best results:
Working with Sanded Grout
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Mix thoroughly - Ensure all powder is incorporated to prevent weak spots
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Allow proper slaking time - Let the mixed grout sit for 5-10 minutes before applying
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Work in manageable sections - Typically 10-15 square feet at a time
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Use firm pressure - Pack the grout into joints completely to avoid voids
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Clean carefully - Use diagonal strokes across joints to avoid pulling grout out
Working with Unsanded Grout
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Mix to a thick paste consistency - Unsanded grout should be slightly thicker than sanded
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Apply with a rubber float - Use firm pressure at a 45-degree angle
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Work smaller sections - Unsanded grout typically dries faster than sanded
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Clean with minimal water - Excessive water can weaken unsanded grout
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Allow proper curing time - Usually 24-72 hours before exposing to moisture
Maintenance Differences: Sanded vs Unsanded Grout
Maintaining your grout properly extends its lifespan and keeps it looking fresh:
Sanded Grout Maintenance
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More porous - Generally requires sealing to prevent staining
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Textured surface - May trap dirt more easily than unsanded grout
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More durable against cleaning - Can withstand slightly more aggressive cleaning methods
Unsanded Grout Maintenance
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Smoother surface - Collects less dirt on the surface but is still porous
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More delicate - Requires gentler cleaning methods
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Still needs sealing - Despite being smoother, still benefits from proper sealing
Regardless of whether you choose sanded vs unsanded grout, all cement-based grouts benefit from:
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Regular cleaning with pH-neutral cleaners
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Periodic resealing (typically annually)
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Prompt cleaning of spills to prevent staining
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Avoiding harsh chemicals that can erode the grout
Color Considerations for Sanded vs Unsanded Grout
When selecting grout color, be aware that sanded vs unsanded grout may appear slightly different even in the same color:
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Sanded grout typically appears slightly lighter due to the presence of sand particles
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Unsanded grout often has a more uniform and slightly darker appearance in the same color
If you're using both types in the same space (for example, sanded on floors and unsanded on walls), you might need to select slightly different shades to achieve a visual match.
Cost Comparison: Sanded vs Unsanded Grout
Budget considerations may influence your decision between sanded vs unsanded grout:
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Sanded grout typically costs $15-30 per 25lb bag
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Unsanded grout usually costs $18-35 per 25lb bag
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Coverage rates vary depending on tile size, joint width, and joint depth
While unsanded grout is slightly more expensive per pound, the difference is minimal for most residential projects. The correct type for your application should take priority over minor cost differences.
Common Mistakes When Choosing Between Sanded vs Unsanded Grout
Avoid these common mistakes when selecting grout for your project:
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Using unsanded grout for wide joints - This leads to excessive shrinkage and cracking
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Using sanded grout with delicate tiles - Resulting in permanent scratches on tile surfaces
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Selecting grout based on price alone - The wrong type will cost more in repairs later
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Mixing different grout types within the same installation - Creates inconsistent durability and appearance
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Forgetting about environment considerations - Moisture exposure and traffic should influence your decision
Conclusion
Choosing between sanded vs unsanded grout doesn't have to be complicated once you understand the fundamental differences and appropriate applications for each. Remember these key points:
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Use sanded grout for joints 1/8" or wider and floor applications
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Choose unsanded grout for narrow joints and delicate tile surfaces
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Consider the specific environment and traffic the installation will experience
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Don't compromise on quality to save on material costs
At Pebble Tile Shop, we offer a complete range of both sanded and unsanded grout options to complement our extensive tile collection. Our expert staff can help you select the perfect grout type and color to ensure your tile installation looks beautiful and performs flawlessly for years to come.
For an even wider selection of tile options to pair with your grout choice, visit our sister company Tile Hub, where you'll find everything from classic ceramics to luxury natural stone and trendy glass options.
Remember, the right grout isn't just about filling spaces between tiles—it's an integral part of your installation's beauty, functionality, and longevity. Take the time to choose wisely between sanded vs unsanded grout, and your tiled surfaces will reward you with years of trouble-free performance.