Sanded Vs. Unsanded Grout For Floors: Choosing The Right Grout For Your Flooring Project

When installing tile flooring, selecting sanded or unsanded grout for floors is a critical decision that affects durability, aesthetics, and maintenance. This in-depth guide explores the differences, benefits, and ideal uses of both grout types in floor applications. Homeowners, contractors, and DIY enthusiasts will find actionable insights for making the best choice for their flooring projects.

Aspect	Sanded Grout	Unsanded Grout
Best For Joint Width	1/8” (3mm) or wider	Less than 1/8” (3mm)
Slip Resistance	Higher (Good for floors)	Lower (Less ideal for floors)
Shrinkage	Minimal	Higher risk of cracks
Surface Suitability	Rough/Non-glass tiles	Smooth/Delicate tiles
Application Difficulty	Moderate	Easier for small joints
Cost	More affordable	Slightly more expensive

Understanding Sanded And Unsanded Grout

Sanded grout and unsanded grout serve different purposes in flooring. Sanded grout contains fine sand particles adding strength, while unsanded grout is a smooth mixture without sand, ideal for thinner joints. Knowing their distinct properties helps achieve lasting flooring results.

Key Differences Between Sanded And Unsanded Grout

The main distinction lies in the presence of sand. Sanded grout is gritty and robust, whereas unsanded grout feels creamy and is more suitable for narrow joints. These differences impact performance, application, and longevity on floors.

• Sanded Grout: Contains silica sand, preventing shrinkage; designed for joints 1/8 inch (3mm) or wider.
• Unsanded Grout: Smooth texture; best for joints less than 1/8 inch (3mm) wide, minimizing scratching risk on delicate tiles.

When To Use Sanded Grout For Floors

Best Applications For Sanded Grout

Sanded grout is most effective for floor installations where tile joints are 1/8 inch (3mm) wide or more. It provides enhanced structural integrity, reduces shrinkage, and offers slip resistance. It is suitable for:

• Porcelain and Ceramic Floor Tiles: With standard joint widths, sanded grout ensures stability and long-lasting fills between tiles.
• Natural Stone (Except Sensitive Surfaces): Works well with rugged surfaces such as slate or granite, unless the stone is prone to scratching.
• High Traffic Areas: Suitable for entryways, kitchens, and hallways due to its durability.
• Outdoor Tile Projects: Resists expansion and contraction from temperature shifts.

The sand in the grout increases traction, which is crucial for floor surfaces that require grip, reducing the risk of slips.

When To Use Unsanded Grout For Floors

Ideal Situations For Unsanded Grout

Unsanded grout is generally chosen for floors with narrow grout lines (less than 1/8” wide) or when working with sensitive or polished stone tiles that may scratch easily. It is best used in:

• Small Tile Joints: Provides a tight seal and prevents shrinkage where sanded grout may not compact properly.
• Polished Marble Or Glass Tiles: Avoids abrasions on delicate surfaces.
• Vertical Applications: Suitable for walls, but occasionally used on floors with very thin joints.

However, unsanded grout is less durable and more prone to cracking when applied to wide joints or floors with heavy foot traffic.

Advantages Of Sanded Grout For Floors

• Durability: Withstands foot traffic and heavier loads, making it an excellent choice for high-use areas.
• Reduced Shrinking and Cracking: Sand component prevents the grout from contracting as it cures.
• Affordability: Typically more cost-effective due to readily available sand filler.
• Wide Color Range: Available in numerous shades to complement floor tiles.

These advantages result in longer-lasting and more resilient grout joints, essential for floor longevity.

Advantages Of Unsanded Grout For Floors

• Scratch-Free Finish: Ideal for polished or smooth tile surfaces, ensuring no abrasion during installation.
• Strong Adhesion In Tight Spaces: Sticks well in narrow joints where sanded grout might crumble, delivering a seamless finish.
• Easy To Work With: Smooth consistency allows easier application in tiny gaps.

Though not as rugged as sanded grout, unsanded grout delivers superior aesthetics and performance for certain tile floor types and intricate patterns.

Common Floor Types And Recommended Grout

Floor Tile Type	Joint Width	Recommended Grout	Notes
Ceramic	1/8” – 1/2”	Sanded Grout	Good for durability
Porcelain	1/8” – 1/4”	Sanded Grout	Common in kitchens, baths
Polished Marble	< 1/8”	Unsanded Grout	Prevents scratching
Glass	< 1/8”	Unsanded Grout	Scratch protection
Natural Stone (Rough Textures)	1/8” – 1/2”	Sanded Grout	Not for polished surfaces

How To Decide Between Sanded And Unsanded Grout For Your Floor

To choose the optimal grout type for your floor, consider the following factors:

• Joint Width: The most crucial criterion. If joints are 1/8” or wider, go with sanded. For thinner joints, use unsanded.
• Tile Surface: If tiles are polished or easily scratched, unsanded grout is preferable.
• Traffic Level: High-traffic floors benefit from the durability of sanded grout.
• Location: Wet areas (like bathrooms) may require special polymer-modified grouts for mold resistance.
• Appearance: Unsanded grout yields a smoother, more refined grout line for intricate tilework.

Matching joint width and tile type remains the most significant consideration for most American flooring installations.

Installation Tips For Sanded Grout On Floors

Proper application of sanded grout ensures maximum durability and visual appeal.

• Ensure tile joints are thoroughly cleaned and free of debris before starting.
• Mix grout with water according to manufacturer recommendations for correct consistency.
• Press grout firmly into joints using a rubber float, making sure gaps are fully filled.
• Remove excess grout with a damp sponge, but avoid too much water, which can weaken joints.
• Allow to cure for 48-72 hours before heavy use; seal as recommended for added stain and moisture protection.

For natural stone floors, test on a small area to check for scratching before applying grout to the entire floor.

Installation Tips For Unsanded Grout On Floors

When using unsanded grout, extra care ensures tight, smooth finishes in narrow joints:

• Follow tile manufacturer recommendations to avoid overfilling joints, which can lead to surface residues.
• Apply with a small rubber float angled to maximize joint compaction.
• Clean surface quickly and gently to prevent grout haze, especially on glossy tiles.
• Allow to cure fully and use grout sealant for moisture resistance, especially in bathrooms or kitchens.

With unsanded grout, avoid trying to fill wide gaps as cracking is likely to occur.

Mixing And Curing: Best Practices For Both Grout Types

The mixing ratio of water to grout powder determines flow and final set. Always:

• Use clean, cool water to prevent premature setting
• Mix only as much grout as can be used in 20-30 minutes
• Let grout “slake” (rest) for 5-10 minutes before a final stir
• Keep floor undisturbed until grout is fully hardened

Proper curing prevents cracks, uneven color, and ensures a longer-lasting floor application.

Sealing Sanded And Unsanded Grout On Floors

Sealing enhances stain and moisture resistance of both sanded and unsanded grout, especially in kitchens, bathrooms, and mudrooms. Use a penetrating, water-based sealer matched to your grout type.

• Wait until grout is fully cured before sealing (time varies by product)
• Apply evenly and wipe away excess sealer from tiles promptly
• Reapply every year in high-traffic or wet areas for continued protection

Neglecting grout sealing is a common cause of water damage and discoloration, particularly in American homes with heavy floor use.

Grout Color Considerations For Floor Tiles

Color selection for grout impacts floor aesthetics significantly:

• Contrasting grout highlights tile pattern, making individual tiles stand out and adding visual interest.
• Matching grout blend creates a seamless, expansive look, ideal for small or irregularly shaped rooms.
• Darker grout hides dirt and stains better in busy households, while lighter grout can brighten a space.

Test grout samples in natural and artificial light before making a final choice for your floor.

Maintenance Of Sanded Vs. Unsanded Grout Floors

Both sanded and unsanded grout require regular maintenance to preserve appearance and performance:

• Clean spills immediately to avoid staining
• Use pH-neutral cleaners; acid-based products may degrade grout faster
• Inspect for cracks or missing patches and repair as needed
• Re-seal grout joints according to manufacturer recommendations

Proper upkeep ensures long-lasting floor grout and prevents premature tile damage.

Common Mistakes To Avoid

• Using sanded grout on delicate, polished tiles: Can result in surface scratches that are difficult to buff out.
• Using unsanded grout on wide joints: Leads to shrinkage, cracking, and water intrusion over time.
• Skipping grout sealing or cleaning: Results in mildew, stains, and costly repairs.
• Poor mixing or application: Causes color inconsistency and weakened joints, most visible on large or patterned floor tile installations.

Frequently Asked Questions About Sanded And Unsanded Grout For Floors

• Which Grout Lasts Longer On Floors?
  Sanded grout generally lasts longer on floors because it has higher structural strength and resists shrinking.
• Can Unsanded Grout Be Used On All Floor Tiles?
  No. It is best for small joints and delicate tiles. For normal floor joints, unsanded grout may crack or pull away from tiles.
• Does Grout Color Change Over Time?
  Yes. Everyday use, cleaning, and UV exposure can cause grout to fade or stain. Sealing helps preserve the intended color.
• Is It Easy To Replace Grout Later?
  Replacing grout is labor-intensive, especially on floors. Proper installation and maintenance prolong grout lifespan and reduce the need for regrouting.

Cost Comparison: Sanded Vs. Unsanded Grout

Grout Type	Average Cost (per lb.)	Yield (per 25 lbs.)
Sanded	$0.25 – $0.40	Grouts 100-200 sq. ft. (joint width dependent)
Unsanded	$0.40 – $0.55	Grouts 75-150 sq. ft. (narrow joints)

Sanded grout is typically less expensive and more widely available in bulk quantities, making it the top choice for large American flooring projects.

Modern Grout Innovations

Recent advances in grout technology address older concerns about durability and ease of cleaning:

• Polymer-Modified Grouts: Increased flex and stain resistance, ideal for bathrooms and kitchens.
• Epoxy Grouts: Maximum resistance to stains and moisture, but costlier and harder to install, mostly used in commercial or luxury residential applications.
• Pre-Mixed Grouts: Convenient and consistent, reducing installation errors for DIY projects.

While these products are more expensive, they can outperform traditional sanded and unsanded grouts in some challenging floor environments.

Expert Tips For DIY Floor Grouting

• Always read manufacturer directions specific to both tiles and grout for compatibility.
• Test application on a hidden tile section to spot potential scratching or discoloration.
• Work in small sections and wipe away any grout film before it dries fully on tiles.
• Use kneepads to prevent fatigue and ensure consistent pressure during floor grout application.
• Allow adequate curing time before use, especially in moisture-prone floor areas.

Following these expert pointers secures strong and attractive floor grout, matching professional standards.

Summary Table: Choosing Sanded Or Unsanded Grout For Floors

Floor Situation	Recommended Grout	Why
Standard Ceramic/Porcelain Floors	Sanded	Grout width typically > 1/8”, needs durability
Narrow Joint Mosaic Tile	Unsanded	Joint width < 1/8”, reduces surface scratching
Polished Marble OR Glass Tile Floor	Unsanded	Prevents scratching, easier to tool
Natural Stone With Rough Finish	Sanded	Handles wide joints and rough tile edges
High Traffic Entryway Or Kitchen	Sanded	Better resistance against wear and stains

Understanding when to use sanded or unsanded grout for floors optimizes tile performance, visual appeal, and longevity in any American home.