Sanded and Unsanded Grout Differences Explained

Installing tile can instantly upgrade the look of any space, from kitchen backsplashes to full bathroom remodels. But the grout used to fill in between the tile joints plays a critical role in not only the appearance of the finished project, but also the durability and performance of the tiled surface. With sanded and unsanded grout as the two main options, it's important to understand the differences between the two to choose the best grout for your specific tiling application.

With the right grout choice for your tile size and location, you can achieve professional-looking results.

Composition of Sanded vs. Unsanded Grout

While the primary difference lies in the presence of sand, it helps to understand the full ingredient list in sanded and unsanded grout. Let's look at what gives each their unique properties.

Ingredients in Sanded Grout

Sanded grout contains a mix of the following components:

• Portland cement - Binds the mixture and provides strength as it cures
• Sand - Varies in coarseness; gives the grout its gritty texture
• Pigments - For coloring the grout
• Water - Activates the cement to begin curing process

The sand in sanded grout provides some key advantages. It helps to fill the joints between tiles, prevents shrinkage as the grout dries, improves durability for high-traffic areas, and enhances the grout's stain resistance. Without sand, grout would be more prone to cracking over time.

Ingredients in Unsanded Grout

Unsanded grout contains:

• Portland cement
• Pigments
• Polymers - Improve flexibility and adhesion
• Water

The lack of sand allows unsanded grout to smoothly fill narrow grout lines for a uniform appearance. Polymers help improve its bonding capability and flexibility compared to sanded grout. The ingredients result in a grout more suited for smaller, delicate tile.

Texture and Consistency

The presence or absence of sand in the two grout types leads to significant differences in their texture and consistency both before and after application.

Sanded Grout Texture

Sanded grout has an extremely gritty, rough texture - almost like coarse sandpaper. This is due to the sand particles throughout the mixture. When wet, sanded grout has a thick, heavy consistency making it ideal for filling wider joints. When cured, the sandy texture remains, giving the grout joints more tooth to adhere to the tile edges.

Unsanded Grout Texture

Without sand particles, unsanded grout has a smooth, creamy texture before application. It can easily be pushed into thin grout lines thanks to its thin, toothpaste-like consistency. When dried, it maintains an ultra-smooth finish with a uniform appearance across the grouted joints.

Appropriate Uses and Tile Spacing

The different physical properties and textures of sanded and unsanded grout make them suitable for different applications and joint widths.

When to Use Sanded Grout

• Floor tiles
• Grout joints 1/8 inch and wider
• High foot traffic areas like hallways and kitchens
• Tile spacing up to 1/2 inch wide

The sand particles create a durable grout that can withstand daily wear and tear. Sanded grout resists shrinking or cracking over time, making it a great choice for floors. The thick consistency fills wider grout lines between floor tiles.

When to Use Unsanded Grout

• Wall tiles
• Grout joints less than 1/8 inch
• Water-sensitive natural stone tiles
• Glass, metal, or other delicate tile
• Thin grout lines and mosaics

For wall applications that won't be subjected to as much abuse, unsanded grout provides a smooth finish. Without sand it can easily fill very narrow grout spaces. The smooth texture also enhances the appearance of glass tile and mosaics.

Application and Installation

While the process of grouting tile is essentially the same for both sanded and unsanded, there are some differences to be aware of when working with each.

Working with Sanded Grout

• Only mix up enough grout that can be used in 30 minutes
• Let it slake or sit 5-10 minutes after mixing
• Hold grout float at 45deg angle and force into joints with firm pressure
• Remove excess grout holding float edge at 90deg angle
• Smooth and shape joints for consistency
• Wipe diagonally across tile surface to clean
• After drying, buff with soft cloth to remove haze

The wider grout lines that sanded grout is used for require some extra effort to fully pack the joints. Letting the mix slake makes it easier to work. Careful cleaning is required to prevent hazing on the tile surface.

Working with Unsanded Grout

• Mix only enough to use within 20 minutes
• Apply grout with narrow rounded tool for thin joints
• Wipe excess from tile gently to avoid pulling from joints
• Clean tile surface diagonally with minimal pressure
• Avoid buffing once dry since it can pull grout from thin joints

The thinner consistency of unsanded grout allows it to easily settle into the narrow grout lines. Gentle wiping and cleaning is key to keep it place without pulling it out of the delicate joints. Minimal drying haze develops with unsanded grout.

Appearance and Finishing

With such different textures, sanded and unsanded grout also deliver distinct finished looks once installed.

Sanded Grout Finish

Sanded grout dries with a rougher, more porous appearance compared to unsanded. The sandy texture remains, which some may find desirable for a more rustic or natural look.

Since it's not as uniformly smooth, slight variations in color can be visible across the grouted areas. The rough finish highlights the grout lines rather than blending seamlessly.

Unsanded Grout Finish

True to its name, unsanded grout dries to an ultra-smooth finish. The joints provide a neat, uniform appearance and are less noticeable than with sanded grout. This allows the tile itself to stand out.

The even grout lines highlight the colors, textures, and sheen of the tile. Glass and mosaic tiles benefit the most from the smooth finished appearance.

Grout Maintenance and Sealing

For long lasting beauty, proper grout maintenance is key for any tiled surface. Sealing is an essential step with both sanded and unsanded grout.

• Seal grout 7-10 days after installation
• Use a penetrating sealer made for grout
• Apply sealer evenly across grout joints
• Wipe excess sealer from tile surface
• Reapply sealer every 1-2 years

Sealing prevents stains from setting into the porous grout. Sanded grout's more absorbent texture especially benefits from a protective sealant. Be sure to use a grout-specific sealer for the best penetration.

• Vacuum or sweep regularly to remove dirt
• Mix mild detergent and water to clean grout
• Use a soft-bristled brush to scrub joints
• Rinse well and air dry
• Re-seal grout periodically

When selecting a grout, consider the tile type, joint width, and location in your home. Sanded grout is preferable for floor tile with joints over 1/8 inch. Its durable composition withstands foot traffic and supports wider spacing between tiles. For wall applications, narrow grout lines, and delicate tile like glass, unsanded grout provides smooth, uniform finishing.

With a little planning, you can achieve beautiful, long-lasting results. Grout installation takes some finesse, so don't be afraid to practice on loose tiles before the real thing. Follow the manufacturer's instructions for mixing and set times. When in doubt, consult with a tile professional to determine the best grout for your project.

Understanding the differences between sanded and unsanded grout allows you to make the optimal choice for your tiling needs. With the right grout selected and proper installation, you'll have a tile surface that looks amazing for years to come.