Should I Use Sanded or Unsanded Grout? Answering the Question

When installing tile, one of the most important decisions is choosing between sanded or unsanded grout. But what exactly is the difference, and how do you decide which is right for your project?

We'll start by explaining what sanded and unsanded grouts are, their key differences, and the factors to consider when selecting between them.

Defining Sanded and Unsanded Grout

Sanded grout contains fine sand in addition to cement and color pigments. The sand gives it an extremely dense consistency. Unsanded grout, on the other hand, does not contain sand. It has a smoother texture and can flow into even the smallest cracks and tile joints.

Key Differences

There are several key ways that sanded and unsanded grouts differ:

• Texture - Sanded grout has a gritty, sandy texture while unsanded is smooth.
• Joint width - Sanded works best for joints 1/8 inch and wider. Unsanded is recommended for joints less than 1/8 inch.
• Cost - Sanded grout is generally more affordable than unsanded.

These differences make each type better suited for certain applications. We'll explore those next.

Best Applications

Where Each Excels

One of the biggest considerations when selecting a grout type is the width of the joints. Here are the recommendations:

• Joints 1/8 inch to 1/2 inch wide
• Floors
• Showers

Tile Type Suitability

Certain tiles work better with sanded or unsanded grout:

• Ceramic, porcelain, glass
• Textured stone like slate, travertine

• Polished stone tiles
• Glass
• Mosaics

The smoother, less abrasive nature of unsanded grout makes it safer for delicate tile surfaces.

Wet vs Dry Environments

Sanded grout stands up extremely well to water and moisture. Its dense sand-and-cement composition resists damage. This makes it an exceptional choice for showers, bathrooms, and outdoor areas exposed to the elements.

While unsanded grout can work in wet locations, it may be more prone to staining and discoloration over time. Proper sealing is critical to ensure good performance.

Mixing and Application

Installation is another area where the two grout types differ. From mixing to clean-up, the process involves some unique steps for each.

Mixing the Grout

Both sanded and unsanded grout are mixed with water prior to application. However, more water is required when mixing sanded grout to reach a trowelable consistency:

• Sanded - Mix with approximately 1-1/4 cups water per 1lb bag
• Unsanded - Mix with 3/4 to 1 cup water per 1lb bag

Application Techniques

Application technique varies slightly between types as well:

• Denser consistency requires packing into joints
• Hold grout float at 90 degree angle
• Force grout deeply into gaps

• Thinner consistency flows more easily
• Apply lightly with float in circular motions
• Does not require as much pressure to fill joints

In both cases, wiping with a damp sponge and removal of excess grout is critical.

Clean-Up

The gritty sand in sanded grout means it can be more difficult to remove from the tile surface. Additional scrubbing is often required. Sealing after installation can also help prevent stubborn haze.

The smooth texture of unsanded grout makes clean-up easier in most cases. Still, care must be taken to properly wipe the tile surface before drying.

Appearance and Finishing

The final appearance and finish of sanded vs. unsanded grout also warrants consideration:

Color Uniformity

The fine sand particles in sanded grout provide more consistent color. Unsanded grout can appear blotchy or patchy at times, particularly with darker grout colors.

Final Texture

The gritty sand in sanded grout gives the joints a visible sandy texture when dry. Unsanded grout dries with a smooth, uniform finish across the joints.

Haze Removal

The textured surface of sanded grout has more nooks and crannies for cement film to get lodged in. More scrubbing is required to fully remove grout haze. Sealing is also highly recommended to limit staining and soften removal.

The smooth finish of unsanded grout simplifies removal in most cases. Still, prompt clean-up before drying is important.

Long-Term Performance

Over years of use, sanded and unsanded grouts hold up differently.

Durability

The dense composition and wider joints make sanded grout extremely durable for high-traffic locations. Unsanded grout works well for lighter duty areas but is more prone to wear, cracking, and damage over time.

Staining & Efflorescence Resistance

Sanded grout offers good staining resistance. Though sealing is still suggested to limit absorption. Without sand filler, unsanded grout can be more porous and stain if not sealed properly.

Efflorescence is also more common with sanded grout. This white, powdery deposit is caused by moisture drawn up through cement-based materials. Keeping sanded grout sealed is the best prevention.

Cracking Resistance

The flexibility and narrow joints of unsanded grout make it more adept at resisting cracks from tile movement. Sanded grout's thicker build in wider joints causes it to be more rigid and prone to cracking.

Cost Comparison

Sanded grout is widely available and very affordable, making it the value choice for many tile jobs. Unsanded grout costs approximately 30-50% more in most cases. Its smoother mix and wider variety of colors increase pricing.

Labor is also a consideration. The wider joints and packing ability of sanded grout allow DIY-ers to achieve good results. Unsanded grout relies more on installer technique and skill to avoid issues like shrinking cracks, inconsistent fill, and pinholes.

We've covered the key differences, applications, installation, appearance, performance, and costs of sanded vs. unsanded grout. To recap, sanded grout is best for wider joints, wet areas, heavy use locations, and budget-friendly projects.

Unsanded grout suits thin joints, walls, polished stone, and where smooth finished appearance is preferred. Cost and installer skill are key cons to weigh.

As you evaluate your options, consider where the tiles will be installed, their surface sensitivity, the width of joints, and exposure to moisture or traffic. This will steer you towards the best grout for the job.