Unsanded vs Sanded Grout: A Practical Guide for Tile Projects

Why the unsanded vs sanded grout decision matters

Choosing the right grout type influences tile performance, maintenance, and long-term aesthetics. According to Grout Maintenance, the decision between unsanded vs sanded grout is not cosmetic; it affects durability, cleaning ease, and how well joints hold up under movement. The Grout Maintenance team found that the wrong choice can lead to cracking, color inconsistencies, or brushing away thin grout lines during cleaning. For most residential projects, the joint width, tile finish, and anticipated use should drive the decision as much as price or availability.

In practice, you’ll often see a clear boundary: unsanded grout for fine joints and delicate tile edges, sanded grout for wider joints and busier areas. But there are subtle nuances. Some tile types tolerate only one option due to glaze hardness or backing thickness, and ambient conditions such as humidity and heat can influence curing and final texture. This section unpacks those nuances and sets a practical framework for decision-making, so you can plan with confidence and avoid common pitfalls.

Grout selection is part science, part art. While the formulas determine performance, installation method and substrate quality determine how well that performance translates in real rooms. The guidance below is designed to be actionable for homeowners and DIYers, with clear thresholds and practical checklists.

Key differences at a glance

The unsanded vs sanded grout comparison boils down to a few core attributes. The grain size and composition of the grout mix determine how it feels, how it finishes the joints, and how resistant it is to wear. In general:

• Joint width: unsanded grout is best for very narrow joints; sanded grout supports wider gaps.
• Surface finish: unsanded produces a smoother surface, which is kinder to delicate tile edges; sanded leaves a slightly textured finish that can aid in stability.
• Tile compatibility: tile types with delicate glaze or soft edges benefit from unsanded; denser or unglazed tiles often pair with sanded grout.
• Durability and maintenance: sanded grout tends to resist crumbling in high-traffic areas, while unsanded grout can be easier to clean if joints stay narrow.
• Cost and availability: both are common; price differences are usually minor, but epoxy variants exist for both types and alter price and maintenance.

Understanding these differences helps you decide quickly, but context matters—tile size, location (wall vs floor), and expected moisture all influence the final choice.

When to choose unsanded grout

Unsanded grout is typically the go-to choice for very narrow joints (often 1/16 inch to 1/8 inch) and for vertical surfaces where the grout line will be less prone to abrasion. It is commonly recommended for wall installations, glass tiles, polished ceramic, and other delicate tile edges where a rougher, sand-based grout could scratch or abrade the glaze. The lack of sand particles means the mixture is smoother, which helps produce a clean, flat finish. Along with that, unsanded grout is easier to wipe clean during installation and touch-up because there is less texture to trap dust or debris. However, because it contains no aggregate, it can be less tolerant of tile movement and heavy foot traffic, making it less ideal for floors or exterior installations where joints are expected to flex. Humidity, temperature, and substrate movement can also influence crack formation, so stable substrates are essential. If you're unsure about joint width or tile type, test a small sample in a low-visibility area before committing to a full grout line.

When to choose sanded grout

Sanded grout is the natural choice for wider joints (roughly 1/8 inch to 3/8 inch) and for floors or busy wall areas where joints bear more movement and abrasion. The sand grit helps stabilize the mix, reducing shrinkage and preventing the grout from cracking as the substrate shifts. It is well-suited for porcelain and ceramic tiles with medium to large joints, natural stone surfaces, and areas with higher traffic or moisture exposure. Be mindful that the sand can be slightly abrasive on very delicate tile edges, potentially causing micro-scratches over time. When working with glass, polished marble, or very fine porcelain, test a small sample first to ensure the texture does not alter the tile’s appearance. Humidity and installation environment can affect cure and color; plan for adequate ventilation and a controlled drying window to minimize haze and color variance.

Performance factors: shrinkage, cracking, and finish

Joint movement from everyday use and structural settling can stress grout joints. Sanded grout’s coarse aggregate provides strength but can introduce a rough texture that holds onto dirt, while unsanded grout’s smooth surface is easier to wipe but may crack if joints flex significantly. Color consistency across batches is another practical concern; even small batch differences can appear after curing, especially on larger projects. Proper substrate preparation, back-buttering tiles where needed, and keeping joints clean during installation help minimize these effects. Grout curing is moisture-dependent; avoiding premature exposure to water helps prevent efflorescence and color changes. In terms of finish, sanded grout tends to finish with a slightly textured appearance, while unsanded grout remains smoother, which can influence cleaning frequency and tools used for maintenance.

Application tips for each grout type

Applying grout correctly matters as much as choosing the right type. For unsanded grout, use a small-angle grout float to press the material into very narrow joints and avoid forcing it into tile edges. Work in small sections, wiping away excess grout with a damp sponge before it fully sets. For sanded grout, a firmer float helps embed the sand particles fully while keeping joints crisp. Clean grout lines promptly to prevent haze; for both types, allow adequate curing time before exposing to moisture. Consider epoxy grout if you require exceptional stain resistance and reduced maintenance; however, epoxy is generally harder to work with and requires specialized cleaners, so weigh the trade-offs. Always test color and texture on a hidden area first and document the process for consistency across larger runs.

Cleaning, maintenance, and repair considerations

Grout is not forever—but with proper care it can last for decades. For routine cleaning, use non-abrasive cleaners and avoid acidic or highly concentrated products that can degrade cement-based grout. Unsanded grout, with its smooth finish, is easier to wipe but can stain if not cleaned promptly; sanded grout may hide dirt better due to its textured surface but can accumulate dust in crevices. Sealing cement-based grouts is common in damp areas, though some modern formulations claim enough resistance that sealing is optional. When stains or cracks appear, identify the root cause—cracking may indicate movement or improper substrate preparation, while staining could reflect moisture intrusion or improper cleaning. Repair options range from spot-regrouting to full regrouting; epoxy grout repairs are usually easier to match in color but may require replacing surrounding tiles if the area is large. Planning a maintenance schedule around humidity and use patterns helps extend grout life.

Color matching and texture considerations

Color variance between grout batches is a practical challenge. Even with the same batch, lighting and tile color can alter perceived shade, so it’s wise to order extra grout and store it in a sealed container for touch-ups. Texture consistency matters as well: unsanded grout delivers a sleek, flush look, while sanded grout offers a tactile joint. If you’re matching grout to existing tile, consider performing a color test in a less visible area and observe it under different lighting to ensure you’re comfortable with the final tone across the project. Some brands offer color-matching guides; don’t rely solely on swatches, as dye lots can vary slightly from batch to batch.

Practical decision framework and quick-scoring guide

To make the unsanded vs sanded grout decision efficient, follow a simple framework: 1) measure joints precisely; 2) assess tile edge delicacy and glaze; 3) evaluate location (wall vs floor) and anticipated wear; 4) consider moisture exposure; 5) compare maintenance expectations and budget. A quick scoring approach assigns higher weight to joint width and traffic level, guiding whether unsanded or sanded grout is likely the better fit. This approach reduces guesswork and helps you plan ahead for cleaning and repairs. Document decision criteria for future renovations and note any tile-specific cautions from the manufacturer to avoid warranty issues.

Regrouting and repair considerations

Over time, grout can crack, crumble, or discolor, especially in areas with movement or moisture. Regrouting may be preferable to removing and replacing tiles in some cases, particularly on walls or backsplashes with limited access. When planning a regrout, choose the same grout type if possible to maintain uniform appearance unless the joint width has changed. For large rooms, regrouting in stages can minimize disruption. For stubborn stains or mold growth, targeted cleaning and proper ventilation during cure periods help prevent recurrence. If you suspect structural issues contributing to grout failure, address those underlying problems before reapplying any grout to avoid repeating damage.

Environmental and long-term maintenance considerations

Sustainability and long-term maintenance are important factors in modern tile projects. Cement-based grouts are common and cost-effective, but grout additives and sealers can influence both environmental impact and cleaning frequency. Epoxy-based grouts offer superior stain resistance and lower porosity, reducing moisture-related concerns in damp areas, but their production and disposal require careful handling. Regardless of grout type, establishing a regular cleaning routine, using non-abrasive tools, and sealing where appropriate can dramatically extend service life. Mindful tiling choices—such as avoiding overly humid substrates, ensuring proper ventilation during curing, and selecting tiles with compatible glaze and edge qualities—further improve outcomes and minimize future repairs.

Quick-start checklist for unsanded vs sanded grout

• Measure joints accurately; select unsanded for joints under 1/8 inch, sanded for 1/8 inch to 3/8 inch.
• Consider tile type and edge delicacy; avoid sanded grout on very soft or glazed tile edges if possible.
• Plan for movement: floors and exterior walls may benefit from sanded grout; vertical walls with light traffic may be suited to unsanded.
• Factor maintenance: if cleaning with strong acidic cleaners is common, unsanded grout with a brighter finish may require more frequent upkeep.
• Sample first: test color and texture on a hidden area before full installation.