When to Use Sanded or Unsanded Grout: The Complete Guide
Most tile installation mistakes don’t happen during the tiling itself they happen at the grouting stage. Choosing the wrong type of grout is one of the most common (and costly) errors homeowners and even some contractors make. The good news? Once you understand the logic behind when to use sanded or unsanded grout, the decision becomes simple and straightforward. At SF Marble and Granite, we’ve worked on hundreds of tile projects from kitchen backsplashes to full bathroom renovations and grout selection is one of the first things we evaluate before any tile goes down. This guide is built on that real-world experience. What Is the Difference Between Sanded and Unsanded Grout? Before diving into when to use each type, it helps to understand what makes them different at a fundamental level. Sanded grout contains fine sand particles mixed into the compound. That sand acts as a binder and filler, giving the grout more body and structural strength. It’s designed to fill wider joints without cracking or shrinking as it dries. Unsanded grout (also called non-sanded grout) has no sand particles. It has a smoother, creamier consistency that adheres well to vertical surfaces and works in tighter spaces where sand particles would actually prevent a clean fill. The core difference comes down to joint width. Grout joints are the gaps between tiles, and the size of those gaps determines which type of grout will perform properly and which will fail. Here’s a simple breakdown: Feature Sanded Grout Unsanded Grout Joint Width 1/8 inch or wider Less than 1/8 inch Texture Rough/gritty Smooth Shrinkage Low Higher Best For Floors, large-format tile Wall tile, glass tile, polished stone Cost Slightly less expensive Slightly more expensive When to Use Sanded Grout (Practical Guide) Joint Width of 1/8 Inch or More This is the primary rule. If your tile joints are 1/8 inch (3mm) wide or larger, sanded grout is your go-to choice. Without the sand particles, an unsanded mix will shrink significantly as it cures, leaving visible cracks and gaps in wide joints. That looks bad and eventually leads to moisture getting underneath your tile. Floor Tile Installations For floor tiles ceramic, porcelain, natural stone like travertine or slate sanded grout is almost always the right call. Floors take constant foot traffic and physical stress. The sand particles give the cured grout more durability and resistance to wear over time. If you’re doing a mudroom, bathroom floor, or kitchen floor, you should be using sanded grout in most cases. Outdoor and High-Moisture Areas Patios, pool surrounds, and outdoor walkways are environments where the grout is exposed to temperature swings, freeze-thaw cycles, and continuous moisture. Sanded grout handles these conditions better because it has less shrinkage and more structural integrity. This is when should you use sanded grout becomes especially clear anytime the installation is outdoors or subjected to significant environmental stress. Large-Format or Rectified Tile with Wider Spacing Large-format tiles (anything 12×12 and bigger) are often laid with slightly larger grout joints to allow for lippage correction and substrate movement. In these cases, sanded grout is essential to fill the joint properly without cracking. Rough or Textured Tile Surfaces If your tile has a natural, rough texture slate, hand-painted ceramic, tumbled marble sanded grout tends to blend in better visually. The slight texture of the grout complements the tile’s character rather than contrasting with it. When to Use Unsanded Grout (Practical Guide) Joint Width Less Than 1/8 Inch The uses for non-sanded grout start with the joint. If your tile joints are narrower than 1/8 inch, non-sanded grout is the right choice. Trying to pack sanded grout into a tight joint is like trying to fill a crack in the wall with coarse-grain sand the particles prevent full penetration, leaving the joint weak and incomplete. Polished or Soft Stone Tile Marble, limestone, and other polished natural stones scratch easily. The sand particles in sanded grout can drag across the tile surface during application, leaving fine scratches that dull the finish permanently. This is one of the clearest situations where you should use non-sanded grout regardless of joint width. Glass Tile Glass tile is unforgiving. It’s smooth, reflective, and shows every imperfection. Sand particles can scratch the surface and the transparent nature of glass makes any improper grouting highly visible. Always use unsanded grout with glass tile. Vertical Wall Installations Non-sanded grout has better adhesion and stickiness compared to its sanded counterpart. On vertical surfaces shower walls, kitchen backsplashes, feature walls sanded grout can slump or slide during application before it sets. The smoother consistency of unsanded grout allows it to stay put on vertical surfaces while it cures. Speaking of backsplashes, if you’re considering a Backsplash Installation in Lowell, MA, the right grout selection is just as important as the tile itself. Grout color and type directly affect the final look and the long-term durability of the installation. Mosaics and Small-Format Tile Mosaic tiles with very tight joints (common in mesh-mounted sheets) almost always require non-sanded grout. The fine joints simply can’t accommodate sand particles, and the grout needs to flow smoothly into every small gap. Sanded vs Unsanded Grout (Quick Comparison) When thinking about sanded vs unsanded grout, don’t overcomplicate it. Here’s the practical decision tree: Ask yourself: How wide are my grout joints? Less than 1/8 inch → Use unsanded grout 1/8 inch or wider → Use sanded grout What surface am I tiling? Polished stone or glass → Use unsanded regardless of joint width Floors with heavy traffic → Use sanded Vertical wall tile with tight joints → Use unsanded What’s the environment? Outdoor or high-moisture → Lean toward sanded Decorative interior wall → Either can work depending on joint size The answer to should I use sanded or unsanded grout almost always comes back to joint width first, tile surface material second, and application location third. You can read about: Bathroom Tile Grout Common Mistakes to Avoid Even experienced DIYers make these grout selection errors. Knowing them in advance
When to Use Sanded or Unsanded Grout: The Complete Guide Read More »









