Grout isn’t just filler — it holds your tile job together. The kind you pick matters. If you’ve stood in a hardware store staring at bags labeled “sanded” and “unsanded,” you’re not alone. These two types may look similar, but they’re built for different jobs. Using the wrong one can lead to cracks, gaps, or even damaged tile. Here’s how to tell which grout belongs where and why.
What Is Sanded Grout?
Sanded grout has fine sand mixed into the base. The sand adds strength and reduces shrinkage. It’s thicker and a little rough to the touch.
Best For:
- Tile joints 1/8 inch wide or larger
- Floors, especially high-traffic areas
- Stone, ceramic, or porcelain tile
Why Use Sanded Grout?
- Won’t shrink or crack as it dries
- Stronger for wider joints
- Less expensive than unsanded grout
When Not to Use It:
- On glass tile — the sand can scratch
- On polished stone like marble or granite
- In joints smaller than 1/8 inch — it won’t pack in well
What Is Unsanded Grout?
Unsanded grout has a smoother texture because it doesn’t contain sand. It’s made for narrow tile joints and delicate surfaces. It spreads more easily into tight spaces and gives a clean finish without grit.
Best For:
- Tile joints 1/16 to 1/8 inch wide
- Walls, backsplashes, vertical areas
- Glass, metal, and polished stone tiles
Why Use Unsanded Grout?
- Gentle on scratch-prone tile
- Fills narrow joints smoothly
- Clings better to vertical surfaces
When Not to Use It:
- For joints wider than 1/8 inch — it may shrink or crack
- On large floor tiles — not strong enough for big gaps
Quick Comparison
| Sanded Grout | Unsanded Grout | |
|---|---|---|
| Texture | Gritty with sand | Smooth |
| Best Joint Width | 1/8 inch or wider | 1/16 to 1/8 inch |
| Best Use | Floors, heavy use | Walls, backsplashes |
| Tile Type | Ceramic, porcelain | Glass, polished stone |
| Cost | Usually lower | Usually higher |
Other Things to Consider
Sealing
Both sanded and unsanded grout often need sealing unless they’re epoxy or premixed. Sealing adds stain and water resistance. Sanded grout tends to absorb more moisture, so sealing is especially useful on floors and in wet areas.
Color Matching
Some people say unsanded grout gives cleaner lines and sharper color in narrow joints. But both types come in a wide range of colors, and final appearance depends on mixing, application, and how you clean the surface after grouting.
Application
- Sanded grout can be harder to work into tight joints
- Unsanded grout may sag in wide floor joints
Summary
If your grout lines are wide — 1/8 inch or more — sanded grout is your best bet. It’s stronger, less likely to shrink, and ideal for floors. For tight joints, glass tile, or walls, unsanded grout fits better and won’t scratch surfaces. Pick the one that matches your tile size and surface type. When in doubt, check the tile maker’s guide — they’ll often say which grout type works best for their product.
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