Grout fills the joints between tiles. It's a small part of the job, but it affects how the finished tile looks and how much cleaning it needs.
Types of grout
- Unsanded grout is smooth and used for narrow joints, typically 1/8 inch or less, and on tile that could scratch, like polished marble or glass.
- Sanded grout contains fine sand for strength and is used for wider joints, typically 1/8 inch and up, such as on many floors.
- Epoxy grout is very stain-resistant and doesn't need sealing, which makes it popular for showers and kitchens. It's harder to install, so it can cost more.
- High-performance cement grouts sit in between, with better stain resistance than standard cement grout.
Picking a color
- Match the tile for a calm, seamless surface.
- Contrast with the tile to show off a pattern, like dark grout with white subway tile.
- Go mid-tone on floors. Light grays, warm grays and beiges hide everyday dirt far better than bright white.
- Look at a cured sample. Grout dries lighter or darker than it looks wet, so ask to see a sample stick or a cured sample.
Joint width
Narrower joints look cleaner, but tile edges have to be straight and the floor flat for narrow joints to work. Rectified tiles, which have precisely cut edges, can be set with tighter joints than tiles with natural, slightly uneven edges.
Sealing
Standard cement grout is porous and is usually sealed after it cures, then resealed every so often depending on use. Epoxy grout doesn't need sealing. Follow the grout manufacturer's directions for cure time before sealing.
Keeping grout clean
- Wipe up spills, especially coffee, wine and tomato, before they set.
- Use a pH-neutral cleaner; harsh acids and bleach can wear down grout and some tile.
- In showers, squeegee or wipe the walls after use to cut down on soap film and mildew.
- Keep the bathroom well ventilated; run the fan during and after showers.
When grout needs attention
Cracked or missing grout lets water behind the tile. Small cracks can often be regrouted. Widespread cracking, loose tiles or soft spots can point to a problem underneath and are worth having looked at.