Grout gets treated as an afterthought more often than it should be. The type you choose affects how much maintenance a tile floor actually needs, how well it resists staining, and how it holds up in a wet room, all separate from whatever tile sits on top of it.
The Three Main Grout Types
Three grout types cover almost every residential tile project, and choosing between them comes down to joint width, moisture exposure, and how much maintenance you actually want to sign up for.
Sanded Grout
A cement-based grout with sand added for strength, generally used for wider joints, roughly an eighth of an inch or larger. It's the most affordable option, easy to work with, and what most installers have the most experience using. It's porous though, and needs to be sealed to resist moisture and staining.
Unsanded Grout
Essentially the same as sanded grout without the sand, used for narrower joints where sand would make it harder to pack in cleanly. Like sanded grout, it needs sealing to stay moisture- and stain-resistant.
Epoxy Grout
A different material entirely, resistant to stains and moisture without needing to be sealed at all. It costs meaningfully more and takes more skill and time to install correctly, which is why it's often reserved for wet areas or light-coloured grout lines where its stain resistance matters most.
Choosing Grout Width
Grout joint width is partly a style choice and partly a practical one. Narrower joints read as more modern and show less grout overall; wider joints are more forgiving of slight variations in tile size and are common with handmade or natural stone tile, since those materials rarely come perfectly uniform edge to edge. Large format tile often pairs with a narrower joint for that clean, seamless look, while a rustic or handmade-look tile often looks more intentional with a wider one. Your tile's own manufacturer generally specifies a recommended joint width range for their product, worth checking before assuming a width based on style alone.
What Happens Right After Grouting
The window right after grout goes on matters more than people expect. Excess grout on the tile surface needs to be wiped away with a damp sponge well before it fully dries, ideally within about half an hour, since the longer a thin cloudy residue, called grout haze, sits on the tile, the harder it becomes to remove later. If haze does dry on the surface, a dedicated haze-removal product or a diluted household acid like vinegar can lift it, though testing on a small area first matters, especially on natural stone, which some acidic cleaners can etch or dull. Sealing, for grout that needs it, generally happens only after the grout has had real time to cure, often close to a week, applying sealer too early can trap moisture underneath rather than protecting the surface.
Sealing and Ongoing Maintenance
Sanded and unsanded grout both need sealing to resist moisture and staining, and resealing every couple of years is a reasonable general habit to keep them performing well, more often in a shower or another consistently wet, high-traffic spot, and less often in a dry, low-traffic room. Epoxy grout skips this step entirely once it's cured. Day to day, a pH-neutral cleaner and regular sweeping or vacuuming keep any grout type looking its best; harsh acidic cleaners can wear grout down over time and are worth avoiding.
Grout Colour Is Part of the Design, Not an Afterthought
Grout colour genuinely changes how a floor reads. A grout close in tone to the tile itself creates a more seamless, larger-feeling floor with the pattern of individual tiles fading into the background. A contrasting grout, a dark grout with light tile or the reverse, makes each individual tile visible and turns the layout itself into part of the design. Neither is more correct than the other, it's a real style decision, but it's worth making deliberately rather than defaulting to whatever a showroom sample happens to pair a tile with. Practically, lighter grout shows dirt and staining more visibly over time than a mid-tone or darker grout does, worth factoring in for a high-traffic or food-prep area specifically.
Which Grout Actually Fits Your Project?
| Sanded | Unsanded | Epoxy | |
|---|---|---|---|
| Best for | Wider joints, most floors | Narrow joints | Wet areas, light colours |
| Needs sealing | Yes | Yes | No |
| Relative cost | Lowest | Similar to sanded | Highest |
How Much Grout Do You Actually Need
Grout quantity depends on tile size, joint width, and grout depth, larger tile with narrow joints needs noticeably less grout than small mosaic tile with wider joints, since mosaic has so much more total joint length packed into the same square footage. Most grout manufacturers publish a coverage chart based on these variables, and it's worth calculating from that rather than guessing, since running short mid-project means matching a new batch to the exact shade already on the floor, which doesn't always go perfectly even with the same product name. Ordering a modest amount extra beyond the calculated coverage is a reasonable habit, both for the inevitable waste during mixing and application, and as a small reserve for future repairs down the road.
Frequently Asked Questions
A few questions that come up often about grout.
How do I know if my grout needs resealing?
A simple test: drip a little water onto the grout line. If it soaks in quickly rather than beading up, it's time to reseal.
Can grout colour be changed after installation?
Professionally recolouring existing grout is possible in some cases, but it's a real project, not a quick fix, so it's worth choosing colour carefully at installation.
Is epoxy grout worth the extra cost for a whole house?
Not usually. It earns its keep most clearly in wet, high-spill areas like kitchens and bathrooms; a standard sealed sanded or unsanded grout is a perfectly reasonable choice elsewhere.
Why does grout sometimes look darker in some spots than others?
Uneven sealing or a spot that wasn't fully wiped clean during installation are common causes. A consistent seal across the whole floor helps keep colour uniform over time.
How soon after grouting can I clean the floor normally?
Light sweeping is generally fine within a day or two, but hold off on mopping or any real wet cleaning until the grout has had real time to cure, often close to a week, so you don't compromise it while it's still setting.
What causes grout to crack?
Movement in the subfloor underneath, an area that never got proper support, or grout that was mixed or applied incorrectly are the common causes. A small hairline crack can sometimes be patched; widespread cracking usually means something underneath needs attention, not just the grout itself.
Can I change grout colour without removing the old grout?
A grout stain or colourant can shift the tone of existing grout to a limited degree, but it's a real, involved process, not a quick fix, and results vary depending on how porous and how clean the existing grout is. Full removal and regrouting is the more reliable route to a genuinely different colour.
Not sure which grout fits your project? Contact us, or see our full guide to tile flooring for everything else worth knowing.
— The Word of Mouth Floors team
hello@wordofmouthfloors.com · (888) 966-3579