Epoxy Grout vs. Cement Grout: Which to Choose?
By Josh Kaplan
Key Takeaways
Epoxy grout resists stains, chemicals, and moisture far better than cement grout — ideal for showers and commercial kitchens.
Cement grout costs less upfront but requires sealing and periodic maintenance to stay clean and intact.
Epoxy grout is harder to install and less forgiving; DIY mistakes are costly and difficult to correct.
For existing grout problems in Suffolk or Nassau County, professional cleaning or restoration is often faster than re-grouting.
Epoxy Grout vs. Cement Grout: A Direct Comparison
The short answer: epoxy grout is more durable, stain-resistant, and chemical-proof — the right choice for high-moisture or high-traffic areas where long-term performance matters most. Cement grout is easier to work with, less expensive, and perfectly adequate for low-stress installations when properly sealed and maintained. The decision comes down to where the tile is, how it will be used, and who is doing the installation.
If you already have grout in place — whether epoxy or cement — and it's discolored, cracked, or deteriorating, the choice you face may be cleaning and restoration rather than replacement. Groutastic serves homeowners and businesses throughout Suffolk County and Nassau County, NY, and this guide will help you understand both materials fully before you commit to either a new installation or a repair.
Feature | Epoxy Grout | Cement Grout |
Composition | Epoxy resins + hardener + filler powder | Portland cement + sand + water |
Stain resistance | Excellent — inherently non-porous | Poor to moderate — porous; must be sealed |
Chemical resistance | High — withstands acids, cleaners | Low — can be damaged by harsh chemicals |
Moisture resistance | Excellent — no water absorption | Moderate — absorbs moisture without sealer |
Flexibility / crack resistance | Slightly flexible; resists cracking | Rigid; prone to cracking under movement |
Installation difficulty | High — sets fast, requires experience | Low to moderate — forgiving, DIY-friendly |
Upfront cost | Significantly higher | Lower |
Long-term maintenance | Minimal — no sealing needed | Regular sealing and cleaning required |
Best for | Showers, commercial kitchens, labs | Dry areas, walls, low-traffic floors |
Grout joint width | Works in joints ≥ 1/16" | Sanded: ≥ 1/8"; unsanded: < 1/8" |
What Is Cement Grout?
Cement grout — sometimes called cementitious grout — is made from Portland cement blended with sand, pigments, and water-retention additives. It has been the standard grout material for well over a century and comes in two main forms:
Sanded cement grout: Contains fine aggregate sand, used in joints 1/8 inch wide or wider. The sand reduces shrinkage and cracking in larger gaps.
Unsanded (non-sanded) cement grout: Smooth-textured, used in joints narrower than 1/8 inch and on polished stone or glass tile where sand could scratch the surface.
Cement grout is porous by nature. Left unsealed, it absorbs water, oils, and cleaning products — which is why cement grout in showers or kitchens discolors so reliably over time. A penetrating silicone or fluoropolymer sealer closes those pores temporarily, but the sealer degrades and must be reapplied every one to three years depending on traffic and moisture exposure.
What Is Epoxy Grout?
Epoxy grout is a two-part (or three-part) system composed of an epoxy resin, a chemical hardener, and a filler powder or aggregate. When the components are combined, they undergo a cross-linking chemical reaction that produces a dense, non-porous solid — fundamentally different from the hydration process that hardens cement. The result is a material that behaves less like a mineral and more like a rigid polymer.
Because the cured surface is non-porous, epoxy grout does not need a sealer at any point in its life. Stains, bacteria, mold, and mildew have nowhere to penetrate. This is why the Tile Council of North America (TCNA) recognizes epoxy grout as the appropriate choice for demanding environments such as commercial food-preparation areas, hospitals, and chemical laboratories.
The Practical Catch with Epoxy Grout
Epoxy grout's strength is also its greatest installation challenge. The two components begin reacting the moment they are mixed, giving the installer a limited open time — often 20 to 45 minutes depending on temperature — before the material becomes unworkable. Any squeeze-out that dries on the tile face is extremely difficult to remove, and some epoxy formulations will haze glass or polished stone if not cleaned off within minutes. For a seasoned tile setter this is manageable; for a first-time DIYer, it is a common source of expensive mistakes.
Which Is Better: Epoxy or Cement Grout?
Neither material is universally better — the right choice depends entirely on the application:
Shower floors and walls: Epoxy grout wins clearly. Constant moisture and soap residue will stain and degrade cement grout even when sealed. Epoxy's non-porous surface resists mold, soap scum, and hard-water deposits far more effectively.
Kitchen backsplashes: Either works, but epoxy's chemical resistance makes cleanup from grease and acidic foods easier. Cement grout is acceptable here if sealed properly and resealed regularly.
Bathroom floor tile: Epoxy is the stronger long-term performer, especially around the toilet base and sink where standing water is likely. Cement grout with a quality sealer can be adequate in lower-traffic bathrooms.
Living room or bedroom floors: Cement grout is the practical choice. The area is dry, traffic is moderate, and cement's lower cost and easier installation make perfect sense. Epoxy's advantages go largely unused here.
Commercial kitchens and food-service floors: Epoxy grout is the correct specification. Health codes in many jurisdictions require non-porous, chemical-resistant grout joints in food-preparation areas, and epoxy satisfies that requirement where cement grout cannot.
Exterior tile: Epoxy grout's limited thermal flexibility can be a drawback outdoors where freeze-thaw cycles cause substrate movement. A quality sanded cement grout or a specialized polymer-modified grout is often the better outdoor choice.
What About Using Concrete Instead of Grout?
Concrete should not be used as a substitute for tile grout. Concrete contains coarse aggregate and is formulated for structural loads, not for thin, precise joint-filling. It shrinks and cracks unpredictably in narrow joints, lacks the colorfast pigments of grout, and bonds poorly to tile edges. The question comes up occasionally in DIY forums, but the practical and aesthetic result is consistently poor. Use a grout product — cement-based or epoxy — that is specifically formulated for tile joints.
Why Builders Often Skip Grout Sealing (And Why That Matters for You)
A common complaint from homeowners is discovering that newly installed tile was never sealed. The reason is largely economic: sealing adds labor time and cost to a job that is already priced competitively. Some builders also rely on the homeowner to seal after move-in, though this is rarely communicated clearly. On a cement grout installation, an unsealed joint starts absorbing contaminants immediately — and grout that has never been sealed is significantly harder to restore later because staining reaches deep into the pores.
If you moved into a home in Suffolk County or Nassau County and suspect the grout was never sealed, professional grout cleaning followed by sealer application is the most efficient path to restoration. Groutastic provides exactly this service, and addressing it professionally is far faster than attempting to strip years of embedded staining with household cleaners.
Grout Cleaning and Restoration vs. Re-Grouting
Before committing to a full re-grouting project, consider whether restoration can achieve the result you want. In many cases it can:
Discoloration and surface staining: Professional hot-water extraction and alkaline cleaning agents can remove embedded soil, mold, and soap scum from cement grout that looks permanently gray or black. This is the most common grout problem and the most commonly over-estimated — it usually does not require re-grouting.
Cracked or crumbling grout: Grout repair, also called regrouting or grout raking, removes the damaged material and fills with fresh grout. A full tear-out is unnecessary unless the substrate itself has shifted.
Color mismatch after repairs: Grout colorant — a penetrating stain applied to cured grout — can unify mismatched joints after partial repairs and also functions as a sealer in cement grout applications.
Re-grouting is warranted when joints are so deteriorated that cleaning cannot recover the surface, or when switching from cement to epoxy grout for a wet area. In that scenario, the old grout must be mechanically removed — typically with a grout saw or oscillating multi-tool fitted with a carbide grout blade — before epoxy is applied.
What to Avoid When Choosing and Maintaining Grout
Do not use acidic cleaners on cement grout. Vinegar, citrus-based sprays, and tile descalers that contain hydrochloric or phosphoric acid will etch the cement matrix and accelerate joint breakdown over time. Use a pH-neutral or alkaline cleaner instead.
Do not assume epoxy grout is maintenance-free in every sense. While it needs no sealing, epoxy grout can still accumulate surface films from soap scum and hard water deposits. It cleans easily, but it is not self-cleaning.
Do not apply epoxy grout over existing cement grout. The bond will fail. Old grout must be removed first.
Do not mix epoxy components in excessively warm conditions without experience. Higher ambient temperatures accelerate the cure reaction and dramatically reduce working time, making application errors more likely.
Do not skip the float at the correct angle with epoxy. Epoxy grout requires firm, diagonal packing with a rubber float held at roughly 45 degrees. Working parallel to the joint pushes material out instead of packing it in, a mistake that is almost impossible to correct once curing begins.
When to Call a Professional
DIY grout installation or repair works well with cement grout in accessible, low-stakes areas. Call a professional when:
The installation involves epoxy grout over a large or complex surface — mistakes are costly and difficult to undo.
Existing cement grout is deeply stained and has resisted multiple cleaning attempts.
Grout is cracking repeatedly in the same locations, which may indicate substrate movement rather than a grout-quality issue.
The project is a commercial kitchen, food-service area, or healthcare environment where code compliance and non-porous surfaces are required.
Groutastic offers professional grout cleaning, repair, and restoration services throughout Long Island, including both Suffolk County and Nassau County. Whether the goal is reviving tired cement grout or assessing whether a wet area needs a full epoxy re-grout, a professional evaluation saves time and prevents costly errors.
Frequently Asked Questions
Is epoxy grout used differently on different tile types?
Yes. Epoxy grout requires extra care on highly polished stone (such as marble or honed limestone) and on textured glass tile because the epoxy residue can be difficult to remove from irregular or absorbent surfaces. On these materials, a careful installer will apply a release agent to the tile face before grouting and clean squeeze-out aggressively before it begins to set. On standard ceramic and porcelain tile — which have smooth, glazed faces — cleanup is far more straightforward.
What is the difference between white cement and tile grout?
White cement is a raw material — a purer, low-iron form of portland cement that lacks sand, pigments, and the additives that make grout workable in thin joints. Tile grout is a finished product formulated with precise particle sizes, colorants, and water-retention agents for joint-filling applications. White cement can be an ingredient in white grout, but it is not a substitute for it.
Can epoxy grout be used for grout repair on an existing cement grout installation?
Not directly over the existing cement grout. If a specific section needs replacement, the old grout in that area must be fully removed down to the tile substrate before epoxy can be applied. Mixing the two materials in adjacent joints also creates a visible inconsistency in sheen and texture, so partial epoxy repairs in a cement-grouted floor tend to look mismatched.
Published by Groutastic.
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