Epoxy or cement grout: zone selection guide for your project

By Osman Orman · Tile and technical specialist at Tegelmonsters

A simple main rule applies to the choice between epoxy and cement grout: epoxy grout is suitable for wet, heavily loaded, and hygienically critical zones, while cement grout is suitable for regular interior spaces. Epoxy grout is waterproof and chemically resistant, while cement grout is cheaper and easier to work with.

The trade-off is not about right versus wrong. It revolves around the load on the space, the budget, and the craftsmanship in the execution. Both joints perform excellently, as long as you use them in the right place.

Selection framework

Do you choose epoxy or cement grout for your project?

A joint is more than just filling between two tiles: it is the place where moisture, dirt, and cleaning agents first take hold. Therefore, the grout material partly determines how long a floor or wall remains looking pristine. The material is independent of the joint width; that is a separate choice based on size and zone, as we explain in our explanation of joint width per zone.

The two joint types differ on a handful of points that matter in practice. The table below places them side by side, just as a project team weighs them against each other.

The table shows that neither wins on every point. Epoxy is strong on moisture and chemistry, while cement excels in price and convenience. In practice, project teams therefore often choose by zone, rather than for the entire building at once. We will elaborate further on exactly how to make that zone choice, room by room.

Material & standard

What is the difference between an epoxy grout and a cement grout?

The European standard NEN-EN 13888 divides grouting mortars for ceramic tiles into two main groups. Cementitious grouting mortars fall under the designation CG. Reactive resin grouts, which include epoxy, are designated RG. These letters appear literally on the packaging, so that a tiler immediately sees which type he is working with.

Within the cement group, CG1 exists as the basic class and CG2 as the improved class. A CG2 joint can bear two additional designations. The letter W stands for lower water absorption, and the letter A for higher wear resistance. However, a cement-based joint always remains slightly porous, even in the best class.

Reaction class RG works differently. An epoxy grout, or reaction grout, consists of two components: a resin and a hardener. After mixing, a chemical reaction occurs in which the mass hardens into a dense, virtually non-porous whole. As a result, the grout absorbs hardly any water, and dirt and lime adhere poorly to it.

Water absorption indicates how much moisture a joint absorbs. A cement joint absorbs water to a limited extent and can therefore darken over time or trap dirt in heavily used areas. An epoxy joint, on the other hand, remains sealed and retains its original color longer. The most frequently asked question our team receives concerns precisely this distinction, often in combination with the choice of joint color.

Performance

How do water, stain, and chemical resistance differ?

The clearest distinction lies in water resistance, as epoxy grout absorbs virtually no moisture, giving mold and dirt little grip. Cement grout is water-repellent, but in a constantly wet environment, moisture can slowly seep in. In a shower floor or around a swimming pool, that difference adds up over the years.

Chemical resistance is the second distinction, and here too, epoxy grout is resistant to most acids, greases, and industrial cleaners. Cement grout can be slightly affected over time by acidic cleaning agents. Anyone who chooses the right cleaning products will keep both types of grout looking good for longer, as we describe in our article on cleaning tiles.

Hygiene is the third factor, and it counts especially in the food sector. In a room where food is prepared, floors and walls must be easy to clean, without seams or crevices where dirt accumulates. The NVWA's HACCP requirements therefore align well with a sealed, non-porous epoxy grout. For an industrial kitchen, this is often the decisive reason.

The index illustrates what the table already indicated. Epoxy leads in water resistance and chemistry, while cement leads in workability and price. For a regular living room or bedroom, the first two properties are rarely critical, making cement grout a logical and economical choice there.

Costs & processing

How much does an epoxy grout cost and how do you apply it?

The additional costs of epoxy lie in two areas, as the material itself is already more expensive per kilo. Additionally, application takes more time because the tile surface must be thoroughly cleaned immediately after grouting. On balance, cement grout is cheaper and more forgiving: you have more time and minor corrections are simple.

With epoxy, the application is the real focus, because as soon as the resin and hardener are mixed, the reaction starts immediately. The grout must be set and the surface clean within approximately 30 to 45 minutes. If material remains on the tile, it hardens into a haze that is difficult to remove. A flat, well-prepared substrate and an experienced tiler make all the difference here.

For that reason, epoxy is primarily a project decision and less of a side job. In larger projects, the longer lifespan and lower maintenance often outweigh the higher installation costs. In the projects handled through us, we see that teams prefer to make that trade-off with the tile and grout physically side by side.

Consideration

Is an epoxy grout better than a cement grout?

Color stability is a good example of that nuance, as an epoxy grout remains uniform in color indoors for years. Under strong, prolonged UV exposure, some light epoxy types may discolor slightly outdoors. Cement grout is available in many colors and provides a natural matte appearance that designers actually prefer in certain projects.

In the long run, an epoxy grout remains sleek and requires little maintenance. A cement grout requires a bit more attention, but performs well once protected. The question, therefore, is not which grout is best, but which suits the load and the budget. The table below helps make that assessment.

Per zone

When do you use epoxy grout and when cement grout?

Heavily stressed wet areas call for epoxy, because around a swimming pool there is constant water and chlorine, and in an industrial kitchen, grease and hot cleaning come together. In such places, the dense, chemically resistant joint is the safe foundation. In the food sector, this aligns with hygiene requirements that mandate seamless cleanability.

For wet rooms in general, the Building Decree sets requirements for the watertightness of floors and walls. These requirements apply to the entire structure, not just the joint, although a sealed joint does contribute. In a shower room that is used daily, epoxy is therefore a strong choice.

The situation is different in regular interior spaces. A living room, bedroom, or hallway is dry and subject to light traffic. In these areas, cement grout is technically fine and considerably cheaper. However, if you want extra protection against moisture and stains in a standard bathroom, there is a middle ground: cement grout that you protect with an impregnating protector after curing.

The joint material is independent of the joint size and movement in the floor. You determine the joint thickness based on size, as explained in our explanation regarding joint thickness . Additionally, on large surfaces, an expansion joint remains necessary to accommodate movement, regardless of which joint type you choose.

Both grout types work with underfloor heating, provided the product is suitable for heat exchange. A reactive grout is naturally flexible; for a cement grout, you should choose a suitable class. We explain the combination with underfloor heating in our article on tiles and underfloor heating . This is how you match the grout type to the rest of the floor structure.

Sample package

How do you put together a sample pack for your project?

On the tiles page , you can filter for free by zone, size, color, and finish. Select the application page there that matches the focus of the design. For each zone, you can immediately see which collections are in stock and which we can send as a sample.

With the Monstermap tool on tegelmonsters.nl, you bundle tiles by project and keep track of the selection centrally. This is especially helpful when multiple zones are involved in the process simultaneously. You combine floor and wall tiles and share the selection with your client before the samples are delivered.

In the projects handled by us, we see that an initial filtering round is completed online, followed by a physical assessment in our showroom in Utrecht. This keeps the sample request process accessible, and the showroom appointment serves as a targeted in-depth look. The showroom is accessible to professionals by appointment only.

Frequently asked questions