Terrazzo / Marble-Effect Epoxy Resin Floor

Both patterns use the same base: a two-component epoxy, meaning a resin and a hardener mixed just before pouring in the ratio the manufacturer specifies. The difference lies in how the pattern is made.

• Terrazzo effect: made with coloured chips, small pieces of plastic, stone or glass. The installer scatters them into the fresh layer and then seals them under another coat of epoxy. The pattern looks calm, hides small bits of dirt well and suits busy areas
• Marble effect: made by so-called live marbling. Several shades go into one layer at the same time, and the installer blends them into veins with a trowel or brush. It looks luxurious, but every flaw in a stroke shows, so it is the more demanding technique
• Metallic pigments: added when you want depth and a pearly sheen. They are often combined with marbling

Think about the light when you choose. The same pattern looks different in daylight and under spotlights. It is worth asking for a sample or a test patch and looking at it in the room itself.

1. Measure the moisture and strength of the subfloor and check for cracks.
2. Grind or plane the subfloor and remove old coatings, adhesives and grease.
3. Vacuum the whole area thoroughly with an industrial vacuum cleaner.
4. Apply a primer that evens out absorbency and strengthens the surface.
5. Repair cracks and uneven spots, levelling with a screed or filler from the same system if needed.
6. Respect movement joints around the edges and at thresholds, and mask walls, door frames and sills.
7. Mix the epoxy with pigments and pour the base coat, spreading it to an even thickness with a notched trowel.
8. Create the pattern: scatter the chips, or pour the colours and blend them into marble veins.
9. Go over the surface with a spiked roller to release air bubbles.
10. Once cured, apply a protective top coat in gloss, matt or anti-slip finish.
11. Leave the floor to cure and protect it from dust, moisture and loads.

You can usually walk on the floor after roughly 24 hours. Most manufacturers allow full loads such as furniture and rugs only after about a week. Pouring usually needs a room temperature of around 15 to 25 °C and relative humidity below roughly 75 %. The exact values are in the technical data sheet of the specific system.

In practice it often happens that a beautiful pattern starts peeling or cracking after a year. The fault is almost never in the epoxy but underneath it. Epoxy is a thin, rigid layer, so it faithfully follows every movement and every crack in the base.

• Concrete or cement screed: must be solid, dry and free of laitance, the weak, dusty skin on top. The system manufacturer sets the permitted moisture level, and it is measured before work starts
• Anhydrite (calcium sulphate) screed: sensitive to moisture and needs a suitable primer
• Old ceramic tiles: can often stay if they are firmly bonded. They are ground, the joints are filled and a primer for non-absorbent surfaces is used
• Timber and OSB subfloors: these move with moisture and temperature. A poured epoxy floor is not normally recommended on them unless the specific system explicitly allows it

If moisture can rise from below, for example in a cellar or an old house without a damp-proof membrane, it has to be solved before pouring. Otherwise blisters form under the epoxy. If you live in a flat, tell the building management or owners' association in advance, as grinding is noisy and dusty. If the work changes the floor build-up or touches structural parts, check with your local building authority what the local building regulations require.

• Condition of the subfloor: flat, dry concrete means less preparation, while old adhesives, bitumen left from parquet or cracks mean more work
• Shape of the room: a large rectangular area is easier to pour than a small hallway with many corners, door frames and a step
• Complexity of the pattern: single-colour terrazzo is simpler than multi-coloured marble with metallic veins or an inlaid logo
• Number of coats and type of top coat: an anti-slip or UV-stable top layer adds another working step
• Details: drains, a shower area, transitions to other flooring and skirting need time and precision
• Access and timing: if nobody can walk through the area while it cures, the work has to be split into stages

The usual mistake is skimping on preparation. Dust, grease or damp screed lead to poor adhesion, bubbles and peeling. Next comes inaccurate mixing. If the ratio of resin to hardener is off or the mix is not stirred well, soft and sticky patches remain that will never cure.

Unsuitable conditions cause problems too. In a cold, damp room epoxy sets slowly and the surface can turn dull or cloudy. If the spiked roller is skipped, tiny bubbles and pinholes stay in the floor. With marble, the pattern can look random, or a visible line can appear where two pours meet. A well-planned pouring sequence and enough people to pour the whole area in one go help here.

The last mistake is loading the floor too early. If you lay a rug or push furniture back too soon, you may end up with permanent marks.

When you take over the floor, look at it in daylight and also with a torch held low across the surface. Low-angle light reveals unevenness you will not see under normal lighting.

• The surface is continuous, with no bubbles, craters, dust specks or sticky spots
• The pattern matches the agreed sample in colour and in the density of chips or veins
• No visible line shows where separate pours meet
• Edges at walls, door frames and thresholds are clean, and no resin has run onto the walls
• Around drains and in the shower, water runs the right way and does not pool anywhere
• The top coat has the agreed level of sheen, with anti-slip finish where it was ordered
• The floor does not sound hollow when tapped
• You have received written instructions for curing, cleaning and care, along with the name of the system used