In Opera Group's guide on


This is intended as a rough guide and based on standard production at the time of writing. Bespoke or smaller production run details and materials may vary.

For specific technical enquiries, please contact the In Opera Technical team.

What is terrazzo?

Terrazzo is made by mixing stone, marble and granite together with a binding agent. Its traditional ingredients are cement mixed with marble powder and an aggregate material.
In everyday language, the term ‘terrazzo’ is used to define various marble and stone agglomerated materials, including the ones with cement, resin, or epoxy binders. However, cement is the traditional binding agent used for terrazzo blocks. And in the EU, the technical standards of the material and their legal implications are determined around this type of terrazzo only.

Terrazzo is commonly used for indoor flooring, but the possibilities are much broader, it can be used for interior or exterior wall cladding, furniture surfaces and a wide range of landscaping applications for commercial or domestic projects.

When it comes to choosing terrazzo, it is essential to understand the methods and process of producing terrazzo to get the most out of the material’s possibilities, both technically and aesthetically.

Stone pile 5
Stage 1


A. Mining marble and stone chips

Marble and other quarry waste material are extracted and taken to aggregate processing plants.

B. Stones are processed by colour

Boulders and stones of different types and colours are processed separately, thus preserving the original colour of the natural material.

C. Sorting by size

Boulders are crushed into ‘stone chips’, aka aggregates of various sizes.

D. Granulating

The crushed aggregates are passed through sieves of various grades that categorises them into standardised sizes. Larger aggregates are used as terrazzo stone inserts, whereas the finest sand and dust granules make up the main component of the terrazzo base.

E. Cleaning

Chips are washed thoroughly to get rid of dust and other unwanted particles. This prevents dust contamination between different coloured stones.

Stage 2


Any terrazzo design follows a strict recipe with a precise ratio between stone granules, chips, binders and other ingredients.

A. Mixing & Moulding

Terrazzo components, which are stored separately in hoppers, are loaded into large containers. They are taken into a vacuum environment, where the ingredients are mixed, poured into metal moulds for terrazzo blocks. This prevents any air bubbles contaminating the final terrazzo material.

Finally, the terrazzo mixture is vibrated and left to settle in a vacuum in order to remove the remaining unwanted air bubbles.  The process is fully automated and precisely navigated from the control room.

B. Settling and Curing

The block is cured for 28 days for the material to fully solidify. After which, it can be cut into slabs or many other solid custom shapes.

Technical information

Product code: MSCA SB


Cement is the traditional material used for terrazzo, and in the EU, the standards of the material are often determined around this type of terrazzo.

Standard terrazzo ingredients:
- approx.10-15% white cement, used as a binder;
- mixed with white Carrara powder, aka Calcium Carbonate.

MSRA13 Verde Alpi
Product code: MSRA


It is a precast material composed of marble chippings bonded together with special resins and pigments.

It consists of 93% marble chipping and just 5-7% of the resin binder.
The tiles are thinner, thus, lighter in weight than terrazzo cement.

Stage 3


Blocks can be cut into slabs, as well as carved into custom shapes, making terrazzo blocks suitable for creating custom landscaping features or large decorative objects, such as furniture or sculpture.

A. Cutting blocks into slabs

The cured block is cut into slabs using a gang saw. The saw has a large number of parallel blades, cutting at the same time. To cut a single block into slabs, it takes around 4 hours. 

Water is used to keep the blades cool and dust-free. Terrazzo factories mainly use rainwater for the cutting process, after which the water gets filtered and recycled throughout the rest of the slab preparation process.

B. Polishing

The slabs are put through a polishing machine which can be adjusted to achieve various finishes to meet specific project requirements.

C. Treatment

The slab is treated with an impregnating sealer that helps to protects the terrazzo from staining.


Exchange Square in London, EC2A, is assembled from over 3000 unique terrazzo pieces, cut from block.


These modular benches were assembled from terrazzo slabs of various colours in order to create this unique design. The patterns and shapes reference the maritime signal flags - an internal code system used to communicate with ships. Together the benches make up a 'coded' text, which spells out 'Royal Docks' across its length.
Stage 4


A. Cutting & Shaping

Ready slabs are cut into smaller-sized tiles. Slabs can also be cut in any other geometric shape to create intricate design features.

B. Rectification & Polishing

The edges of the tiles are rectified through a honing process to ensure the accuracy of the final material size and dimensions.

Individual tile pieces are calibrated to achieve an accurate thickness and surface texture.

C. Quality control & Packaging

Each tile goes through manual quality checks. After which, the tiles are packaged and made ready to be shipped to clients.

Standard size guideline

*Each block and slab vary in size depending on the type of material. Please consult our technical team for further info.
All products


Both cement and resin agglomerate terrazzo blocks can be carved into any custom shapes and forms of any size and for any purpose.
Dedicated team for Technical and Design consultation

Supporting architects & designers
on every step