There are several different options when considering terrazzo. The concrete or epoxy binding material can be pigmented, allowing for a limitless range of color options, and other interesting aggregates can be used such as chips of glass, metal, mother of pearl or abalone shells.
Here is a brief overview of the three main in situ pouring methods:
Thinset Terrazzo
This is a layer of epoxy-resin terrazzo, about 3/8 thick, poured over a concrete substrate. It is the lightest type of terrazzo in weight and can be installed over existing concrete or a plywood subfloor; it has the greatest range of color choices and is least likely to crack (because the epoxy resin increases flexibility). However, it can only be used indoors as the top layer can peel away if exposed to too much light. Also note that the solvents used in the epoxy can cause allergic reactions for some people.
Sand-Cushion Terrazzo
This is a more traditional method for terrazzo where an initial cement base is laid, then a layer of sand applied before pouring a cement based terrazzo mix on top. The sand layer allows for some movement, minimizing the potential for cracks; however, this method create a very heavy and thick floor, and is only suitable for new builds as you have to incorporate the concrete base during construction. This method is also only for interior floors.
Monolithic Terrazzo
Here a cement based terrazzo is poured straight onto a concrete subfloor. This method can be used for both interior and exterior applications, and on top of existing concrete subfloors – provided they are level and in good repair. However, this method is not the best for dealing with potential cracking – especially for above grade installation – mostly ideal for single-storey, ground floor buildings.
Terrazzo Tile Flooring
Finally, using terrazzo tiles is another way to install terrazzo in your home. installation involves applying an adhesive and grout system, much like ceramic or porcelain tiles. Specialist installers can apply a sanded and sealed finish to create a seamless look similar to poured terrazzo.