Specifying inorganic terrazzo: colour, aggregate and sample approval
Terrazzo is often chosen by colour, but the background, aggregate and finish need to be considered together. A useful specification identifies the material system and proposed format as well as the visual reference. Begin with those details before confirming quantity or a delivery schedule.
Identify the material system
Terrazzo can use different binders, including cement and epoxy. STONELYWOOD’s current terrazzo references are described as inorganic terrazzo with a cement binder and natural stone aggregates. Confirm the product specification for the reference and application you are considering.
Distinguish a supplied slab or precast component from a terrazzo system installed in place. Do not carry dimensions, installation details or performance information from one system into another without checking that they apply.
Describe the background and aggregate
Include the product name or a visual reference, then describe what matters to your design: the background colour, aggregate colours, relative chip size and the overall visual density. Mark any aspect that must remain consistent across adjoining components.
For the first inquiry, annotated images can explain the direction more clearly than colour words alone. Use them to request a review, then confirm the appearance against an agreed physical sample where available.
State the format, thickness and edge requirements
List the intended component type, dimensions, thickness and quantity. Identify whether you are asking about slabs, cut pieces or a more complex fabricated form. Include edge profiles, openings and adjoining materials where relevant.
The selected reference does not establish that every format or edge detail is available. Ask for those requirements to be checked and reflected in the quotation before treating them as part of the specification.
Make sample approval specific
Request a sample representing the proposed material and finish, and ask how it relates to the intended production. Record the sample reference, finish and the date of approval.
Review the sample alongside the other project materials under the intended lighting. Note the aspects approved and any appearance range still to be agreed. A photograph of the sample is useful for records but should not replace the sample itself when making a colour decision.
- Material and product reference
- Background and aggregate appearance
- Finish and any proposed surface treatment
- Sample identifier and agreed approval notes
Ask for application-specific information
Tell the supplier where and how the material will be used. Request relevant technical information and ask the responsible project professionals to review support, fixing, joints and installation details for that location.
Confirm the care instructions for the chosen binder and finish. Do not infer wet-area suitability, outdoor suitability or slip performance from the name “terrazzo” or from its appearance.
Bring the selection into the quotation
Send the item schedule, drawings, sample requirements, destination and arrival date together. Identify whether sampling and approval need to happen before the production schedule can be confirmed.
The final quotation should refer to the agreed material, finish, component dimensions and quantities. Confirm packing, delivery terms and any required documentation as part of the same scope review.
Further reading: National Terrazzo & Mosaic Association: material systems and specifications