MF-SG-01 · Revision A · Diamond Floor decorative surface system
Specifying Decora microcement
A continuous, hand-trowelled surface for considered interiors. Specify the complete build-up, from the existing substrate to the final protective sealer.
Choose the finish
Diamond Floor is marketed as microcement. Its technical data sheet describes a single-component decorative finish based on modified polyurethane resins in water with graded aggregates. This guide addresses interior applications using the Decora Diamond system. [1, 2]
| Application | Specification approach |
|---|---|
| Interior floors and walls | Schedule the room, traffic, finish and complete system. Confirm substrate suitability before pricing. |
| Bathrooms and shower surfaces | Project-specific assembly only. Coordinate waterproofing, falls, drainage, sealer and slip requirements before confirming use. |
| Joinery and benchtops | Require a stable support, edge details and a sealed sample. Confirm exposure to water, heat, oils and cleaning products. |
| Stairs and landings | Resolve nosings, edge protection, movement joints and the required slip performance with the designer. |
| Exterior, immersed or specialist use | Outside this guide. Obtain a written system recommendation for the proposed exposure. |
Set the visual benchmark
Specify colour, movement, texture and sheen through a physical sample. Require a larger site sample where raking light, a long wall or a broad uninterrupted floor makes variation important. Review the sealed finish under the intended lighting. Record acceptance before the main application.
A surface coating, not the structure
The decorative finish is a surface coating. The project must separately resolve structural movement, moisture management and any required waterproofing membrane.
Start with the substrate
Medida Forma proposes the following coordination requirements. The preparation method and component products must be confirmed for the actual substrate; acceptance of one area does not establish suitability elsewhere.
| Substrate | Preparation and acceptance |
|---|---|
| Concrete or cement screed | Review curing, surface strength, moisture and contamination. Mechanically prepare where needed, repair defects and agree the primer and levelling method. |
| Existing ceramic or stone tiles | Survey bond and stability. Remove loose areas; resolve hollow tiles, grout lines and contamination. Agree a compatible bonding and levelling treatment before coating. |
| Sheeted walls and wet-area boards | Obtain an approved board, framing, fixing and jointing detail. Confirm rigidity, fastener treatment and compatibility with the waterproofing and decorative layers. |
| Timber, plywood or framed floors | Require specific written acceptance of the complete floor assembly. Resolve deflection and an approved overlay; do not coat moving boards directly. |
| Existing coatings or membranes | Identify each layer and obtain compatibility advice. Complete an adhesion trial where required. Resolve the membrane-to-finish interface in writing. |
| Joinery substrates | Provide supported, stable construction with agreed corners and edges. Verify the proposed board and adhesive system for the intended exposure. |
Before work starts
Record substrate acceptance, completed repairs, moisture results, joint locations and levels at adjoining finishes. Obtain approval of the system schedule and sample. Allocate responsibility for defects and preparation outside the agreed coating scope.
Build the complete system
One continuous finish. Several coordinated layers.
- 01Protective sealerDecora Diamond Sealer in the published system
- 02Decorative finishDiamond Floor / Diamond Floor Fine as scheduled
- 03Preparation layerFloor Level and reinforcement where required
- 04Bonding treatmentDOC Primer or One Primer to suit the substrate
- 05Accepted substratePrepared concrete, masonry or other approved base
Manufacturer system concept, from exposed face to substrate. A project assembly may need additional layers. [1, 2]
| Published reference | Meaning for specification |
|---|---|
| Diamond Floor finish thickness | 0.80 to 1.00 mm in the D021 data sheet; this excludes preparation, levelling and sealer. [1] |
| Application environment | D021 states +5 to +35 °C and relative humidity below 85%. Observe all component limits. [1] |
| System selection | The manual identifies Floor or Floor Fine and a protective sealer. Final coat sequence and products require a project schedule. [2] |
Joints, wet areas and sealers
Show movement joints through the finish and resolve changes of substrate, drainage outlets, waterstops and penetrations before application. Establish the required slip performance for the actual sealed finish. Record the test evidence, not a rating borrowed from another coating. Any alternative base coat or sealer requires documented compatibility and clear responsibility for the assembled system.
Suggested specification clause
Copy into the project specification
Provide a complete Decora Diamond decorative surface system to the scheduled interior areas, installed by Medida Forma. Submit the substrate assessment, component schedule, current product data and a sealed physical sample before work. Include agreed preparation, bonding, levelling or reinforcement, decorative coats and protective sealer. Match the accepted sample for colour, texture, movement and sheen. Maintain designed movement joints and complete junctions to approved details. Coordinate wet-area waterproofing and slip requirements where applicable. Protect the finish through curing and provide care instructions at handover. Refer departures from the accepted system for written approval before substitution.
Project selection schedule
| Selection | Project information |
|---|---|
| Finish code / location | Project finish code, room and surface extent |
| Colour / sample | Supplier colour reference and approved sample ID |
| Substrate / preparation | Existing build-up, repairs and preparation responsibility |
| Base / decorative coats | Named components, reinforcement and coat sequence |
| Sealer / sheen | Named product, coats, texture and compatibility acceptance |
| Levels / junctions | Total build-up, transitions, joints and wet-area details |
| Performance / programme | Required slip evidence, curing and protection periods |
Care, handover and warranty
Care
Use a neutral, non-abrasive cleaner and soft cleaning equipment. The Decora manual advises water no hotter than 40 °C and excludes steam cleaning, aggressive acids, strong alkalis and brushing machines. Remove spills promptly. [2] Where another sealer is approved, issue its care requirements with the handover documents.
Handover
Provide the final system schedule, colour and sample reference, batch records, approved details, applicable test reports and product warranties. State when foot traffic, coverings, cleaning and water exposure may begin. Agree suitable protection with the installer before other trades return. Record any future inspection or resealing recommendation against actual use.
Workmanship warranty
Medida Forma installations carry a 7-year workmanship warranty covering delamination and other installation defects, provided the issued care instructions are followed. Structural movement in the building is not covered. Manufacturer product warranties apply separately.
Performance evidence
This guide assigns no generic slip, fire, acoustic or waterproofing certification. Submit evidence for the actual assembly wherever the project requires it. Confirm current technical instructions before tender or construction issue; product sheets and manuals can use different consumption and drying references.
Sources
- [1] Decora Diamond Floor D021 MTDS 021ENG, issued 1 September 2019; supplier-hosted copy.
- [2] Decora Diamond System Manual: system components, installation sequence and cleaning guidance.
- [3] Decora Diamond system overview: product family and current technical download links.
MF-SG-01 Revision A, 11 November 2026. This guide is not manufacturer certification or a project construction specification. Confirm current manufacturer instructions, and obtain evidence for the actual assembly, before tender or construction issue.
Talk to us about the specification.
Request physical samples, a showroom visit, a studio presentation or support with substrates, junctions and budget pricing for your project.