The product
A hydraulic lime, quartz sand and marble powder plaster, burnished and treated with polishing soap to give a water-repellent, seamless surface. Specified for bathrooms and humid rooms — with the maintenance regime written into the O&M.
Where it is used
- Decorative surfaces in areas exposed to water or high humidity
- Bathrooms, hammams and wet rooms, with the after-soaping regime maintained
- Interior walls
Substrates
- Moisture-resistant plasterboard, joints taped and filled, with 12 mm plywood backing and studs at 300 mm centres
- Fermacell, joints taped and filled, studs at 300 mm centres
- Tile backing board with a Stonefix or similar backing coat system, mesh embedded
- Blockwork, masonry and others — suitability confirmed by the approved plasterer
- Refer to Clayworks Design Detail DD20
Application data
Coverage, thickness, mix and cure, as declared by the manufacturer. Site conditions in the Gulf sit at the top of most of these ranges — allow for it in the programme.
| Composition | Hydraulic lime, quartz sands, marble powder, clay, methylcellulose |
|---|---|
| Coverage | Approximately 10 m² per 25 kg bag |
| Drying | Dry after 2 – 3 days at 3 mm layer thickness |
| Curing | Treat gently for the first 3 months; final hardness at approximately 6 months |
| Pot life | Mixed material must be used within 8 – 10 hours |
| Storage | Powder keeps at least 12 months in dry, airtight containers |
| Application | An approved Clayworks plasterer for all applications |
Performance data
Every figure below is reproduced from the manufacturer's own technical data sheet, with the test standard it was measured against. The sheet itself is in the download section.
| Property | Result | Standard |
|---|---|---|
| VOC declaration | Contains max. 1 g/L VOC against a Cat. A/b limit of 100 g/L | ChemVOCFarbV (2010) |
| Water behaviour | Water resistant; water repellent when treated with polishing soap | Clayworks data sheet |
| Composition class | Purely mineral, cement free, breathable, emission free | Clayworks data sheet |
| Maintenance regime | After-soap every 1 – 2 months in wet areas with diluted polishing soap, then polish | Clayworks data sheet |
| Cleaning | Water with 1 – 2 spoons of Marseille soap per 8 litres, soft sponge only | Clayworks data sheet |
| Repair | Cut out the full layer along the damage and reinstate with original material | Clayworks data sheet |
Where not to use it
The limits are as much a part of the specification as the performance. Everything here is stated on the manufacturer's data sheet.
- Not completely impermeable; some deep-textured custom finishes are not water resistant
- Not recommended for wash basins and bathtubs that are constantly wet
- Not suitable for floors, or behind a cooker or stove — oils and fats stain irreversibly
- Not suitable on continuously moist substrates
- Not acid resistant — citrus, wine and vinegar will damage the surface
- Not covered by the Clayworks clay plaster certifications and data sheet publications
Tadelakt: Clayworks Tadelakt in colour [ref], applied to the substrate scheduled and detailed to Clayworks Design Detail DD20, burnished and treated with polishing soap to the approved sample panel. Moisture-resistant plasterboard with 12 mm plywood backing and studs at 300 mm centres where plasterboard is used. Applied by an approved Clayworks plasterer. After-soaping regime at 1–2 month intervals to be included in the O&M manual.
Square brackets mark the choices that belong to the project. Send us the finishes schedule and we will return the clause completed, with the sample and mock-up programme against it.
Documents
Every document is the manufacturer's own, reproduced in full and unaltered under our cover. Free to download, no form.
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Tadelakt Clay plaster · Technical data sheet · 6 pp · 1 MBDownload (PDF, 1.0 MB)
The rest of the clay plaster range
Technical support for the design team
We supply the material and we apply it, so the specification and the workmanship sit with one party. Send a finishes schedule, an elevation or a mood board and we will come back with the system, the build-up, the sample programme and a completed clause.