The product
The closest, flattest finish in the Clayworks range: two 1 mm layers to a 2 mm total. It reads as a matt, even, hand-worked plane with the colour running through the body of the material.
Where it is used
- Interior walls and ceilings
- Fixed furniture
- Bathrooms and kitchens, outside wet zones
Substrates
- Gypsum plasterboard
- Masonry and blockwork
- Wood fibre board and wood wool carrier board
- Gypsum backing board, suitably primed
- Other substrates may require a backing coat — refer to Clayworks Design Details
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.
| Supply | 25 kg bags of dried plaster |
|---|---|
| Applied thickness | 2 mm total, in two 1 mm layers |
| Coverage | 7 – 8 m² per 25 kg bag |
| Drying | 2 – 3 hours between layers; 24 hours for the whole finish |
| Colours | 88 standard colours, custom on request. UV resistant, through-pigmented. |
| Storage | Keep dry, do not pierce bags; retain surplus in sealed containers for repairs |
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 |
|---|---|---|
| Reaction to fire | Euroclass A1 | EN 13501 and EN 15824 |
| Noise reduction coefficient | 0.10 NRC; sound absorption coefficient 0.090N | BS EN ISO 354 |
| Thermal conductivity | 0.84 W/mK | Clayworks data sheet |
| Moisture buffer value | 1.28 | Clayworks data sheet |
| Impact | Impact diameter < 15 mm | BS EN 520 |
| Applied density | 1270 kg/m³ — 2.5 kg/m² at 2 mm | Clayworks data sheet |
| Light reflectance value | 37.5 (Blue) to 60.5 (White) | BS 8493:2008 + A1:2010 |
| Embodied carbon | 0.0677 kg CO₂e/kg | LCA stages A1–A3 |
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.
- Cannot be applied directly onto wood, including plywood, MDF or OSB
- Not suitable for floors
- Appropriate for bathrooms but not wet or shower areas
- Not advised on doors or items that will be moved
Clay plaster: Clayworks Smooth Finish in colour [ref], applied 2 mm in two 1 mm coats over Clayworks Wall Primer on the substrate scheduled, to the approved sample panel. Reaction to fire Euroclass A1 to EN 13501 and EN 15824. Applied by an approved applicator.
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.
-
Smooth Finishes Clay plaster · Technical data sheet · 4 pp · 0.7 MBDownload (PDF, 0.7 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.