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Demi Rustic Clayworks clay plaster on the spiral stair at Villa 515, Dubai
Clay plaster — technical data

Smooth Finishes

Natural clay plasters

Manufacturer Clayworks
Country of origin United Kingdom (Cornwall)
System family Clay plaster
Supplied and applied by Earth Layers by Conmarble

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.

PropertyResultStandard
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
Specification clause

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.

TECHNICAL DATA SHEET · 4 pp · 0.7 MB
Download (PDF, 0.7 MB)

The rest of the

Interior Demi-Rustic Finish Natural clay plasters Interior Rustic Finish Natural clay plasters Exterior Demi-Rustic Finish Mineral exterior finish Exterior Rustic Finish Mineral exterior finish Tadelakt Hydraulic lime tadelakt Light Reflectance Values LRV data set, natural clay plasters Cemher Claywash Clay paint

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.

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