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

Interior Demi-Rustic Finish

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

A mid-texture clay finish at 4 to 5 mm. More aggregate movement than Smooth, more tonal variation, still an even plane at a distance. The most widely specified finish in the range.

Where it is used

Interior walls and ceilings in controlled interior environments Bathrooms and kitchens, outside wet zones and away from cooking splash zones

Substrates

Refer to the Clayworks Design Details data sheet for full substrate guidance

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
Applied thickness Top coat 4 – 5 mm
Coverage 2.6 m² nominal per 25 kg bag
Drying Approximately 51 – 72 hours
Colours 89 standard colours plus custom matching
Warranty 10 years manufacturer's warranty, subject to correct detailing, application and maintenance
Life expectancy 60 years, subject to correct detailing, application and maintenance
Application requirement Standard finishes: professional application. Custom finishes: specialist application.

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; also tested to ASTM E84 EN 13501, EN 15824, ASTM E84
Noise reduction coefficient 0.15 – 0.25 NRC depending on backing board BS EN ISO 354
Applied density 1682 kg/m³ — 10.1 kg/m² at 4–5 mm Clayworks data sheet
Impact Impact diameter < 15 mm BS EN 520
Thermal conductivity 0.84 W/mK Clayworks data sheet
Moisture buffer value 1.4 Clayworks data sheet
Light reflectance value 20.0 (purple) to 49.0 (pink) BS 8493:2008 + A1:2010
Embodied carbon 0.048 kg CO₂e/kg LCA stages A1–A3
VOC Trace VOCs; mineral and inert. Emission testing published by Clayworks Eurofins, EN 16516 / ISO 16000-6
Breathability Hygroscopic; buffers short-term humidity swings. The 40–60% figure is the manufacturer's, measured under test conditions — a finish moderates a room, it does not hold it at a set value Clayworks data sheet, EN ISO 12571
End of life Reusable, or returnable to earth once dried 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 for wet or shower areas Not for areas in direct contact with oils and fats, such as cooking splash zones Not suitable for floors, standard doors, or elements subject to frequent movement Custom finishes must be installed by an approved applicator
Specification clause

Clay plaster: Clayworks Interior Demi-Rustic Finish in colour [ref], top coat 4–5 mm over the primed substrate scheduled, to the approved sample panel. Reaction to fire Euroclass A1 to EN 13501 and EN 15824. Substrate preparation and junctions to the Clayworks Design Details data sheet. Applied by a Clayworks 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 · 5 pp · 1.1 MB
Download (PDF, 1.1 MB)

The rest of the

Smooth Finishes 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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