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

Exterior Rustic Finish

Mineral exterior finish

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

The product

The coarser of the two exterior grades. Same three-coat build-up and same cure, with the aggregate more fully expressed in the top coat.

Where it is used

Exterior walls and facades Elevations where a heavier texture is wanted Where a seamless match to an interior rustic finish is required

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
Stipple coat 4.5 m² per 25 kg at 3 mm
Base coat 1.6 m² per 25 kg at 8 mm
Top coat 1.6 m² per 25 kg at 8 mm
Drying Approximately 2 months
Composition Mineral-based binder with graded aggregates, minerals and natural pigments
Colours 89 standard colours plus custom matching
Warranty 10 years manufacturer's warranty
Life expectancy 25 years +, subject to correct detailing, application and maintenance

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
Thermal conductivity Approx. 0.83 W/mK Clayworks data sheet
Vapour permeability Vapour permeable; supports moisture movement through the wall build-up Clayworks data sheet
Light reflectance value Available on request Clayworks data sheet
VOC No added VOCs 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 suitable for floors or horizontal walking surfaces Not for permanently saturated conditions or areas subject to standing water Junctions, copings and drainage need careful design Custom finishes must be installed by an approved applicator
Specification clause

Exterior mineral finish: Clayworks Exterior Rustic Finish in colour [ref], applied as a 3 mm stipple coat, 8 mm base coat and 8 mm top coat over the substrate scheduled, to the approved sample panel. Reaction to fire Euroclass A1 to EN 13501 and EN 15824. Allow approximately two months' cure. 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 · 1.2 MB
Download (PDF, 1.2 MB)

The rest of the

Smooth Finishes Natural clay plasters Interior Demi-Rustic Finish Natural clay plasters Interior Rustic Finish Natural clay plasters Exterior Demi-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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