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

Cemher Claywash

Clay paint

Manufacturer Cemher
Country of origin Spain
System family Clay plaster
Supplied and applied by Conmarble Natural Finishes

The product

A one-component clay paint for internal walls and ceilings, brushed on in two coats. Specified where a clay surface is wanted at paint thickness rather than plaster thickness.

Where it is used

  • Internal walls
  • Internal ceilings

Substrates

  • Prepared internal wall and ceiling substrates

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.

Type One-component paint, white powder
Coverage 3.5 L covers 20 m² in two coats
Coats Two
Application method Natural bristle block paint brush
Minimum application temperature + 10 °C
Packaging 2 kg powder

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
Thermal conductivity 1.40 W/mK UNI EN 12664:2002
Adhesion strength > 4 N/mm², Class B UNI EN 13892-8:2003 / UNE EN 13813:2014
Reaction to fire Class A1 UNE EN 13501-1:2019
VOC emissions < 1 g/L ASTM D2369 / SCAQMD
Indoor air quality Low VOC, A+ indoor air quality Cemher data sheet
Other properties Breathable, highly flexible and crack resistant Cemher 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.

  • Interior use only
  • A paint film, not a plaster — it does not provide the mass, acoustic or buffering performance of a clay plaster
  • Minimum application temperature +10 °C
Specification clause

Clay paint: Cemher Claywash in colour [ref], applied in two coats by natural bristle block brush to internal walls and ceilings scheduled, coverage 3.5 L per 20 m² in two coats. Reaction to fire Class A1 to UNE EN 13501-1:2019. Minimum application temperature +10 °C.

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.

The rest of the clay plaster range

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 Exterior Rustic Finish Mineral exterior finish Tadelakt Hydraulic lime tadelakt Light Reflectance Values LRV data set, natural clay plasters

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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Delivered projectsWhere this system is already installed.The specification hubEvery product, family and document in one place.Upload a scheduleSend a finishes schedule or bill of quantities for review.See it in personEvery range on real walls, by appointment.