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

Light Reflectance Values

LRV data set, natural clay plasters

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

The product

The measured light reflectance value of every standard Clayworks colour, across Smooth, Demi-Rustic, Rustic and Tadelakt. Needed for visual contrast checks and for daylight and lighting calculations — the same colour reads differently at different textures.

Where it is used

  • Visual contrast checks between adjacent surfaces and against door and ironmongery finishes
  • Daylight and artificial lighting calculations
  • WELL and accessibility submissions where surface reflectance is scheduled

System family

An unfired clay plaster, pigmented through the body, applied by hand over a primed substrate. It is a finish, not a waterproofing layer: it breathes, buffers humidity and is repaired rather than replaced. Interior walls and ceilings only.

The clay plaster system

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.

Scope Full standard colour range, four finishes
Range Approximately 5% to 63% across the set
Format Colour reference against LRV per finish

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
Test standard Tested to BS 8493:2008 + A1:2010 BS 8493:2008 + A1:2010
Smooth range 37.5 (Blue) to 60.5 (White) Clayworks Smooth data sheet
Demi-Rustic range 20.0 (purple) to 49.0 (pink) Clayworks Demi-Rustic data sheet
Rustic range 24.6 (Grey) to 40.1 (Green) Clayworks Rustic 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.

  • LRV varies with texture — the same colour reference gives a different value in Smooth, Demi-Rustic, Rustic and Tadelakt
  • Values are measured on sample panels; confirm against a project mock-up where the tolerance is tight
Specification clause

Light reflectance values for all scheduled clay plaster colours to be confirmed against the Clayworks LRV data sheet, tested to BS 8493:2008 + A1:2010, and verified on the project sample panel before finishes are frozen.

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 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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