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Sand Microtadelakt arches in the grand atrium of the Calligraphy Museum, Madinah
Lime plaster — technical data

Microtadelakt — four grain sizes

Lime-based plaster, four grain sizes

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

The product

The four-grain system sheet, declared to UNE-EN 13813. Base builds and levels, Medium and Regular carry the finish, Fine closes the surface. Selecting the right grain per coat is what produces the sheen the drawings show.

Where it is used

  • Interior and exterior walls and ceilings
  • Furniture, shelves, countertops and counters
  • Over underfloor heating and fireplaces
  • Over old ceramic tile coverings
  • Kitchens, bathrooms and terraces

Substrates

  • Concrete and cementitious mortars
  • Ceramic
  • MDF
  • Plaster and plasterboard

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.

Declared to UNE-EN 13813
Grain sizes Fine · Regular · Medium · Base
Consumption Fine 2 m²/kg · Regular 1.7 m²/kg · Medium 1.7 m²/kg · Base 1 m²/kg
Water ratio Fine 10 kg : 4 L · Regular 10 kg : 4 L · Medium 20 kg : 6.5 L · Base 20 kg : 5 L
Applied thickness 1 – 4 mm total
Between coats 4 hours, sanded at 40 or 80 grit; 3 hours for wet-on-dry work
Finish techniques Wet-on-wet marble effect (high sheen), wet-on-wet (medium sheen), wet-on-dry (low sheen)
Pot life 3 hours at about 20 °C
Data sheet edition Last edited 23/10/2023

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
Emissions into indoor air A+ UNI EN ISO 16000-6:2019 / UNE EN 16516:2018
Thermal conductivity 0.46 W/mK UNI EN 12664:2002
Reaction to fire Class A1 / A1FL UNE EN 13501-1:2019
Adhesion strength > 4 N/mm², Class B 4.0 UNI EN 13892-8:2003
Impact resistance > 18.5 Nm, IR 18 UNI EN 6272-2:2012
Surface hardness > 200 N/mm², SH 200 UNI EN 13892-6:2003
Compressive strength > 40 N/mm², Class C40 UNI EN 13892-2:2005
Abrasion resistance (BCA) Class AR 0.5, max 50 µm UNI EN 13892-4:2003
Slip resistance USRV 41, Class 2 UNE EN 12633:2003
Water vapour transmission Class 1, Sd < 5 m UNE EN ISO 7783-2:2012

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.

  • Do not apply below 10 °C
  • Not over electric underfloor heating
  • Sealer required — figures marked 1* are without sealer
  • Floors require fibre mesh before the first coat
Specification clause

Lime plaster system: Cemher Microtadelakt to UNE-EN 13813, grain sizes selected per coat — Base for build, [Medium / Regular] for finish coats, Fine where the closest surface is scheduled. Total applied thickness 1–4 mm over Primer 100. Fibre mesh before the first coat to floors. Sealed to the sealer specification.

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 lime plaster range

Cemher Microtadelakt One-component lime plaster Cemher Microtadelakt Thick Base Lime-based plaster for high build

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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