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Clay finishing plaster for natural wall surfaces
Clay finishing plaster is the natural finish for prepared walls: it creates a textured, mineral-based surface, remains vapour-permeable and is ideal as a topcoat or as a base for clay paint.
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What is clay finishing plaster suitable for?
Clay finishing plaster is the visible layer of plaster applied to flat, load-bearing substrates. It is applied to prepared wall surfaces or Clay base plaster and ensures the finished surface.
Typical applications:
- Top coat on clay base plaster
- textured, mineral-based wall surfaces
- Finishing plaster on suitable solid substrates
- Base for Deco clay facing plaster, Clay paint or Brushable clay plaster
Advantages of clay finishing plaster
Clay finishing plaster combines a natural look with a wall structure that makes sense from a building physics perspective:
- matt, mineral surface made of clay, sand and – depending on the type – chopped straw, for old buildings, new builds and renovation
- vapour-permeable and moisture-buffering
- contributes to a comfortable indoor climate and can help to prevent moisture damage
- stores heat and increases the comfort of the room
Which clay finishing plaster is the right one?
The most important decision: with or without straw.
Clay finishing plaster with straw is the classic choice for natural, textured surfaces. The chopped straw acts as a fine fibre reinforcement: it stabilises the render layer, enhances the bond and allows for thicker finishing plaster layers.
Clay finishing plaster without straw, such as the universal plaster conluto terra grob iis the more mineral-based alternative for people with sensitive skin, grass allergies or for long-term storage. It can be used as a finishing plaster and levelling coat in a layer thickness of 5–15 mm.
There is also Clay finishing plaster, earth-moist and Clay finishing plaster, dry. Earth-moist mix is ideal for larger areas and direct use on site. The dry mix is slightly more expensive, but offers greater flexibility: it can be mixed as required and, if stored in a dry place, has an indefinite shelf life.
Processing and surface
Clay finishing plaster is applied to a level, solid, clean and dry substrate. Depending on the desired finish, the surface is worked with a trowel, sponge board or rubbing board.
This rubbing-down process creates the characteristic mineral clay texture. At the same time, the surface is compacted and prepared for further finishing. If you wish to add colour, you can continue working with clay paint or clay render once the surface is completely dry.
The further build-up of the coating
Clay finishing plaster can be left as it is, with its finished, textured surface. If you want the wall to be finer, coloured or smoother, the appropriate next step should be taken once it has dried completely.
Useful options:
- Fine clay plaster for finer, smoother surfaces
- Premium clay finishing plaster for coloured clay surfaces without an additional coat of paint
- Clay paint for a matt, breathable colour scheme
- Brushable clay plaster for paint with a fine texture
- Clay skim coat for very smooth surfaces up to Q4
