Clay plaster in Hamburg – natural interior plaster for a healthy indoor climate

Benefits of clay plaster

• Humidity-regulating – buffers moisture, e.g. in bedrooms and living rooms
• Vapour-permeable – compatible with timber, half-timbering and historic masonry
• Natural – free of solvents and synthetic resins, reusable
• Pleasant surface – from finely smoothed to textured, also coloured as clay finishing plaster

Where clay plaster fits

Clay plaster suits living rooms, bedrooms, offices, stairwells and attics. It bonds to masonry, clay boards, wood-fibre boards and many other substrates – with a plaster base or primer depending on the substrate. It is not suitable for permanently wet areas such as showers; there we use lime-cement plaster.

Process

1. Assess and prepare the substrate, plaster base or primer if needed
2. Clay base coat, reinforced with mesh where required
3. Let it dry – clay hardens by drying, good ventilation matters
4. Finishing coat – finely smoothed, felted or as coloured finishing plaster
5. Optional clay or casein paint as a finish

Combined with interior insulation

Clay plaster combines well with wood-fibre or clay boards and is therefore suitable for vapour-permeable interior insulation in older buildings. More on interior insulation with mineral plaster under Insulating plaster.

Frequently asked questions