Lime plaster on gypsum plaster

During renovation, the redesign of a wall surface can be implemented in various manual processes. Covering an existing gypsum plaster is not always possible. Depending on the desired surface, the old gypsum plaster must first be completely removed.

Lime plaster and gypsum plaster in comparison

Lime plaster is up to 30 percent more expensive than gypsum plaster. It is able to absorb pollutants and balance the indoor climate. It has a mold-inhibiting and antibacterial effect. It is particularly suitable for damp rooms such as the bathroom and kitchen and can even be used in the laundry room. Compared to gypsum plaster, it requires a longer drying phase. It is more difficult to work with and has to be applied in two layers. Gypsum plaster can be plastered in one layer.

  • Also read - felting gypsum plaster
  • Also read - recognize gypsum plaster
  • Also read - remove gypsum plaster

Lime plaster for indoor use

An ideal indoor climate is achieved with lime plaster. Lime is very alkaline. This prevents the formation of mold. It regulates the humidity. It absorbs high levels of moisture and releases it again when the air is very dry.
Lime plaster is used in the living area in the following rooms:

  • Baths, guest toilet
  • basement, cellar
  • living rooms
  • bedroom
  • nursery
  • Kitchen and dining area
  • House entrance, hallways

Gypsum plaster unsuitable as a substrate

Wherever plastered walls are to be repaired and beautified as part of a renovation, the appropriate wall plaster must be selected. An existing gypsum plaster surface should not be plastered over with lime plaster. The following rule of thumb applies to plastering work: The substrate must be harder than the plaster layer to be applied. Gypsum plaster is softer than lime plaster. Cracks appear in the drying process. The lime plaster contracts slightly. Tensions arise between the gypsum plaster substrate and the lime plaster. The lime plaster separates from the gypsum plaster. If a wall is to be treated with lime plaster, the old gypsum plaster must first be removed.

Tips & Tricks The positive properties of lime plaster are retained if its surface is treated accordingly. The lime plaster surface must not be sealed with latex, wallpaper, tiles or emulsion paint. Only then does the lime plaster retain its diffusion openness and can regulate the room climate.