Plasters and room climate

The plaster used can have a huge impact on the indoor climate. In the opposite case, they can also dramatically worsen the health of your home. Which plasters are best suited for a good living climate, and how plasters can influence the indoor climate, read here.

Mineral versus synthetic resin plasters

Resin plasters are used in many cases. But they have some distinct disadvantages compared to mineral plasters:

  • they are diffusion-tight
  • they can release pollutants into the room air
  • they are not moisture regulating
  • they are not odor-controlling

Diffusion tightness

Mineral plasters are permeable, meaning they allow moisture to escape. Resin plasters, however, do not allow diffusion. They are like a rubber skin that seals the wall waterproof.

This is neither favorable for the building substance, nor for the indoor climate.


Synthetic plasters can release a large number of hazardous pollutants into the room air. Considered particularly dangerous:

  • softener
  • dispersant
  • monomers

Other substances, such as volatile organic compounds, may be included in certain synthetic resin plasters.

When these substances are released into the air, the human body constantly absorbs them. This cumulative effect can be detrimental to health in many cases.

Lack of moisture regulation

The humidity in enclosed areas may fluctuate. Some mineral plasters, such as lime plaster, can absorb the excess moisture from the air and release it again.

The humidity in the room is thereby regulated and kept constant. This ensures a very pleasant living environment.

Lack of odor-binding ability

Mineral plasters are able to bind odors (kitchen odors, other malodors) and, to a lesser extent, pollutants from the room air. This feature does not have resin plasters.

Natural mineral plasters

Even with mineral plasters harmful substances may be mixed under certain circumstances. Natural mineral plasters do not contain such harmful substances. They are clearly best for an optimal indoor climate.

lime plaster

Lime plaster was very popular as interior plaster until the early eighties. Because of the high cost, however, lime plaster was used later. It was not machine-suitable at first, and required two-shift application between which a dry season was required.

Today, however, modern lime plasters are just as efficient to apply as other mineral plasters. In addition to the moisture-regulating effect, they also have the advantage that they are toxic to mold. On lime plaster no mold can flourish.

Because of their excellent effect on the living climate lime plasters are again very popular today.


Red lime is a special type of plaster. It is a lime plaster, which acts as an admixture of a large amount of so-called zeolites.

These substances, which are also used for water softening, offer a very high cleaning and Schadstoffbindleistung.

This makes red lime ideal for collecting and binding pollutants released by other building materials (such as floor coverings). It also has all the properties that ordinary lime plaster has.

Red lime is available as complete plaster systems.

Eco-plasters and plasters

Special "eco-plasters" and plasters such as cotton plaster have even more positive effects on the indoor climate and are also environmentally friendly.

Video Board: WATERPROOFING a COB wall ? (earthen plaster) with linseed oil