Lime color in mold - does it help?

To combat mold, lime paint is often recommended. Whether this actually helps, and on which principles of action this is based, explains this article. In addition, what to look for when choosing the lime paint in any case.

Requirements for mold growth

The main cause of mold growth is moisture. In addition, however, other conditions must be met so that mold can grow and thrive. These are:

  • enough oxygen
  • a medium with a suitable pH (mold requires medium to high pH values)
  • the right temperature range
  • sufficient nutrients that the mold can process (organic material)

If one removes only one of these principles from the mold, he can no longer live and no longer multiply. This is also the basis for the effect of the lime color.

Change of pH by lime color

Lime creates an alkaline environment, due to its chemical properties. This means that if lime gets in contact with moisture or dissolves in liquids, a lye is formed.

Effect on the mold

However, mold needs at least a neutral to slightly acidic environment. Individual molds become even more active in acidic environments. The ph value tolerance depends on the mold type. As with temperature, individual species can tolerate different conditions. Alkaline environments are deadly to all mold fungi.

Removal of moisture by lime paint

Lime has strong moisture-balancing properties. This is especially noticeable when using pure lime plaster in the interior. Lime has the ability to absorb excess moisture from the air, buffer it and then release it back to the room air. Clay plaster also has these properties, but unlike lime, it does not form an alkaline milieu.

Effect on the mold

Lime can store water and moisture, which is then no longer available for the mold fungus. So he is deprived of a second livelihood. If there is no excess humidity there will be no condensation. Thus, the mold can settle nowhere. Of course, this only works in a limited way - too high humidities or large quantities of water can no longer absorb and store lime paint and lime plaster. Sufficient ventilation is of course also required.

Selection of the lime color

When choosing, care should be taken to ensure that it is pure, mineral lime paint with the highest possible proportion of lime. Such colors can occasionally chalk, but that does not matter. You can also paint affected areas with lime paint - you only have to make sure that the place of infection (especially the substrate) is sufficiently dried, and no moisture due to structural defects may arise more.

Tips & Tricks

The use of lime paint is no substitute for professional mold control. Above all, the cause of the moisture must be found and completely removed from the construction process. Likewise, thermal bridges must be remedied. Lime paint can only be an additional or preventive measure for mold control.

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