Mold on the plaster - what can you do?


When mold spreads on the plaster, you should act purposefully and correctly. What is important and what resources are available to you in this article, including what precautions and preventive measures you can take.

Assess the damage picture

First, take a close look at the damage picture, paying attention to the following things:

  • which surface does the mold take?
  • is the mold only in some places (window reveal, corners, floor nearness)?
  • does the plaster feel friable and lumpy?
  • Can you see if the mold has already penetrated under the plaster?

If the plaster is completely penetrated by the mold, it is usually necessary to remove the plaster (this is also the safest variant if the infestation is more extensive).

measures selection

Professional renovation

If the total area of ​​infestation is larger than approximately 0.5 m², you should always seek professional help for the restoration. In this case, it is worthwhile in any case the consultation of an expert to determine the cause, involved mold types and actual extent of infestation in the house safely and professionally. In this way, it is easier to assess the hazard potential and the renovation effort.

Treating the cause

In some cases, mold can be remedied simply by switching off the respective cause. You can read more about this in the section on Cause Research.

Superficial elimination

The superficial elimination, for example, with home remedies alone is usually not sufficient. It must be fixed the cause of the infestation, and if possible be turned off. A superficial elimination is meaningful only if you know the cause, and can pinpoint a specific, temporary event (for example, leaky but now sealed windows).

root cause analysis

The basic cause of mold infestation is always moisture. The moisture in a component can come about in different ways:

  • direct action (water pipe breakage or leaks in the pipe system, defective rain gutter, etc.)
  • indirect influence (generally too high humidity in the room)
  • Insulation defects or thermal bridges (especially with mold in corners or near the floor, but also on larger wall surfaces possible)
  • Condensation (if the dew point is undercut and moisture in the masonry fails)

Always take your time with root cause research and proceed as thoroughly as possible. If in doubt, always consult a designated expert (either a professional mold surveyor or a construction expert). The cause of the existing moisture must be found and rigorously combated - otherwise you will never get rid of the mold.

Tips & Tricks

For mold-prone areas there is so-called anti-mold plaster for renovation. He is not sufficient as a sole measure. Smaller areas can also be painted with lime paint.


Video Board: Mold or mildew in your home