Necessary steps for basement restoration

Depending on the condition of the basement, cellar renovation can be quite a complex process. You can read about how you plan and work efficiently in order to keep costs as low as possible.

Background information

The first step in a damp or wet basement is always first to clarify the cause of the moisture. This can either be a damage to the pipes laid in the basement, but also from the outside oppressive groundwater or leachate. In some cases, rising soil moisture.

Restructuring measures "in the blue" make no sense. In difficult cases it is also worthwhile to find an independent expert to find the cause. This can later save costly mistakes and unnecessary costs.


In some cases, sealing the cellar from the outside is deficient or defective. You may have to expect a considerable cost here, but without this measure, all other remedial measures will be ineffective.

In other cases, it is sufficient to seal the basic joints, or to perform a floor seal, with a small amount of damage also drying measures and a restoration plaster for the basement walls are sufficient.

Beware of very old buildings

Very old buildings often have cellars made of natural stone masonry. In many cases, there is still a considerable amount of loam between the stones, which makes sealing technically impossible. Even with renovation plasters, care should be taken with care in old houses below the ground level - in many cases, the damage here is often greater than the benefit, quite apart from the waste of money.

Old basements were once designed as food storage rooms, and are therefore deliberately a bit more humid than modern cellars, so that stored food can last as long as possible. Mold growth and moldy odors are usually dealt with here very well by limescale. Lime effectively prevents mildew and moss build-up and keeps moisture out of the wall. Vor To prepare a natural stone wall, the best method is to sandblast with slightly damp sand. Then it is clean and can easily be provided with several layers of lime paint or with an air-lime plaster. If the adhesion is very bad, a very light spray helps to improve the adhesion. From the use of other building materials you should refrain as possible with natural stone walls because of the physical properties.

How to Reconstruct a Basement

1. Careful Damage Analysis

First determine how large the damage is and if the cause may already be apparent. Is it localized water damage, wet or just moisture? Is there already mold or is efflorescence of the plaster visible due to precipitated salts? Carefully remove any damaged plaster with a small mallet to assess the underlying masonry. Ab 2. Sealing measures

If, in your opinion, a seal is necessary, be sure to first discuss the situation with an independent expert who can recommend the most appropriate remedial measure.

If it should be necessary to seal the entire basement from the outside, you may be able to significantly reduce the costs with appropriate in-house services. It is essential to compare the offers of the individual providers very carefully - the price differences are often considerable.

For minor damage without major leaks and low moisture in the basement, you can also simply apply restoration plaster and ensure that the wall is dried by means of drying units and controlled ventilation.

3. Complete renovation

If the drying measures have been successful, you can then provide the basement with a new floor covering and, if necessary, a new wall plaster.

Tips & TricksKalk is a building material that is very well suited to help with drying on damp walls. Especially with old buildings, you can achieve quite a lot with it.

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