Bitumen painting - a guide

Making a bituminous coat is not difficult. With the right guidance and the right tools you can do it yourself. What are the prerequisites and how do you have to build the coat layer by layer?

Bitumen paints

Bitumen paints protect components against moisture. They have a shut-off and insulating effect.

In principle, paints are structured as follows:

  • possibly sealing slurries as pre-treatment
  • primer coat
  • top coat with bitumen insulating coating
  • two further top coats with the bitumen insulating coating

With such a coating structure, moisture coming from the outside can be adequately blocked from one component side. In most cases, such a painting is sufficient for the outside of the basement wall, if only soil moisture is present.

Thick coating and barrier webs

However, if there is more moisture, a thick bitumen coating must be applied. These elastic coatings, which are also resistant to de-icing salt and moving wall parts, hold much more water than a single coat.

Whatever is appropriate in your case, you should discuss it with a specialist. As a rule, however, if more than just soil moisture is present, it might be better to use a thick coating. If water flowing directly over the wall is to be expected, additional protection must be provided. These may be, for example, so-called barrier webs (these are webs of polymer bitumen), which is glued over the bitumen thick coating. Alternatively, you can also use special plastic films for this purpose. Sealing slurry

Sealing slurry is a good way of further sealing the masonry below the bituminous layer. Sealing slurries are suitable for


on cement plaster

  • on full-walled masonry
  • Sealing slurries usually consist of cements, various minerals and some other additives that make them particularly easy to process. In addition, the material is plastic-coated. It is inexpensive to get in powder form.
  • The masonry must be intact before application, any holes and cracks and friable joints must be filled. If a wall is particularly absorbent, it should be moistened beforehand.

Sealing slurries are applied in several layers (usually 2 - 3) with a puff. The layers should be as thin and even as possible. This is important so that the layer then really seals properly.

Tips & TricksWith a combination of sealing slurries and bituminous paint you can seal very effectively and provide a high level of protection against the ingress of moisture. With pressing water on the basement walls, you absolutely have to do more. Leave the seal in such cases best to the professional.

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