Painting aerated concrete - how does that work and what do I have to pay attention to?

Aerated concrete is a material that can not easily be painted. How it still works, and what you should pay attention to, and what preparatory work is absolutely necessary, is therefore explained in detail in this article.

Plastering before painting

If, for example, shelves or a bar made of aerated concrete have been built, then it should often be painted. As a rule, however, aerated concrete can not be painted without previous plastering.

Fill out as an alternative

Spackling can be an alternative to make aerated concrete spreadable. So that the putty keeps well, and does not cure too quickly, it is recommended to pre-coat the cellular concrete wall with Tiefengrund twice.

Painting aerated concrete - how does that work and what do I have to pay attention to?: work

Gypsum plaster as an alternative

Applying a thin gypsum plaster is the safest way to actually keep paint on the cellular concrete wall. The gypsum plaster that is used must be suitable for very absorbent substrates. Aerated concrete absorbs a lot of water very quickly.

In some cases, the pre-painting a so-called Aufbrennsperre may be necessary. This is especially necessary for plasters that are not designed especially for very absorbent substrates.

The anti-burn barrier prevents the aerated concrete from draining the plaster too quickly. In this case, the plaster does not last and becomes friable. The burn-on barrier can be easily pre-painted with a quast.

The plaster used may only be applied in very small layer thicknesses. Recommended are all light plasters, preferably gypsum based. Lime-cement plasters are by no means suitable for cellular concrete.

Suitable colors

On aerated concrete - whether it is filled out and sanded or thinly plastered - only mineral paints should always be used. Their properties harmonize best with the properties of aerated concrete.

If walls are erected outdoors - for example, as a separation wall for the garden - a minimum of two times with a suitable weatherproof paint is imperative. It prevents the aerated concrete from becoming saturated with water.


After filling, sanding the wall makes sense. When plastering, on the other hand, sanding does not necessarily have to be done. If a particularly smooth appearance is desired, and the plaster has minor flaws, but it can be carefully again very carefully sanded.

Tips & Tricks

An alternative to painting may also be direct bonding of the flat wall to ceramic tiles. There are special adhesives that adhere to aerated concrete.

Video Board: BRICK STAMP