Impregnating masonry - does it make sense?


Again and again, the question arises as to whether masonry should not be better impregnated in order to effectively protect it from moisture. When this makes sense, which types of masonry are impregnated, and which impregnations are used, read this post

Suitable for sealing masonry

Basically brick and clinker masonry is not impregnated. In contrast, sand-lime brick and concrete can be impregnated. Especially lime sandstone has a very high water absorption capacity and is therefore already impregnated from the factory. Since the effect of this protective layer but over time decreases, a later Nachimprägnieren quite useful.

Protective function of the impregnation

Impregnated masonry does not let moisture into the masonry from the outside. In some cases this can help protect the masonry from moisture penetration. However, impregnation clearly does not protect against moisture that in the Masonry is created. This is the case, for example, when the dew point shifts into the masonry. Another cause of moisture penetration inside the wall could be rising damp.

impregnating agent

In practice, different impregnating agents are used, some of which may have different properties and different efficiencies. In general, a wall must be regularly re-impregnated, with most funds this is required at least every two to three years.

water glass

Potassium silicate glass can also be used to waterproof walls from the outside. After applying this already well-known means (it also makes wood incombustible and is suitable as a deep-ground coat and for solidification of loose surfaces) to a Verkieselung in the pores. As a result, moisture can no longer penetrate into the building material.

Water glass is usually sprayed on and worked with a quast thoroughly into the joints. As a rule, it is used in a ratio of 1: 2 diluted (depending on the absorbency of the substrate). The square meter consumption is around 150 - 350 ml.

Tips & Tricks

The impregnation of clinker facades may make sense in some cases, especially if already slight damage (hairline cracks not deeper than 0.2 mm or slight frost damage) are present on the clinker bricks. Also, a significant difference in water absorption capacity between clinker bricks and joints can make sense of a seal. A replacement for the repair of damaged stones or joints is but in no case.


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