Efflorescence on clinker - what cause do you have?

Especially on clinker facades occur again efflorescence. What causes these efflorescence, how dangerous they are, and what you can do to eliminate them, read this post.

root cause

Particularly in the case of newly erected clinker facades, efflorescence very often occurs in the first two years. Clinkers have a certain capillary effect, which allows the transport of salts to the surface of the facade. This works in a similar way to the appearance of efflorescence on the plaster.

However, clinker bricks do not themselves contain any harmful salts that could be transported to the surface. In almost all cases, these are easily water-soluble salts from the mortar, which are only transported through the capillaries of the clinker bricks. After evaporation of the moisture, the salts deposit as a white, crystalline layer on the clinker surface.

Other possible causes

  • Bricks have not been stored on the ground (this allows them to absorb salt moisture from the ground)
  • Stones have earth contact (especially in the base area with no existing gravel barrier, which prevents earth contact)
  • Paving clinker (efflorescence not always avoidable, most common cause road salt)


The occurrence of such efflorescence is in most cases only due to excessive moisture penetration of the masonry in the construction phase. If unfinished masonry is always carefully covered during construction and protected from rain, this efflorescence usually remains.


As after some time (usually one to two years) sets a so-called equilibrium moisture content, and the efflorescence is washed away by the weather, the damage usually gives itself - except for paving stones and pavers, where the efflorescence often occur again can.

Tips & Tricks

Whether - and in which cases - the efflorescence on the clinker is a real defect in the execution, read in this article.

Video Board: How to Clean Efflorescence Off Stone -- by Home Repair Tutor