Wall - which mixture should be used?

The grouting of exposed masonry is basically not that difficult - but it has to be done carefully, and above all, the use of the right grout is important. Which mixing ratios are suitable for grouting masonry, read in this article.

Purpose of grouting

The grouting has not only an optical value, but also a technical value. Cleanly grouted masonry is better protected against aging and damage than badly grouted.

If the bricklayer does not apply a smoothing mortar anyway (the existing mortar joints in the joint or butt joint are simply smoothly smoothed), then the exposed masonry must be finished with a suitable joint mortar
be grouted.

Grouting at the natural stone masonry

This also applies to natural stone masonry. However, there are always special requirements for the grout. For example, when grouting a sandstone wall, you should never use cementitious grout.

In addition, the joint net also has the function to absorb the expansion of the stones, which in turn makes mortars with special properties (natural stone mortar) necessary. Trass lime mortar is quite suitable for natural stones in the outdoor area.

Joint mortar for exposed masonry

When joint mortar very special properties are required. This makes a correspondingly designed mixing ratio when grout necessary. The mortar must not be too hard, and it must not be too dense.

The problem with too hard mortars (often seen in clinker facades) is that it can come to blooming and the joint bursts. As a result, the stones take permanent damage.

Cement-free mortars are a good solution outdoors, even with exposed masonry. As a rule, quicklime mortar is a very good solution. Of course, you can also use ready-made grout from the hardware store, as a rule, these products are mixed appropriately.

Mix joint mortar yourself

When mixing yourself, there are two proven recipes:

  • Lime and sand in the ratio 1: 3 to 1: 4 (1 part lime, 3-4 parts sand), the classic self-made air lime mortar
  • with a slight amount of cement it looks different: lime: sand: cement = 3: 12: 1

Aerated lime mortar with aggregates that keep it moist for longer is often easier to process. That applies to most precast mortars.

Tips & Tricks

Air-lime mortar with a small proportion of cement are unproblematic. A minimal cement content makes the mortar a bit more durable over time. However, this proportion should not be too high, otherwise the mortar will be too hard. Always use grout mortar when dry.

Video Board: What's the Best Mix for Perfect Rendering?