Masonry: which thickness is usual?


Especially for laymen, the strength of masonry is often confusing. What is the strength of load-bearing walls, which thickness have partitions? Why is an exterior wall of aerated concrete often so massive? Is there standard dimensions for the wall thickness? Answers to all these questions can be found in our post.

Standard strengths of masonry

For the strength of masonry, there are certain standard values. You have to differentiate between

  • Separating and partitions (not supporting)
  • wearing walls and
  • outer walls

For the outer walls, the distinction between single-shell and double-shell masonry is still important. A facing brick made of clinker bricks (clinker facade), for example, represents a two-shell masonry. An exterior wall of plastered aerated concrete or bricks, however, is a single-shell masonry. The total thickness of a double-shell masonry is of course greater - for the individual pieces of masonry, however, this is not true.

Separating and partitions (not supporting)

In many cases, such walls are executed today in dry construction. This is cheaper and meets the requirements in most cases.

For reasons of cost, masonry partition walls are very often used today for sand-lime brick walls, often even when the outer wall consists of clay brickwork. The wall thickness of internal walls is often 11.5 cm by default, but can sometimes be 5.2 cm or 7.1 cm.

Wearing walls

Load-bearing walls are statically more resilient than simple partitions without supporting function. For this reason, they are also more powerful. The standard wall thickness is 17.5 cm here, but it can also be 24 cm.

outer walls

For exterior walls there are different dimensions - common are here:

  • 24 cm
  • 30 cm
  • 36.5 cm
  • 42.5 cm
  • 49 cm

Factors for the wall thickness

Depending on the wall thickness is always on the load that has to withstand a wall. Basically, the higher the load, the stronger the wall. Therefore, load-bearing walls are often recognized by their greater strength (but this is not always completely reliable).

In the outer walls also heat protection effects come as a criterion for the wall thickness. For example, extra-strong aerated concrete walls can already be enough today - additional insulation on the outside of the wall is no longer required to reach the minimum values. This saves effort and costs of a separate insulation.

Tips & Tricks

The strength you need to build masonry depends mainly on static factors. The calculation rules for the required wall thickness apply, you can also get in touch with a professional bricklayer. The calculation of a necessary wall thickness is one of his tasks.


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