Use wall anchors retrospectively - is that possible?

The anchoring of subsequently created walls on the existing masonry always causes problems. If no wall anchors were used, there is always the question of whether this can be done later. An answer can be found here.

Ways to anchor walls

If a newly created wall encounters existing masonry, the main problem is that it can not be interlocked with existing masonry. However, this is provided for in DIN 1053.

It must be made a tensile and pressure-resistant connection between the two walls - and this is usually only by gearing. An alternative, however, are the butt joint and wall anchors used.


If at the two abutting walls the butt joint is mortared sufficiently thick (usually between 6 and 15 mm), the compressive strength is already given. For the tensile strength wall anchors can be inserted. This would fulfill the requirements of DIN:

  • non-positive connection between both masonries
  • pressure-resistant connection
  • tensile bond

If no wall anchors were used from the outset, you can also screw an anchor strip to the wall, in which wall anchors are then simply hung. There are different products for this.

As a rule, such strips are usually galvanized and intended for screwing. Another possibility might also be so-called Halfer rails. They can be embedded in concrete and also produce a stable connection between two masonry parts after installation.

Subsequent manufacture of a bandage

Theoretically, it is also possible to remove the corresponding stones in the existing wall, and to subsequently produce a dressing. However, this can be associated with some problems in the execution, especially when stones are to be taken out of an already supporting wall again.

If in doubt, you should prefer to use a specialized company in such projects, which can offer appropriate solutions and possibly even takes over the execution, so that it is actually carried out properly.

Tips & Tricks

Always remember the statics for everything you do with masonry. This is not only true for the walls but even for slitting walls!

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