Exterior plaster with fabric filling develops less tendency to crack

In a Gewebepachtelung a reinforcing fabric is inserted in the outer plaster, which increases the stability and tensile strength of the plaster. The reticulated fabric reduces cracking without being able to completely prevent it. When different materials meet, the specific properties are compensated.

Function and reaction of the plaster

The exterior plaster on the house forms a protective skin on facades and masonry. It is designed for decades of resistance to weather such as rain, cold and heat. All variations and changes in temperature and humidity cause physical reactions.

If the applied exterior plaster has different elongation properties than its base, stress cracks will quickly occur. Depending on the structure and masonry type, the differences in the behavior of the materials may be greater or smaller. Especially in thermal composite systems very different forces impact each other.

Touches and combinations of materials

An exterior plaster as a building skin lies for the most part on masonry. Usual concrete walls make durable connections with common mineral plasters. However, the plaster also covers other materials used in house construction:

  • Window frames made of wood and metal
  • Door frames and frames made of metal
  • Covering panels made of fibrous materials such as on roller shutter boxes
  • Masonry joints
  • Possible apertures via cable ducts and cable ducts
  • Insulating materials such as Styrofoam or Styrodur

In general, the more different the nature of the contacting materials, the more important a supporting tissue filling is.

Partial tissue filling is ideal

In order to guarantee the optimum durability of exterior plaster, the structural implementation must first be given professionally. These include level and solid surfaces without sponginess and incorrect decoupling. When laying the concealed plaster, reinforcements should be applied to all material transitions between masonry and component.

A complete fabric filling on the surface of a façade is only required if very sensitive plaster is used or if it is exposed to exceptionally strong weather conditions. The inlaid fabrics increase the strength of the exterior plaster only slightly. The reinforcement ensures "inner" stability, but does not completely prevent cracking in the finishing coat.

Tips & Tricks

When plastering, make sure that every layer softens outwards. This also applies to reinforced plasters and the modern so-called light plasters, in which this physical condition is often forgotten.

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