Exterior plaster dissolves in larger pieces from the wall

If manual processing errors have been made or if the wrong cleaning method has been selected, external plaster can become detached from the wall in larger pieces. In most cases, minor damage such as cracks precede. Cause is physically seen that the plaster can not behave as he wants. This can also be the fault of the masonry.

Diagnosis and determination of possible causes

An external plaster covers the outer masonry and the facades on entire and large areas. The answers to several questions determine how it behaves:

  • Is it permeable and allows moisture to evaporate?
  • How is the plaster base or the connection to the primer applied?
  • What build thickness and thickness does the exterior plaster have?
  • Is the plaster layer integrated in a thermal composite system?
  • How old and "set" is the building (risers)?
  • Was the exterior plaster processed at suitable temperatures?
  • Do the substrate and plaster type match?

Announcement of detachments

In the rarest cases, external plaster dissolves completely surprisingly from the wall. Putz always forms a kind of "community of fate" with the facade. It must be able to expand and contract under fluctuating outside temperatures, different degrees of humidity and movements of the masonry. If it is not sufficiently decoupled from a background that reacts differently, cracks develop.

Other indicators of fast-deteriorating damage are the crumbling and dragging of moisture. If tears are repaired without removing the causes, this is similar to symptom coverage. The exterior plaster seeks and finds ways to implement its physical "wrongdoing". As a result, it dissolves over a large area of ​​the wall.

Reinforcements and fabric fillings can have a counterproductive effect. The actually stabilizing function can become a "trap" if damaged. Crumbling plaster propagates through the inserted fabric mats to flat crumbling. As a result, the plaster stops in coherent pieces.

Tips & Tricks

Before refurbishing exterior plaster, you can fill cracks and holes with gypsum material and "glue" detached plastered areas. After a few days, check whether cracks renew or the plaster peels off again. In this way, you can identify "faults" that are caused by the construction.

Product Image: Rizhka Nazar / Shutterstock

Video Board: How To Repair Cracks In Plaster On A Brick Wall