Exterior render dries moisture and changes appearance and texture

The common to external plaster, which draws moisture, is often difficult or even impossible to explain cause. Especially near the bottom of pedestals come several structural defects into consideration. In addition to a complex renovation and renovation on and in the masonry can be created temporarily with a sacrificial plaster remedy.

Possible causes

The external plaster on the facade is a kind of building skin, which protects the masonry and more or less completes. The plaster usually reaches from the ground-level base to the roof. In general, of course, a weather-resistant plaster must be chosen, which can withstand the soaking of rain and frost.

When it gets wet and stays wet, cracks appear in the masonry and the plaster crumbles and does not hold, the following causes are common:

  • Injection and backwater acts on the plaster from the outside
  • The plaster diffuses too little
  • The masonry and the substrate behind the plaster is wet
  • Water runs from the top behind the plaster into the masonry (roof defect)
  • Rising water is distributed in the masonry
  • The perimeter insulation of the building has shortcomings

Repairs and renovations

Moisture-pulling plaster, if properly processed, always points to structural defects in the building. Therefore, repairing cracks and sealing by stroking is always just masking and masking of symptoms.

The water in a damp masonry always seeks the path of least resistance. This is in many cases the plaster. If it is "forcibly" sealed, the moisture will go to other pains that will greatly increase damage patterns. The renovation of an external plaster always means a removal.

Sacrifice plaster can help with no ultimate solution

The building and its plaster must always be considered in the physical and thermal context. Changes in the interior such as a barrier plaster in the basement can add to the exterior plaster. Depending on the structure of the masonry, the inward-penetrating moisture will now burden the exterior plaster.

In case of impossible identification and localization of the cause, why external plaster draws moisture, a partial sacrificial plaster can be the solution. Especially in the base area of ​​a building, it absorbs a lot of moisture due to its composition. Good sacrificial plasters need to be renewed only about every five years.

Tips & Tricks

Many providers use the method "out of sight, out of mind". Do not get involved in "wet" compromises, except for sacrificial plaster variants. The plaster is your first indicator when it comes to the preservation of the fabric.

Product Image: maskalin / Shutterstock

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