Apply the exterior plaster before the interior plaster

In common building planning, the exterior plaster gets its place as an often final trade. When applying screed and interior plaster, a lot of water is transported into the building. It escapes through evaporation again. An external plaster can interfere with interior plaster applied, but it does not have to. Well planned, the other order is possible.

Possible, but not always risk-free

Under construction craftsmen, the right order of the trades is not undisputed. Many representatives of the oral "old school" reject the exterior plaster before interior plaster categorically. You are not wrong to argue with the following factors:

  • Water from screeds and interior plaster must escape through the masonry
  • The later the outer plaster is applied, the lower the tendency for setting cracks exists
  • The masonry including the mortar joints takes a long time to dry out

In the practical execution of a new building, the process and schedule is often confused. In particular, the weather conditions in the fall and in the
Winter affect the processability. Exterior and interior plaster in winter can be reliably processed only from five degrees Celsius minimum temperature during the entire setting phase.

The argument that exterior plastering is preferable because of the risk of frost is inconclusive. Even interior plaster without heating can not be processed. With heating, for example, with construction spotlights also increased evaporation is triggered. A relatively fresh exterior plaster, depending on the masonry, is prevented in his "children's days" also on a "healthy" Abbindeablauf.

At moderate temperatures no problem

In pleasant and moderate weather conditions in spring and early summer, a preference of the exterior plaster for planning reasons is easily possible. If the temperature is twenty degrees plus / minus five degrees, screeds and interior plaster can ventilate and set together with the exterior plaster.

The drying time of the interior plaster and screed is about four to six weeks, depending on the type of wall plaster. If the time difference from the previous application of the external plaster does not exceed four weeks, a ventilated resting phase of the new construction of six to eight weeks is required.

Tips & Tricks

Should your construction project not be able to finish the interior and exterior work at least in parallel due to the beginning of low temperatures, move the exterior plaster to the next spring.

Artikelbild: Radovan1 / Shutterstock

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