Exterior plaster can only be processed at the right temperature

As durable and durable as a exterior render will protect a building for decades, it is so vulnerable and sensitive to extreme temperatures. The hydraulic binding results from the timely escape of the water by evaporation. If this process is too slow or too fast, the plaster can not develop its optimal properties.

Evaporation determines behavior

The range of processing and drying temperature for exterior plaster is given by manufacturers and craftsmen between five and thirty degrees Celsius. Outside this area should never be plastered and dried.

An external plaster binds by the escape of the contained water, similar to mortar. The speed varies a little due to the chosen cleaning method. A mineral plaster reacts differently than a synthetic resin plaster. For every plaster, if it does not "naturally" dry, it tends to damage.

Summer temperatures

This is influenced by setting at higher temperatures due to the greater thickness of the external plaster. Put simply, thicker plaster has greater possibilities to tie off "economically". The thinner the applied exterior render, the more concentrated the drying period. At temperatures below 15 degrees and from about 25 degrees, the material thickness plays a major role.

When it comes to the question of how many degrees of external plaster can be applied, criteria that have an effect on evaporation must be taken into account. Direct sunlight should be avoided at all temperatures over twenty degrees.

Freeze until set

Even so-called winter plaster does not tolerate frost, both as air temperature and on components. For outdoor plastering in winter, there should be no night frost during the setting phase (up to two weeks).

Tips & Tricks

You can mitigate the effects of temperature by shading and moistening the substrate.

Product Image: Algirdas Gelazius / Shutterstock

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