maxit renovates historic Sonnenstein Castle on the River Elbe

Situated on a picturesque rocky plateau about 70 metres above the Elbe near Pirna, Sonnenstein Castle is a listed castle fortress with extensive grounds. From 2009 to 2011, Sonnenstein Castle was extensively renovated at a cost of around 45 million euros.

A comprehensive renovation of the exterior façade and interiors of Sonnenstein Castle was unavoidable in order to preserve the complex permanently. The façades are strongly characterised by stucco, antique plaster and basement plaster, which had to be taken into account in the structural implementation. It was above all the historic basement plaster that posed particularly high demands. Overall, the procedure required careful planning in order to develop a realistic schedule for the renovation of this large complex within which all the work could be carried out.

Technical know-how in silo logistics as well as in thermal insulation and crack repair on the façade convinced the contractors to use maxit Group products. In the interior of the facility, the walls were renovated with the 380 plaster finish using purcalc 300 lime smoothing compound.

With the help of a loop scraper, the possum grooves in the outer façade were worked out and drawn with a special fibre mortar. The subsequent work was carried out with maxit multi 270 S. At a later stage, the entire exterior façade was finished with coloured felt plaster and painted with a weather-resistant silicate paint when dry.

To ensure that the basement plaster was suitable for the building, maxit took a plaster sample and analysed it in its own laboratory in Krölpa. After consultation with the responsible employees of the monument protection department, they decided on a coarsely coloured basement render with quartz sand.


Fuchs & Girke Bau und Denkmalpflege GmbH
Bergener Ring
01458 Ottendorf-Okrilla


  • maxit purcalc 380
  • maxit purcalc 300
  • maxit therm 75
  • maxit multi 270 S

Project location