The Protestant Jesus Christ Church in Berlin-Dahlem, built in 1930/31 by architect Jürgen Bachmann and consecrated in December 1932, has been undergoing extensive renovation since 2021. During the Second World War, the building suffered considerable damage, especially to the windows and roof, which led to long-term moisture damage.
In the post-war period, extensive renovation and conversion measures were carried out, including the separation of the front part of the church into a so-called winter church in order to be able to hold mass during the construction work and in the cold seasons.
Since then, however, only selective renovations have been carried out, so that a fundamental restoration was now necessary. We took on the work phases 1-7 and focused on the renovation of the slate roof.

Photo © Andreas Tschersich.

We were responsible for renovating the slate roof, which had various damaged areas. The aim was to preserve the excellent room acoustics while at the same time taking into account the requirements of monument preservation and building physics.

Further renovation measures include the repair of the clinker brick façade and the tower, whose cracks and washed-out joints need to be repaired, as well as the repair of the badly damaged double-glazed windows. In addition, the coverings of several flat roofs need to be renewed, corroded steel girders derusted and damaged façade elements replaced. Inside, the heating system needs to be replaced and the former winter church, a separate vestibule, is to be redesigned to meet the liturgical requirements and the needs of the congregation.

In addition to planning and implementing the construction measures, we also oversaw the preparation and submission of funding applications for financial support for the project.

Exceptional acoustics

The Jesus-Christus-Kirche is known for its exceptional acoustics, which have made it internationally famous under the nickname "Karajan's Cathedral". In the 1960s and 70s, Herbert von Karajan conducted numerous concerts here and realized several recording projects in collaboration with the RIAS recording studio, which was located in the church. This recording studio is now used by Deutschlandfunk.

We worked closely with the Technical University of Berlin and various acousticians to ensure that the acoustics of the church were not impaired during the roof renovation. A 1:1 scale model of the roof (12 m²) was tested in the TU Berlin's reverberation room to compare the acoustic properties of the planned roof structure with those of the existing structure and to ensure that the historic acoustics of the church were preserved.

Drone image © Thomas Rosenthal.
Drone image © Thomas Rosenthal.
Drone image © Thomas Rosenthal.
Drone image © Thomas Rosenthal.