Energy-efficient renovation with prefabricated timber frame elements

The natural stone façade of a residential and commercial building from 1972 with 32 units in Munich's city centre had to be removed due to frost damage become.
In the course of the renovation, the façade was insulated to almost passive house standard, provided with new windows and clad with rear-ventilated cladding made of expanded aluminium sheet.
In order to ensure minimal disruption to the ongoing use of the building and the shortest possible construction time, the new building envelope was prefabricated in floor-to-ceiling timber panel construction elements. The design is optimal adapted to the construction process.
The meshes of the expanded sheet metal cladding are arranged upright, creating a textile-looking surface that offers completely different appearances from different sides along the road space. Viewed from the south, the façade's mesh size and the light beige of the anodised aluminium give it a colour and structure that corresponds to the rough plaster of the neighbouring building, which is a listed building. From the north, from Rotkreutzplatz, the building appears dark, the filigree façade becomes transparent.

The new façade is made of approx. 3 by 13.5 metre large, prefabricated timber panel construction elements. The entire six-storey façade could thus be installed in just 6 days, so that the disruption to tenants, especially the shop operators on the ground floor, could be reduced to a minimum. Immediately after the demolition of two window elements, the respective façade element was lifted in and connected with new windows that had already been installed, so that the apartments did not remain without windows for more than an hour. The elements were mortised together with pressed-in beech wood dowels and pinned onto each other like Lego bricks. In order to be able to manufacture the elements with an accuracy of a few millimetres, the existing building was digitally measured. On the basis of this measurement, the workshop plans for the carpentry, window construction, sun protection and façade work were drawn up. The carpentry plant's joinery was then able to produce all the individual parts of the framework of the panel construction elements automatically. The façade elements, including windows, pre-installation for external venetian blinds and façade cladding, were prefabricated in the carpentry shop, so that most of the component connections were carried out under optimal conditions in the workshop.
Since the eight-storey building is assigned to building class 5, special attention was paid to the requirements for fire protection in the planning, which could be taken into account with extremely reduced measures, especially through the careful detailing of the window connections and the special precision in the prefabrication.

*Text: Braun Krötsch Architekten *
Source: Klingelhöfer Krötsch Architekten PartG mbB
Photos: Simone Rosenberg

The preparatory work for this project publication was done as part of the building construction theory in the seminar FACADE 4.0 at the FATUK of the RPTU through a student thesis by Aylin Dikme.

#sanierung # Façade renovation #vorfertigung #holz #holzbau

ARGE Braun Architekten & Klingelhöfer Krötsch Architekten