Project: New office building, Obere Waldplätze 12, Stuttgart, Germany
Construction firm: FKN Group
Customer product: e-coFACE, with CALOSTAT® Pure as insulating material
Builder: Drees & Sommer
Architect: SCD Architekten Ingenieure GmbH
Project duration: 07/2017 – 12/2021
The characteristics of the facade modules sound like they're straight out of a catalog of specifications for modern planners and architects: innovative, lean, high thermal insulation capacity, modular, recyclable, emission-free, non-combustible. But these – and more – are precisely the features of the facade of the new office building that consulting, planning and project management firm Drees & Sommer is building for itself at its headquarters. While that combination may not yet be a given everywhere, the facade experts at FKN already have a finished product that can be mass-produced and is generally approved by building authorities: e-coFACE.
As FKN knows, “Highly energy-efficient buildings are a key element of Germany's energy transition, and e-coFACE is leading the way in exterior insulation development.” Apart from fire safety and sustainability, the most important issue for builders and investors is the insulation performance of the facade. The use of CALOSTAT® Pure as an insulator in combination with vacuum insulation panels give facades excellent insulation values while remaining very thin.
That won over Thomas Berner, the OWP12 project manager for Drees & Sommer: “The e-coFACE facade gives builders up to 8 % more floor space in projects like these. When they compare the cost of the facade to the extra square footage you gain, investors immediately see the benefit they stand to gain when they sell or rent the property. The economics are extremely favorable.” The module with CALOSTAT® at its core has major potential, especially in metropolitan areas, where land is scarce and expensive.
The overall design and planning of the new office space is remarkable too, however: experts were impressed by cradle-to-cradle concepts for all components, by the efficient design made possible by digital LCM and BIM planning methods, and by the premodularized components and hybrid energy supply system of the positive energy building, which combine geothermal and air-sourced heat pumps with solar panels installed on the roof and integrated into facade elements. Frank Gmach, marketing manager for Thermal Insulation at Evonik, made the following observation when visiting the construction site: “We're proud of the important contribution that CALOSTAT® makes in this one-of-a-kind project, which so forcefully demonstrates many technologies of the future.”
The facade modules are prefabricated, making it easy for site workers to incorporate them into the building.
Franz Ebert of FKN points out the slim design – just 90 mm of the actual facade.
During normal operations, the positive energy building generates more energy than it consumes.
Rendering: SCD Architekten Ingenieure GmbH
Because the insulation is so thin, it left room for easily integrating solar panels into the facade.
Photo: Drees & Sommer