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Carlswerk, Köln Mülheim

The transformation of the Carlswerk copper factory in Cologne-Mülheim from a vacant industrial ruin into a modern office building and event center with a bright, natural light atmosphere is a prime example of a new approach to renovation.

A Prime Example of a New Approach to Renovation

The transformation of the Carlswerk copper works in Cologne-Mülheim from a vacant industrial ruin into a modern office building and event center with a natural light-filled atmosphere is a prime example of a new culture of renovation. The delicate glass roof successfully captures the industrial charm of the historic original while simultaneously meeting all requirements for fire safety, structural integrity, and energy efficiency. 

Project

Kupferwerkhalle Carlswerk

Location

Köln-Mülheim

Client

International Real Estate, HamburgVertreten durch Beos AG

Architect

Carpus+Partner, Aachen

Execution

INDU LIGHT

Products used

INDU LIGHT sets accents

With the revitalization of the copper works hall, architects and developers are following the trend toward a new culture of renovation: “Climate protection and resource scarcity are making the preservation of existing buildings increasingly important. A paradigm shift is underway: instead of new construction, renovating existing buildings is becoming the norm,” writes the Federal Foundation for Building Culture in its Building Culture Report. But there is no rule without an exception: A renovation of this scale is always a special case requiring customised solutions. After all, the culture of renovation means the high-quality, sustainable, and atmospheric enhancement of existing buildings. The goal is to harmonize the building’s exterior appearance, interior spaces, and new functionality. 

Carlswerk Neighborhood

The Carlswerk is a historically significant site. It was here that the first telephone cable connecting Europe and America was manufactured. For several years now, this former industrial site in Cologne-Mülheim, spanning an area of 126,000 square meters, has been transforming into a vibrant urban district dedicated to culture, creativity, and innovation. More than 20 buildings spanning over 100 years of history now house startups, workshops, studios, restaurants, and event spaces. Long-neglected structures are being given new life, including the Copper Works Hall with a
usable area of 7,000 m².

renovation

The stringent requirements for fire safety, building physics, structural engineering, sound insulation, and energy efficiency call for precise planning. To meet these energy efficiency standards, INDU LIGHT is developing a customized daylighting solution using its flexible Glasline system. The 70-meter-long gable roofs, with a total area of 1,200 m² and a 45-degree pitch, are mounted on the hall’s historic steel structure. They replace the 100-year-old skylight made of armoured glass. More than 500 panes are installed in the four continuous rooflights. The hipped gable construction is technically challenging. Due to the limited structural capacity of the historic supporting structure, INDU LIGHT developed a special glazing combination. With double-pane insulated glazing and 25 mm polycarbonate glazing featuring five multiwall sheets, the team succeeded in achieving a relatively low weight per unit area while simultaneously meeting requirements for fire protection, sound insulation, and energy efficiency. This results in U-values of up to 0.8 W/m²K and sound insulation ratings of up to 25 dB. INDU LIGHT also provides systems for natural and mechanical smoke extraction with spindle drives, as well as the control systems for smoke extraction systems. In addition to providing daylight, the roof must fulfill numerous other functions that must be carefully integrated during planning and construction: electrical wiring, as well as supply and exhaust air, are routed into the building via the roof.

The revitalization of this former industrial building focuses not only on technical performance but, above all, on creating a unique atmosphere inside. Beneath the Glasline skylights, a spacious atrium with a high quality of stay is created. White walls, gray floors, glass facades, and exposed ceiling-mounted installations blend harmoniously in the daylight-flooded hall with the rusted steel beams and the new, delicate glass roof structure. The preservation of existing structures and their careful continuation—this successful symbiosis of old and new—makes the building a prime example of what the Building Culture Report calls for: “In a new culture of renovation, buildings are renovated in a way that adds value not only for today’s generation but for many generations to come.”

Impressions

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