Client: Luxury Hotel Kameha Grand Bonn
Type of works: supplied Reynobond® aluminium composite panels
The Life & Style Hotel Kameha Grand Bonn has already been bestowed with two architecture awards; the International Property Award and the MIPIM Award. The members of the jury were impressed by Karl-Heinz Schommers architectural design, which is true to a number of different aspects: the sensitive incorporation of the surroundings, the use of innovative technology, the high level of user comfort and sustainable, climate-efficient use of the building.
One basic idea behind the urban planning was to develop a group of buildings on land which once was home to a cement works of old and new constructions, thus creating an exciting dialogue between the existing listed buildings and modern architecture. This challenge was to unite this challenge with the building owners vision of creating a hotel of the 21st century to simultaneously accommodate a conference, leisure, spa and lifestyle hotel, along with an events facility. The result is a five-star hotel, which has become a top-rate destination also for architecture and design tourists.
From afar the building attracts attention with the silver shimmer of its aluminium and glass facade. The function such a design fulfils quickly becomes apparent. The entire building, with its dynamic curving design, devotes itself to the surrounding landscape of the Rhine and Siebengebirge mountains. From the sixth to third floors, the building plummets towards the Rhine. In doing so, spacious roof terraces could be integrated into each of these floors as well as an outdoor pool on the third level, which also affords a view onto the Rhine.
On account of the trapezoidal tapering of the hotels struts, the 104 m long outer sides stand at an angle to the river, enabling hotel guests on either side to enjoy the special riverside location. There is a continuation of this direct reference to the Rhine within the building. On entering from the street, guests have a view of the open-air terrace and riverbank through the 7 m high lobby, atrium and the events hall, which from above is completely glazed and unsupported, and measures 12 to 21 m in height with a floor space of 1,800 m2.
Despite the size and solidity of the hotel, with its 254 guest rooms, seven bars and restaurants, seven conference and banqueting rooms, as well as spa and fitness area, architect Karl-Heinz Schommer was able to design a building which appears elegant and dynamic and fits in perfectly with its surroundings. The airiness of the building is on the one hand the result of its aspiring, arcuate form. Its solidity, on the other hand, is played down by the combination of transparent glass and light roof cladding in the form of Reynobond® aluminium composite panels. This winning formula is the outcome of sophisticated collaboration between architects, engineers and craftsmen.
The first task was to ensure the technical and physical safety of the roof and facade with its multitude of recesses, edges and connecting lines from the north to south plinths. In addition to numerous complex details, those responsible developed a metal roof construction whereby the metal roof, with a total surface of 4,860 m2, was constructed over a standing rebate system on a reinforced concrete floor. The outer membrane is constructed from Reynobond® aluminium cassettes, each measuring up to 6.73 m x 1.60 m.
The benefits of such cladding were appealing to Karl-Heinz Schommer, both in terms of the shimmering silver appearance and the ease with which it can be manipulated. The many curves and arcs of the building and the possibility to prefabricate large panels for assembly on-site were a reason for choosing Reynobond®, in addition to the material properties and designs. The special properties of the material of particular importance to him were durability, low level of maintenance, self-cleaning and contribution towards sustainability of the building.
Construction of the facade is just one element in the entire energy concept. The hollow sections of the facade are fed with water from a geothermal unit, allowing them to serve as intelligent heating and cooling panels. The geothermal unit, with its aquifer storage system, heats and cools the hotel, with a distinction being made between summer and winter operations in order to optimise the energy yield.
The climate-controlled floor beneath the glazed atrium functions in a similar way to the facade. Along with concrete core activation in the roof systems, a pleasant climate is created all year round. The entire package of geothermal unit, building architecture, central building control system along with individual room control, effects savings annually of approx. 1,700 MWh primary energy and 400 t carbon dioxide.
The functional energy concept, sober facade construction and fine steel construction of the glass atrium are off-set by the attention to detail, opulence and warm tones of the interior design which was created by globally renowned designer Marcel Wanders. Here again, transparency and large dimensions play an important role whether from the 3.10 m ceilings and full-length windows in the rooms and suites, or the possibility of joining the rooms together. Each room is an experience in itself. Some are dedicated to special themes, ranging from a Diva suite to Beethoven suite complete with electric piano, as far as a Fair-Play suite with putting green and pinball machine.
From the outset, Karl-Heinz Schommer found the design, when interplayed with the buildings architecture, to be both exciting and soothing. The eye of the beholder needs excitement in order to come to terms with the added use of design. The combination of Marcel Wanders design and the elegant architecture will certainly remain ingrained on guests memories, encouraging them to return again and again.