For over a year now, all new buildings in the EU have to meet the "lowest energy building" standard and should cover their energy needs with renewable energies wherever possible. But energy efficiency is only one side of the coin when it comes to sustainable building. On the other side, the discussion about grey energy as well as the circular use of the raw materials and materials used is gaining more and more momentum. And it is not only the policy sphere that is giving sustainable construction a push. In fact, the first major tenant of the Økern Portal office complex had explicitly insisted on BREEAM Excellence certification.
Facade made of recycled aluminium
Økern Portal is one of the largest development projects ever realized in Norway. But it is also outstanding because of its striking 14,600 m2 facade made of recycled aluminium. Aluminium producer Hydro's CIRCAL 75R alloy, made from at least 75 % end-of-life aluminium, has a carbon footprint that is second to none: the guaranteed carbon footprint under 2.3 kg of CO2 per 1 kg of aluminium is 84 % lower than the average for primary extraction and is equivalent to the CO2 released when wood is burned. With WICTEC EL evo from Wicona as the main facade and the Sapa 4150 facade system for the lower two floors, two brands from the Norwegian aluminium specialists are installed in the showcase building.
[Almost touching the sky at Chadstone shopping centre]
The client and owner is Oslo Pensjonsforsikring. The complex offers 80,000 m2 of space for offices, a hotel, common areas and a food court. Urban gardening, beehives and a running track are planned on the green roofs. Despite the size, the DARK Arkitekter office has managed to breathe lightness into the design. The building stands on stilts to allow for fluid transitions between the public park and the commercial spaces. The aesthetics of the facade, installed by Staticus, establish a connection with the surrounding nature through the arrangement of its 1,588 trapezoidal aluminium elements. Vertically running bands are reminiscent of tree trunks, while the faceting of the horizontal "leaf elements" creates plays of light and shadow and emphasizes the liveliness of the building envelope. The sophisticated system of solar shading, opaque surfaces and double glazing ensures that the facade meets all regulations and energy efficiency requirements.
Insulating glass on demand on the first two floors
The first two floors, executed by H-fasader with a Sapa standard facade profile, face in six different directions. Glaseksperten A/S from Hjørring, Denmark, therefore customized the total of 3,000 m2 of triple glazing to meet the different requirements in terms of sound insulation, thermal insulation, safety and space utilization. Among other things, insulating glass with varying sound insulation values between 32 and 39 dB was installed. In addition, invisible sound insulation for walls and ceilings ensures that the retail and commercial areas can be used for a wide range of purposes.
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