Inside and Out with Nordic Copper

A strong, decorative approach to copper cladding for both internal and external surfaces – combining three different Nordic Copper products from Aurubis – defines the redevelopment of Onslow House, a prominent commercial headquarters building in the heart of Guildford.

Designed by architects AWW, interior design and external alterations sought to add value to letting space and bring the 90,600 ft2 building up to date. The updated, massive, glazed entrance atrium incorporates feature walls – including inset doors – faced with horizontal copper panels, alternating in three different surfaces: Nordic Standard bright ‘mill finish’, Nordic Brown Light and Nordic Brown pre-oxidised copper. The Nordic Brown range offers lighter or darker colour shades determined by the thickness of oxide layer.

Continuity with Diversity

Structural columns are similarly enwrapped with alternating finish copper bands and the copper detailing is even continued into elements of bespoke furniture. The internal copper cladding had a post-lacquer finish applied to arrest further oxidisation, so retaining the three colours and protecting the surface. This creates a reflective surface, mirroring and enhancing the lightness of the atrium space.

The same horizontal copper panel composition of three surfaces continues past the external glazing to the outside. Here, the building’s entrance has been transformed with new copper-clad canopies to create a strong, easily recognised identity, with minimal work to the existing building envelope. Fabrication and installation of the Nordic Copper panels was carried out by specialists CGL Facades.

Surface Development

Externally, the copper has not received a lacquer finish, as AWW explain: ‘We consider copper’s natural surface development outside, reflecting the local environment, to be one of the material’s key attributes. An attractive, gradual weathering and softening of the differentiation between the three Nordic Copper surfaces on the canopies has already begun – and will continue over time – as we anticipated.’

Modern factory-applied surface treatments can provide straightaway oxidisation and patination of copper surfaces to a selected level. Essentially, they bring forward the environmental changes without taking away the integrity of copper as a natural, living material. They form an integral part of the copper and are not coatings or paint, and on-going changes will continue over time depending on the local environment.

In addition to Nordic Standard and Nordic Brown, extensive Nordic Green, Nordic Blue and Nordic Turquoise ranges have been developed with properties and colours based on the same brochantite mineralogy found in natural patinas all over the world.

Nordic Copper alloys include Nordic Brass – which can also be supplied pre-weathered – and Nordic Bronze, an alloy of copper and tin initially with a similar colour to Nordic Standard, which gradually changes to a stable, dark chocolate brown. The innovative Nordic Royal, an alloy of copper with aluminium and zinc, enjoys a rich golden through-colour which remains very stable.

A wide choice of Nordic Decor mechanically applied surface treatments is also available. Aurubis is part of the world’s leading integrated copper group and largest copper recycler.

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