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BRASS, ZINC AND ALUMINIUM
London mixed use redevelopment features metal mix
A combination of solid and perforated brass, zinc and aluminium cladding panels create a striking finish on the redevelopment of 24 King William Street, a new mixed-use office scheme in central London.
The £23m renovation of the 80,730 ft² building, located on the northern approach to London Bridge, was designed by Ben Adams Architects and includes the addition of two new storeys, and Grade A office space. An elegant reception area comprises a
double-height entrance hall leading into a lift lobby, finished with Portland stone floors and feature walls in marble and leather, with brass accents throughout. To reflect the style within, striking perforated Proteus SC TECU Brass panels and bespoke vertical fins and trim flashings, a copper and zinc alloy with a hand applied patinated finish, were specified for the ground level, street facing elevations.
The fins are designed around a rigid bespoke aluminium extrusion that connects to the curtain wall glazing system. The outer brass element of the fins are profiled
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and taper across the length to generate an angled effect – the fins extending further as they ascend - whilst the connection of the material to the extrusion and the window frame remains constant. Their internal aluminium structure
provides the necessary support and structural connection back to the curtain walling. This also created a depth at the rear, hiding the curtain wall system from plain view and giving passers by the perception that the fins float in front of the glazing system.
The combination of thin gauge brass material and internal aluminium support framework ensured that this element of the facade met budgetary requirements. The folding requirements of the fins were “towards the limits of current bending technology,” said Proteus.
Perforated panels were fixed over insulated spandrel panels within the curtain wall system, hiding the ventilation elements of the curtain wall and blending the fins and curtain wall system. The patination effect finish was created by applying a fine orbital grain brush effect to the face of the material before
chemical application and sealing. The panels will gradually weather over time and continue to embellish and enhance the finish.
The rear elevation of the nine-storey building features an equally impressive zinc facade (Proteus HR Graphite Grey Rheinzinc rainscreen panels). It wraps up and over, forming a curved zinc roofing system which blends vertical and horizontal elevations into one. The material is “gaining favour with architects and developers as it provides a long, maintenance-free life and offers adaptability to various design styles ranging from traditional to modern,” said Proteus.
Once dominated by rambling plant
rooms, the interior of the zinc roof is now home to state of the art offices overlooking the City and the River Thames. A limestone facade on the front of the building connects to the roof through perforated flat sheets in a bespoke finish. These are also integrated within the windows on the top two floors, and then flow up and onto the roof generating the patterned effect, “while making it look like the facade and roof are one element”.
ADF OCTOBER 2019
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