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Working details A BAY WINDOW AND BALCONY

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BUILDING STUDY; BROOK HOUSE, PARK LANE

Brook House is a new eight-storey building in London's Park Lane, London. On the ground and first floors are shops and offices; the four higher floors contain flats; the top floors are each to be individual penthouses.

The building's cast in situ concrete-framed structure is clad, on the west-facing Park Lane facade, with hand-made brick; its two side facades with Portland stone. The four floors containing the flats have bay windows which open out on to balconies, set one below the other. The offices on the first floor open out on to continuous glazed balconies.

The Portland stone slabs are set in a series of storey-height stainless- steel frames, which divide the facade into bays. The 75mm-thick slabs were dowelled and cramped together and laid in the frames, formed of 100 x 100mm stainless-steel angles. Each frame was then fixed back to the concrete slab with brackets. Rainwater pipes, concealed by stainless-steel cover plates, are set in the recesses between the edges of the steel frames and the sides of the bay windows.

Each bay window is supported on a cantilevered concrete floor slab and framed by a pair of 300mm-diameter circular stainless steel columns. The fascia of the bay floor is formed by a 300 x 100 x 6mm stainless steel channel with welded flanges along its web. A 100 x 100mm stainless steel channel above it supports the floor finish - 75mm Hillend Whitstone granite pavers.

The soffit of each bay is lined with 3mm insulated stainless steel sheet which is fixed to the back of the fascia channel. The balustrade comprises a frame of 50 x 6mm stainless-steel flats inset with 10mm-diameter bars. It supports a tapered handrail of cast bronze with an 'antique' finish.

The bay window is a composite oak and bronze frame fitted with double- glazed units, with an insulated bronze panel above it.

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