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Factory conversion to dwelling Stiff and Trevillion

working details

The dwelling has been created from part of a 1960s industrial shed - a precast concrete portal frame with tapering columns, enclosed with cavity walls of facing brick and block inner leaf. The original pitched roof - strawboard slabs, screed and asphalt roof - was supported on precast concrete purlins. It had been overlaid before conversion with an insulated sinusoidal steel deck, finished with Plastisol. A concrete floor slab divided the shed into two storeys.

Part of the concrete floor slab has been removed and replaced by a three storey insertion composed of bedrooms, bathrooms and a study. To retain the industrial feel of the building, the new upper floors are of cast in-situ concrete and are set back from the original south facade. They are treated as large balconies, each protected by a concrete upstand and a rail of 25 x 25mm solid steel bar. Both sides of the upstand have a shuttered finish produced by formwork of rough-sawn timber boards.

The 450mm wide three-storey high 'slot' between the floors and the south facade acts as a lightwell. At second-floor slab level it is fitted with a horizontal barrier of 8mm laminated glass for privacy. The barrier can be raised with a hydraulic piston to let air circulate in warm weather.

At upper levels the south facade had been glazed with single-glazed steel windows; these were replaced with double-glazed units. On the ground floor parts of the solid walls were replaced with glazed sliding doors.A rooflight, a sealed double-glazed unit with structural silicone joints, has been formed in the roof. New wall surfaces comprise unpainted silver sand and white cement render with polished stainless steel corner beads.

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