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working details: The Q Building Buckley Gray

A facade with an external sliding iroko screen

The five-storey building is slotted into a corner site within the existing street pattern; it has a narrow southeast facing frontage to the main road and a 34m-long elevation to the adjacent side road.A retail shell unit occupies the ground floor; upper floors are flats, including top-floor penthouses, set back to create a slatted iroko deck with a balustrade of iroko boards.

The steel frame structure has cast in-situ concrete composite floors and timberstud walls clad with a rainscreen of horizontal iroko boards.The ground floor is framed with precast concrete elements - columns and fascia - to impart a plinth-like solidity in comparison with upper-floor facades, which are of lighter and more delicate materials.

Upper floors to the front and back of the building are either clear-glazed or have storey-height sash windows in iroko frames behind sliding louvre doors.Each has a pair of lower fixed lights and sliding sash upper lights, which are operated in the traditional manner, by suspended weights encased in the jambs.To give privacy, the south-west facade is screened with fixed horizontal aluminium fins, while on more public southeast facade, the screens are formed of louvre doors.

The screens are made of 80 x 12mm iroko timber louvres in an anodised aluminium channel frame, running in standard sliding door tracks at top and bottom.They rest on 80 x 40mm RHS spigots, which are bolted back to the steel edge beams.The spigots project beyond the track to support a 89 x 76mm T-shaped steel frame; it defines storey heights and acts as a frame to a 10mm toughened glass sign, which runs in front of the precast concrete fascia.

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