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A projecting bay window and balustrade

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working details; Housing at the Canongate, Edinburgh Richard Murphy Architects

The lower floors of the five-storey block of flats are of rendered blockwork and concrete-beam floor construction. The top storey is stiffened with a composite floor of concrete beams with in-situ concrete topping to support a steel frame structure of 100 x 100mm shs columns and 89 x 204mm channel purlins and wallplates which support the timber rafters of three saw-toothed roof pitches. They are covered with second-hand West Highland slates and drain into insulated aluminium valley gutters. The shorter, steeper pitches are fitted with patent-glazed rooflights.

At the north-east corner of the building the upper two floors cantilever out, the ends of the rafters supported by an exposed steel channel. The cantilevered walls are clad with rabetted western red cedar boarding fixed with battens and ply to an insulated timber frame. Each floor is fitted with a double row of Rationel purpose-made timber windows. The upper row, of opening windows, is set beyond the plane of the wall to extend the view. A projecting steel channel formed from 100 x 100mm and 150 x 200mm angles welded together, braces and weatherproofs the window head. The sills rest on a 150mm steel flat which is supported by the balustrade to the lower window. The lower windows are set back and have fixed glazing to comply with Building Regulations. At the north-east corner the glass is butt-jointed with silicone.

The balustrade consists of 150mm steel flats supported by 60mm U-shaped balusters bolted to steel angle brackets. A series of 20mm diameter rods extend from the upper channel to give additional stability.

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