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A curved cedarclad wall and canopy

WORKING DETAILS: Immanuel College, Thackley Halliday Clark

The sixth-form centre, serving about 250 pupils, is a cylindrical two-storey building - designed as a distinct element in the school campus, to reflect the relative autonomy of its occupants.

It is linked to the street, yet close to the main entrance, so that pupils are free to come and go. The ground floor - a common room - is linked by a curved staircase to an IT room on the first floor.

A horizontal canopy encircles the centre just above the first-floor windows, separated from the wall by a 300mm gap. It is formed of 178 x 102mm universal beams at the edges, welded to a series of similar beams radiating from the walls. The inside edge of the canopy follows the cylindrical shape of the wall; the outside edges are rectangular in plan and supported by CHS columns.

Butt-jointed birch-faced ply panels with staggered joints line the soffit.

Like the main campus, the centre has a steel structural frame. A perimeter ring of 219.1mm diameter CHS columns is set inside the blockwork walls and secured to them with stainless steel channels. The columns support a composite steel/concrete first-floor deck and a roof structure of 152 x 89mm universal beams, which radiate from a central 'umbrella spoke'support. This also acts as a rainwater downpipe for the roof.

Exposed internal columns and beams are coated with intumescent paint.

The blockwork walls are clad with vertical boarding of rough-sawn cedar boards, bolted in an overlapping sequence to timber battens.

The bolts are recessed and holes pegged with projecting cedar dowels.

Cedar boarding is also used to line the reveals of the windows.

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