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The two-storey building has a cast in-situ concrete frame supporting a timber and steel roof. The main entrance facade, facing east and south, follows a gentle curve and is glazed to give views of a landscaped courtyard.

It is formed of a series of 169 x 69mm Douglas fir posts at 1,200mm centres that rise from a concrete upstand at the base to support the edge of the projecting roof.

Frameless glass panels, inward-opening dark grey-green casements set in white frames, and horizontal Douglas fir boarding are set between the posts, which are faceted to achieve the curve.

The sides of adjoining frameless double-glazed units meet at the front face of each post; they are bedded in silicone and secured with a Douglas fir capping piece.

The jambs of the timber casements are fixed to 50 x 50mm angles screwed to the posts: this avoids thermal bridging and keeps the glazing of the two systems on the same plane. A 50 x 6mm galvanised steel flat, notched into the posts and butting against the back of each casement head and sill, creates a reveal in which the top and bottom edges of the frameless double-glazed units are set.

At the base of the wall the double-glazed units are secured by a 25 x 25mm angle: it is fixed to a projecting steel flat, curved to follow the line of the wall, which, in turn, is bolted to a concrete upstand. The upstand is topped with a continuous bench seat.

An external sunshade reduces solar gain in the entrance foyer: it consists of iroko slats screwed to steel T-shaped sections that are flitched to the posts.

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