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Working details

The single-storey building has a metal roof on curved glulam beams supported by a series of tree-like structures, each a set of four tubular steel struts branching from a circular column. It encloses a 25 x 13m six-lane swiming pool, with changing rooms on one side and a viewing gallery along the other, set 1.5m above the level of the pool to accommodate the natural slope of the site.

A band of mature trees and woodland lying to the south-east of the pool building gives natural shade to a large glazed aluminium curtain-wall with Low-E glass. On other walls a band of clerestory glazing runs just below the eaves. The delicate column and strut 'tree' structures link the pool to the surrounding landscape. The position of the struts allows the beam load to be more evenly distributed. Uplighters are mounted on the column heads.

The Plannja roof system rests on 450 x 160mm curved glulam beams, 26m long. The profiled internal deck spans 4.5m between the beams and acts as a stressed skin, eliminating the need for roof bracing except at the ends. The deck is perforated and lined inside with 30mm mineral fibre acoustic insulation to give good sound absorption, with a foil-cored vapour check membrane above to prevent interstitial condensation. The aluminium roof covering was laid on a breather membrane and mineral fibre insulation. The roof extends beyond the glazed wall, supported on the ends of the glulam beams which taper to the gutter; the exposed end grain is capped by an aluminium plate. At the eaves a glulam filler beam runs between the curved beams.

The pool is a stainless-steel panel system, chosen to take the pool construction off the critical path. The panels, supported by steel A-frames, and the concrete floor slab are lined with a pvc membrane with welded joints.

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