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A rainscreen wall of tiles and render

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The new swimming pool has a structure of chs roof trusses supported by 254 x 254mm columns lined with blockwork walls. To resist corrosion produced by the harsh internal environment - a pressurised combination of chlorimins and high humidity - the columns are set behind the blockwork inner leaf, both roof and walls are vented on the cold side of the insulation, and internal wall surfaces are sealed with silicone paint or ceramic tiles.

The external walls consist of full-height rainscreen cladding panels of terracotta tiles, chosen for their qualities of precision manufacture, colour and texture, and white Sto render. They alternate with panels of glass blocks and aluminium curtain-walling. A new fixing system for the terracotta tiles was developed by the manufacturer, Eisenberg, and the installer, Tellings; by fixing the tiles vertically, they can be laid with greater speed than horizontal fixing, and can achieve a construction tolerance of 2mm deviation from the horizontal and vertical plane. The tiles are clipped to a support frame of vertical and horizontal aluminium members, which are fixed to the webs of the structural steel columns, using plastic clips to avoid cold bridges and bi-metallic corrosion. The tile joints align horizontally with the glazing bars of the curtain- wall system and vertically with a series of steel brackets which support the overhang of the projecting roof. They align with the mortar-jointed 190 x 190mm glass blocks at U-shaped expansion joints at 1.8m centres.

The Sto Ventec rainscreen render system consists of a ventilated aluminium sub-frame to which recycled glass boards are fixed. An anti-crack render system applied to the boards gives a jointless finish.

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