Architect and Builder June 2020 | Page 39

floor glazed sliding doors and oversized windows accentuate the views. Glazed balustrades provide an unobstructed connection between inside and outside. The façade plays with colour and relief in the vertical bands which dissect the horizontal axis. The 3.5° inclined 7-storey unitised double glazed curtain wall to the hotel was custom designed to not only allow for accessible internally illuminated spandrel panels, but also to accommodate varying glass curvatures and floor plate depths, while still meeting the structural and fire life safety requirements. Construction Highlights Framing the external envelope of the building, as well as creating visual separation between vertical zones, extensive use is made of off-shutter concrete using the highest possible tolerance – ‘Special Off-Form’ to create an extremely smooth surface finish which required no additional sealant. Shuttering to both vertical and horizontal planes was very carefully considered and designed in conjunction with the formwork fabricator to achieve concrete seams as flush as possible, circular ferrule holes with clean edges, and visually appealing shutter patterns. The two 12.3m high off-shutter columns in the pre-function space were cast continuously using three individually designed oiled steel shutters, while the inclined ellipsoid columns around the hotel bar had custom made shutters to cast these 6.7m columns as a single entity, and then This Spread: Hotel Images One on Whiteley 39