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14, Cornhill
The refurbishment and extension of 14,Cornhill posed a number of difficult interfaces to resolve. With a total of 23 different elements forming the works package, including curtain walling, windows, doors, fire rated glazing, structural glazing, roof glazing and balustrading, this was a project with just about every product in OAG's portfolio.
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The finished result of this sloped façade, looks simple enough. The design is far from simple however. Each floor slab is suspended from the floor above in a giant cantilevered construction, not too dissimilar to a giant umbrella. This construction means each floor has a different movement pattern when related to the adjacent floors.
Combined with restricted loading capacities, OAG's design team constructed a solution which effectively built a separate façade for each level, with a movement joint at each floor level. The facade is sloped at 18 degrees off vertical, which required additional novel drainage and ventilation considerations.
The project held a number of challenges for OAG in meeting the design and programme requirements. The mix of refurbishment and new build as part of the building Envelope and Fit Out works added to the complexity of the scheme in the planning, management and on site logistics.
OAG's package works contained eighteen Assemblies, each different in scope ranging from External Glazed Façades, Fixed Point Glass Enclosures, Atrium Roof and Linings, Balustrades to Fire Screens and Doorsets, each with an added responsibility to develop and co-ordinate the design interfaces with other works.
The most challenging Assembly being the Inclined Glazed Façade to the rear of the new building; 490 square metres of bespoked glazed curtain walling spanning six levels, independently supported off each level. The restricted working areas and access presented OAG with specific logistical problems requiring multi discipline labour force working off the slab edges and external rope access to complete the installation, in at times very difficult conditions.
The varied aspects of the works, the innovative design concepts and goals where successfully fulfilled by the Project Team in providing a high standard and quality installation.
OAG is a trading division of Optima Contracting Limited, A company registered in England. Company No. 1886477