The structural frame of the Walbrook is steel, due to the overall height limitations imposed by the St Paul’s view cone (51.36 metres) and the long spans -some of which are in excess of 18 metres. The structural column grid will typically be 9000mm x variable around the perimeter and 9000mm x 12,000mm around the two atria.
The cladding system is externally shaded; A filigree of fibre reinforced polymer horizontal blades which extends from roof level down to the base unifies the building. It increases in density on the upper storeys where the roof is more exposed to sunlight. The shading reduces the amount of cooling required to the office spaces.
The building is rated EXCELLENT under BREEAM.
Renewable systems such as photovoltaic cells, tri generation, rainwater harvesting are utilised.
The building has two atria – elliptical on plan, linking the office levels - between third floor and ninth floor. Each atrium contains bridges connecting through to the glazed passenger lift lobbies.
Foster + Partners Team
Maria Sagrario Moraleda Torres
Client: Minerva plc
Contractor: Skanska Construction Private
Project Manager: GVA Second London Wall
Quantity Surveyor: Davis Langdon LLP
Structural Engineer: Arup
Building Services Engineer: Roger Preston & Partners
Planning Supervisor: PCM Safety
Planning Consultant: DP9
Acoustic Engineer: Sandy Brown Associates
Party Wall and Rights of Light: Delva Patman Associates
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