• 8 April 2013

6 Bevis Marks

6 Bevis Marks is a new 16 storey building at the heart of London’s City cluster. The striking development offers 160,000ft2 of highly specified and flexible Grade A office space with a dramatic ETFE covered roof garden that will enliven the surrounding roofscape.

The new building replaces an outdated seven storey 1980s office that ‘over-sailed the pavement to form a dark colonnade that isolated the building from the street’. Despite being double the floor space of its predecessor, the new development will reconnect the existing neighbourhood. The architectural design sets the building back to align with the adjacent property, 50 St Mary Axe, which will enhance pedestrian routes and create attractive outdoor public spaces.

Waterman are providing multi-disciplinary design services to this prestigious project, working closely with award winning Architects Fletcher Priest and Development Manager CORE, on behalf of Bevis Marks Development Ltd which was a joint venture between AXA/MPGA.

The new building is 80% more energy efficient than the building it replaces. It also re-uses over 50% of the original structural mass, which is part of an extensive sustainability agenda that shortens the construction programme.

Structurally, an extensive suite of sampling and testing was carried out, resulting in the existing under ream piles being re-used. With a new sixteen storey building being erected, a steel frame was adopted to minimise dead loads enabling the existing under ream piles to be re-used following verification sampling and testing. Rigorous analysis has allowed 27% of existing piles to carry more load than previously experienced, up to a 40% load increase. The re-use enables a 1000t carbon saving on pile installation alone.

The mechanical and electrical services design has provided energy efficient heating and cooling systems that minimise maintenance requirements whilst meeting the expectations and demands of a new-build commercial development. Additionally, a fully coordinated design was produced for the basement structure and services using Revit Fabrication 3D drawing package. This complex area of the building required careful consideration of the access and maintenance due to the stacking of services distribution through double height spaces and varying floor levels.

Environmentally, wall-to-wall depths are optimised to achieve excellent daylight penetration. The kiln formed glass façades with its distinctive green tint contrasts with the clear transparency of the high performance solar control windows which surpass current energy saving requirements by 40%. In addition, south facing balconies are cantilevered to protect the interior from solar gain overlooking the new plaza below.

The innovative ETFE floating roof structure will create an all-weather open air roof terrace for the enjoyment of the occupants, who can take the lift to the landscaped space and enjoy the spectacular City views. Over 10,000ft2 of roof gardens aim to give the scheme a unique character.

To deliver the construction phase, Skanska has put together an in-house team, combining its skills and expertise in construction, mechanical & electrical service installations, piling & foundations and utilities. The high quality commercial building, which includes retail areas, basement, basement mezzanine, ground floor and 15 upper floors, is due to be completed in December 2013.

The building has a target to achieve BREEAM ‘Excellent’ by incorporating elements such as combined heat and power generation, rainwater harvesting systems, energy saving lighting systems, condensing boilers, electronically commutated motors on fan coils and energy reclaim systems on AHU plant.

All internal services will be controlled by a comprehensive building management system to increase the overall energy efficiency of the building.

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