Allen & Overy LLP HQ, Bishops Square
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One Bishops Square, 2008; Photo Courtesy of the World Green Roof CongressProject Name: Allen & Overy LLP HQ, Bishops Square
Year: 2005
Owner: Allen & Overy
Location: London, England, UK
Building Type: Multi-Use
Type: Extensive & Intensive
System: Single Source Provider
Size: 58125 sq.ft.
Slope: 1%
Access: Accessible, Private
Submitted by: Alumasc Exterior Building Products/Greenroofs.com

Designers/Manufacturers of Record:
Project Architect: Foster & Partners
Landscape Architect/Sub Consultant: Townshend Landscape Architects
Contractor: Willerby Landscapes
Greenroof System: ZinCo
Waterproofing: Hydrotech Structural Waterproofing
Developer: Hammerson Plc, Corporation of London
Planning Authority: Tower Hamlets
Greenroof Supplier: Alumasc Exterior Building Products
Photo Courtesy AlumascPhoto Courtesy AlumascPhoto Courtesy Alumasc
The growing movement towards a more ecologically responsible London was given added impetus recently when a new development in the City?s historic Spitalfields district incorporated Alumasc ZinCo green roof components as part of its key specifications. Located in the historically sensitive area of Spitalfields, the Allen & Overy LLP HQ in Bishops Square completes the regeneration programme of this important neighbourhood bridging the City and the East End.

The new headquarters for Allen and Overy steps back from Bishops Square in a series of green tiers, with roof gardens overlooking the plaza below. The building was commissioned by Allen & Overy to meet the needs of a modern international law firm with strong environmental objectives in mind, serving both retail and office use.

Spitalfields is an historically sensitive area in the East End, once home to one of the largest wholesale fruit, vegetable and flower markets in Europe, originally established in the 13th century. The wholesale market has since relocated, and the new buildings in Bishop?s Square, comprising a mix of offices, houses, shops and cafes, stand on the site of a demolished modern annexe. It seems entirely appropriate that the site of London?s traditional flower market should be enhanced by the inclusion of green roof plantings as part of the area?s ongoing redevelopment.
Photo Courtesy AlumascThe expanding London skyline in the reflection; Photo by Linda S. Velazquez, September, 2008
Completed in May, 2005, the area encompasses three landscaped greenroof terraces, and a fourth terrace is covered with photovoltaic cells to capture the power of the sun and reduce the energy take of the building. These open green spaces on private terraces provide an area where staff can relax and also help to reduce urban heating.

Alumasc?s FD 40 Floradrain? water storage and drainage board was specified to be laid under the substrate. FD 40 is manufactured from recycled polyethylene, and enables substrate aeration as well as allowing stored water to evaporate, with any excess draining away through multidirectional channels on the underside. Hard landscaping elements may also be constructed directly on the board.

A variety of Alumasc?s specialist substrates is available to suit specific plantings, including sedum, cranberry bog, rock garden, heather and lavender. The company is the acknowledged UK market leader in living roofs, a specialist manufacturer of complete systems backed by a technical support service that is second to none. The ZinCo system has been specified for an enormous number of major projects throughout the country, offering as it does ecologically beneficial, aesthetically pleasing and environmentally sound green roof solutions.

Additional thumbnail photos:

One Bishop's Square for the World Green Roof Congress; Photo by Linda S. Velazquez, September, 2008Photo Courtesy AlumascOne Bishop's Square for the World Green Roof Congress; Photo by Linda S. Velazquez, September, 2008Photo Courtesy AlumascOne Bishop's Square for the World Green Roof Congress; Photo by Linda S. Velazquez, September, 2008
The Allen & Overy LLP HQ, Bishops Square is located at: One Bishops Square, London, E1 6AD, United Kingdom; visit their website here. See the Fosters+Partners case study here. Read Linda Velazquez's Sky Gardens Blog post of 7.17.11. Information was also obtained from the November 2005 "Living Roofs: Case Studies - London?s most underused asset is just above our heads" from the then Mayor and his Architecture and Urbanism Advisor Richard Rogers. Read about the following companies in The Greenroof Directory: ZinCo and Alumasc. Both the 2010 and 2008 World Green Roof Congresses were held here in September of each year - read Linda Velazquez's post about the WGRC 2008 in the Sky Gardens Blog here.
 
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