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Green roof case study - St. Martin in the fields Alumasc Exteriors Building Products

Case Study - St. Martin in the field, London

Client

St. Martins-in-the-field Girls’ School

Architect

Lyle & Winter

Main Contractor

William Verry Ltd

Alumasc Approved Specialist Sub-Contractor

Allan Roofing Ltd

Type of Development

School

Reason for Green Roof

The original roofing material specified was to be standing seam aluminium, however, Planning Officers expressed concern at pre-application stage that there may be some adverse response from adjacent residents.  The Architects came up with an alternative solution and proposed that the roof be finished with a green roof system, which the Planners wholeheartedly approved and encouraged.

Type of Roof

Extensive Green Roof

Size of Green Roof

2,000m2

Build up of Roof

The roof build up consists of curved Armaseam aluminium standing seam profiled sheet, which acts as the waterproofing substrate beneath a ZinCo green roof.

Comments

The curve of the roof profile meant that the ZinCo green roof system had to accommodate falls from 26º at the eaves to zero at the crown of the building, which lead to the development of a project specific substrate baffle retention system, which has proven to be highly successful.  As the roof slopes were so severe, the decision was made to use sedum mats at the eaves and gables, to securely anchor the substrate in position and to provide an immediate established appearance to the vegetation from ground level.  Sedum plug plants were used in the field area in order to provide a more cost-effective solution for the overall planting scheme.

Completion Date

2006