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Architect: Feilden Clegg Bradley Client: BioRegional Quintain For many projects a green roof can be an enhancement, but at One Gallions, a planned development for London's Docklands, they are a keystone of Ken Livingstone's zero-carbon policy.

Architect Feilden Clegg Bradley won a competition for the scheme - which is being carried out with preferred developer BioRegional Quintain - with a design that aims to produce a sustainable lifestyle for residents, using living roofs as a key part of its strategy for the 200 homes on the 1.2ha site. The design takes biodiversity seriously, both through planting at ground level and the specifcation of green roofs.

The project will include both biodiversity roofs and amenity roofs. The roofs on the landmark tower, the northern block and parts of the eastern block will be in the former category. Built up from rubble and gently contoured, these roofs are intended to provide habitats for black redstarts and invertebrates including the brown-banded carder bee. Stonecrop or sedum planted on the western block is intended to provide another habitat and help with water attenuation.

By contrast, the amenity roofs on several of the other blocks will include a communal greenhouse and mini-allotments. The allotments are based on the 'square foot principle', which recognises the possibility of growing up to 14 different crops in an area only just over 1 x 1m. On the oval roof of the project's energy centre, a children's playground is proposed. Safety fencing will be set back from the edge of the roof and disguised with climbing plants.

Slides will take children from the rooftop down to the communal gardens at ground level.

There will also be four different types of planting on balconies: winter-garden balconies will have a glass enclosure, allowing ornamental owers, vegetables and fruit to be grown; dry-garden balconies will use containers to grow droughtresistant Mediterranean plants that can cope with climate change; natural-garden balconies will feature contained mini-meadows; and art-garden balconies will use plants to create artwork.

The project is still at an early stage and livingroof designs are likely to evolve during detail design.

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