Biodiverse or Brown roofs 

Construction techniques for biodiverse (previously known as Brown Roofs) follow the same principles as other green roof system (protection layer, drainage layer, a filter fleece and growing medium). However the surface finishes are very different, vegetation is normally established with British native plugs and seeds, over a range of different depth of substrate, typically 80-150mm.

The aim of a biodiverse roof is to replicate as far as is practical the ecological requirements for the local area. The natural habitats created are designed to support a variety of plants, birds, animals and invertebrates. The careful design and construction of these habitats is key to conforming to the local Biodiversity Action Plan (BAP).

Bauder biodiverse roofs are the only roofs to be approved by Buglife (the invertebrate Charity). With additional aggregate (stone and sand) organic matter (dead wood, site harvested topsoil and dew ponds) designed to form a matrix of different habitats ideally suited to insect life.
Living and biodiverse roofs play an extremely important role in the modern urban environment, effectively creating habitat stepping stones that enable pollinators and other invertebrates to traverse an otherwise barren and hostile urban landscape. Many such living roofs can form key planks in the national B-Lines network or create the right habitat for a rare species in an Important Invertebrate Area.
Buglife – the Invertebrate Conservation Trust