Brown roofs offer the same advantages as biodiverse roofs but without any plant material being added at the point of installation. Plant material can either blow in from the local environment or be introduced by birds.
Blackdown would not recommend the use of site derived soils and sub-soils to be used on the roof in lieu of a proprietary biodiverse substrate of known composition.
These roofs are not designed to be trafficked and can be installed on flat to shallow pitched roofs.
Planting and Waterproofing
Typically, the substrate is mounded to offer localised habitat variation, the depth of the brown roof could vary be between 92-170mm and have a saturated weight of approx. 115-215kg per sqm, depending upon the depths of the substrate.
No planting is provided upon installation. Typically, any plant material is introduced from external sources.
Installation and Maintenance
Blackdown's systems can be installed either by their installation teams or by Alumasc's nationwide network of Registered Contractors.
Despite the initial lack of plant material associated with a brown roof, it’s still important to provide an appropriate level of maintenance as listed for other extensive roofs.
No temporary irrigation is required.