Blackdown Extensive

Green roofs require early stage decisions about access, maintenance, and intended use to ensure the design meets project expectations. Alumasc works closely with designers and specifiers from the outset to ensure every aspect of the brief is achieved. 

Extensive green roofs rely on hardy, drought-tolerant sedum species that form the majority of the planting. Planting can be supplied as a pre-grown NatureMat® (providing approximately 95% coverage at installation), a pre-grown tray system (typically providing mature vegetation coverage at installation), or plug plants (providing around 5-10% coverage at installation).  

To support these planting types, a Blackdown Extensive substrate is required. The substrate is composed of carefully selected organic and inorganic materials, blended in precise proportions to enable rapid plant establishment and long-term performance.

• Extensive green roofs are lightweight systems suitable for use on lightweight roof decks. They are typically used on inaccessible roofs and can be installed on flat or low pitch roofs. 
• Blackdown Extensive green roofs are compatible with Alumasc root-resistant waterproofing systems. These include Hydrotech MM6125 hot melt structural waterproofing, bituminous membranes from the Derbigum and Euroroof ranges, Caltech QC cold applied liquid systems, and Aluply single ply membranes.

• Blackdown Extensive green roofs are compliant with the Green Roof Organisation (GRO) best practice standards.
• Blackdown green roof components comply with FLL guidelines.

Warranties are available for the Alumasc waterproofing system used in the green roof build-up.