Extensive living roofs are primarily installed to provide a visual or biodiversity interest, and are less suitable as an amenity or leisure space.

Typically they have thin substrate layers to keep system depth and saturated load to a minimum and are generally designed to be low maintenance, utilising hardier, more drought tolerant plant species that do not require much up-keep or are slow growing.

They are often created to benefit the wider environment through their positive visual impact and to enhance building performance by reducing rainfall run-off and improving thermal efficiency. Extensive green roofs are normally intended to be viewed from another location as visual or ecological features, and are usually not trafficked.

Growing substrates for extensive green roofs are shallow and usually of a low nutrient base formulation, thus are able to support sedums, grasses and some wild flower varieties whilst suppressing the growth of invasive weed species. These plant types are able to survive and thrive in such conditions and when correctly designed require little irrigation beyond the establishment phase and during periods of drought. Planting styles are usually naturalistic with the object of establishing a self sustaining plant ecology on the roof.

Extensive living roof planting designs can incorporate pre-grown mixed sedum mats/blankets , pre-grown modular trays, young sedum plug plants and/or a mixed seed broadcast with plant cuttings.

CITYFLOR-HYDROLITE-V1

Benefits

  • Provides great biodiversity for flora and fauna.
  • Usually for visual purposes only, accessible just for maintenance
  • Can be laid on flat or sloping roofs
  • Minimal maintenance
  • Thin soil substrate
  • Self-sustaining vegetation such as succulents, grasses and wildflowers
  • Minimal maintenance
  • Compatible with Wilotekt-Plus and Cityflor systems
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