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Extensive Green Roofing Systems
SarnaVert Extensive Green Roofing systems consists of lightweight, naturalistic planting that provides extensive roof cover with minimal maintenance.
These systems provide a wide range of benefits, including:
- Little modification of the roof environment, ensuring suitability for new or refurbishment applications
- Naturalistic style planting systems, that require minimal care, irrigation and maintenance
- A thin layer of lightweight growing mediums, typically between 65mm and 150mm
- A wide range of grass, herbaceous, succulent and moss species, that establish self-sustaining plant communities
- Suitability for use on roof slopes (from 0 to 45° slope), with measures needed from 8° upwards. Pitches greater than 45° can be accommodated subject to design
- A saturated system weight of between 80 to 90 kg m². Lighter variations can be specified, but the membrane will require independent attachment
A typical SarnaVert Extensive warm roof construction will consist of:
- A structural deck
- Vapour control layer
- Thermal insulation
- Sarnafil G476-20TEX or Sarnafil TG66 membrane
- Growing medium
- Planting
The vapour control layers will either be SarnaBituVap, bonded to the substrate with Sarnacol 2142s, or loose laid Sarnavap 2000E. The main benefit of SarnaBituVap in this application, is that it enables the membrane to be installed in waterproof compartments or ‘cells’.
Following inspection of the finished roof by a Sarnafil Field Technician, the AquaDrain drainage and protection layer and site specific growing medium are installed, prior to the installation of the chosen method of Extensive greening, either hydroseeding, plug planting or Nature Mat®.
Once installed, the largely self-maintaining closely grown mosses, succulents, herbaceous plants and grasses (that make up the SarnaVert extensive system) develop naturally, with any plants that invade from surrounding areas forming part of the natural fluctuation in the vegetation.
Early consultation with a local Sarnafil Technical Adviser, will assist the correct system specification and construction. This will ensure water storage, substrate formulation and nutrient levels are optimally balanced to sustain the plants for maximum year round performance and environmental benefit.
© 2006 Sarnafil Ltd. Legal Disclaimer
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