Extensive Green Roof Systems
Extensive green roof systems are designed to support low-growing vegetation types such as sedums, grasses, mosses, and selected wildflower species. These systems typically require minimal substrate depth and are generally selected for visual integration or ecological enhancement, subject to project-specific requirements.
Vegetation used in extensive systems is suited to lower nutrient environments and may require limited irrigation depending on climate and exposure. System selection should be based on validated horticultural data and site-specific conditions.
System Features and Considerations
- Commonly specified plant types include sedums and other species adapted to shallow substrates.
- Vegetation selection should be informed by maintenance requirements, substrate depth, and local biodiversity objectives.
- Substrate depth and composition must be matched to the intended plant species and performance expectations.
- Maintenance schedules should be defined based on seasonal growth patterns and system design.
Image: Sika extensive green roof build up
SikaRoof® Extensive Green Roof System
The SikaRoof® Extensive Green Roof System includes:
- A protection fleece layer designed to safeguard the underlying Sika waterproofing membrane.
- A 20mm drainage board with integrated filter fleece, intended to retain water for vegetation during dry periods and assist in managing rainfall during storm events.
- A nutrient-rich substrate formulated to support plant growth and retain moisture.
- A pre-grown sedum blanket comprising 13 sedum varieties, selected for their suitability to extensive roof conditions and visual consistency throughout the year.
