Extensive | Biodiverse roof with extra water buffer

The ideal system for installing a maintenance-friendly extensive green roof with sedum, herbs and grasses. Suitable for roofs with a higher load capacity.

The growing-medium layer of this composition consists of a combination of substrate, ND DGS-E Substrate Extensive and a substrate replacement, ND SM-50 Substrate Panels. The substrate is tailored to the needs of the vegetation. The substrate height is determined by the type of vegetation: blankets, plug plants or cuttings (see table below).

Technical data

Cuttings
Plug plants
Blankets
Recommended substrate height
approx. 50 mm
approx. 50 mm
approx. 20 mm
Total system height
approx. 127 mm
approx. 127 mm
approx. 127 mm
Total system weight, dry
approx. 61 kg/m²
approx. 61 kg/m²
approx. 43 kg/m²
Total system weight, saturated
approx. 113 l/m²
approx. 113 kg/m²
approx. 91 kg/m²
Water buffering
approx. 53 l/m²
approx. 53 l/m²
approx. 53 l/m²
Run-off coefficients
Cs = 0.4-0.5
Cs = 0.4-0.5
Cs = 0.4-0.5
Type of vegetation
sedum, herbs and grasses
sedum, herbs and grasses
sedum, herbs and grasses
Slope in degrees
1.5° - 15°
1.5° - 15°
1.5° - 15°

Example composition

Extensive / semi-intensive vegetation (blankets, plug plants or cuttings)

ND 6+1v Drainage System; filter layer, drainage layer, protective layer and water buffer layer glued to one product.

Root-resistant waterproofing membrane

from approx. 127 mm
from approx. 43 kg/m²
from approx. 91 kg/m²
from approx. 53 l/m²
Cs = 0.4-0.5
1.5° - 15°

Additional water buffering in drainage system

The core of this extensive green roof is formed by the ND 6+1v Drainage System on a roll. This multifunctional CE-marked drainage system with high compressive strength protects vegetation against water build-up and at the same time stores water in the built-in water reservoir (7.6 l/m²) for dry periods. In addition, the ND 6+1v Drainage System protects waterproofing membrane against the build-up of water pressure and mechanical loads both during and after construction.

The ND 6+1v Drainage System is easy and quick to install because the filter geotextile, drainage core with water buffering and the protective geotextile are glued together. The drainage system is supplied on a roll and is therefore easy to handle and quick to unroll.

ND SM Substrate Panels for even more water buffering

To make even more water available for vegetation, Nophadrain recommends combining all extensive green roofs with our ND SM Substrate Panels. They are made of hydrophilic (water-absorbing) mineral wool and differ in water storage capacity and density. The ND SM Substrate Panels (available in 25 mm and 50 mm) have a water storage capacity of 15 or 30 l/m². In this composition we show the ND SM-50 Substrate Panels.

The substrate panels are installed above the ND Drainage System and buffer water up to their saturation point. Because of this:
• there is more water available for vegetation,
• important evapotranspiration and the associated water cycles are promoted and
• only excess water ends up in the storm water system.

The ND SM Substrate Panels have a density of 80 kg/m³ and limited compression. Therefore, the ND SM Substrate Panels can be classified as substrate substitutes and their construction height can be deducted from the total substrate height. These properties make the ND SM Substrate Panels particularly suitable for extensive green roofs.

If the waterproofing membrane is not root-resistant, we recommend adding the ND WSB-50 Root Barrier.

View our projects

Would you like to learn more about the possibilities of our innovative Nophadrain solutions for your project? Check out our existing projects here.

Generic filters
Exact matches only
Filter by Product categorieën
Green roof packages
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Green roof packages
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Green roof packages
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Green roof packages
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers