Extensive | inverted roof

The ideal system for installing a maintenance-friendly extensive green roof with sedum, herbs and grasses. Suitable for roofs with an inverted roof construction.

All systems for extensive green roofs, with the exception of steep (pitched) roofs, is also applicable for an inverted roof construction. With an inverted roof, the insulation is above the waterproofing membrane. The other layers of the structures remain the same.

As with the other extensive applications, we show the possibilities here in terms of substrate height and type of vegetation. The insulation values are not included (see table below).

Technical data

Cuttings
Plug plants
Blankets
Recommended substrate height
approx. 80 mm
approx. 80 mm
approx. 50 mm
Total system height
approx. 108 mm
approx. 108 mm
approx. 168 mm
Total system weight, dry
approx. 62 kg/m²
approx. 62 kg/m²
approx. 93 kg/m²
Total system weight, saturated
approx. 87 kg/m²
approx. 87 kg/m²
approx. 129 kg/m²
Water buffering
approx. 26 l/m²
approx. 26 l/m²
approx. 26 l/m²
Run-off coefficients
Cs = 0.4-0.5
Cs = 0.4-0.5
Cs = 0.4-0.5
Type of vegetation
Extensive vegetation
Extensive vegetation
Extensive vegetation
Slope in degrees
1.5° - 15°
1.5° - 15°
1.5° - 15°

Example composition

Extensive vegetation (blankets, plug plants or cuttings)

ND 4+1h Drainage System; filter layer, drainage layer, protective layer and water buffer layer glued to one product.

Thermal insulation

Root-resistant waterproofing membrane

from approx. 108 mm
from approx. 61 kg/m²
from approx. 87 kg/m²
from approx. 26 l/m²
Cs = 0.4-0.5
1.5° - 15°

Suitable for standard and inverted roof constructions

The core of this extensive green roof is formed by the ND 4+1h Drainage System on a roll. All ND +1 Drainage Systems (ND 4+1, ND 4+1h, ND 5+1, ND 6+1, ND 6+1v) can be used with both standard roof constructions and inverted roof constructions. They are all equipped with a perforated core and separating geotextile (not a slip film) so that the water vapor from the XPS insulation can evaporate freely with an inverted roof. The suitability of the thermal insulation has to be proven by the insulation supplier.

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