NexGreen Duo BB 20/200 P

Name: NexGreen Duo BB 20/200 P
Brand: NEXLER
SKU: T-NG0004-NX-P002

Perforated accumulation and drainage membrane integrated with a geotextile

Application:

Green roofs, e.g.: terrace roofs, car park roofs - extensive, semi-intensive, intensive
Water storage

Properties:

Increased compressive strength as a result of using HDPE of high grammage
High water retention
Prevents overloading of rainwater drainage systems
With evaporation and aeration perforations to allow excess water to drain away and then evaporate and aerate the substrate layer
Highly resistant to mechanical damage thanks to its unique octagonal structure
Flexible, allows easy adaptation to the shape of the roof
Resistant to weather conditions
Resistant to plant root overgrowth and decomposition

Available packaging:

30 m²

PROPERTIES OF DIMPLED MEMBRANE
Composition	high-density polyethylene (HDPE)
Colour	black
Flat edge	one-sided
Membrane thickness	approx. 0,9 mm
Dimple height	20,0 mm
Profile height	20,8 mm
Number of dimples	approx. 400 pcs./m²
Air volume between the profiles	14 l/m²
Profile-to-surface contact area	approx. 1960 cm²/m²
PROPERTIES OF GEOTEXTILE
Composition	polypropylene (PP) fibres
Colour	white
Thickness	approx. 0,8 mm
Mass per unit area	approx. 100 g/m²
Tensile strength	approx. 5,7 kN/m
Elongation under tension: - longitudinal direction - transverse direction	> 63 % > 42 %
Static puncture resistance (CBR)	approx. 920 kN
Dynamic puncture resistance	31 mm, +6 mm
Characteristic pore size	170 μm, ± 51μm
Water permeability perpendicular to the product surface	145 l/(m² ·s), -43 l/(m² ·s)
PROPERTIES OF GEOCOMPOSITE
Mass per unit area	approx. 1250 g/m²
Thickness at a pressure of 2 kPa	approx. 20,1 mm
Compressive strength	200 kN/m²
Tensile strength: - longitudinal direction - transversal direction	12,3 kN/m, -2,3 kN/m 8,7 kN/m, -2,0 kN/m
Elongation at maximum load: - longitudinal direction - transverse direction	34, ± 20% 53, ± 25%
Temperature resistance	from -40°C to +80°C
HYDRAULIC PROPERTIES OF GEOCOMPOSITE
Water collection capacity	7,0 l/m²
Hole size	5 mm
In-plane drainage capacity	i = 0,01, 20 kPa: 0,73 l/(m·s)
OTHER DATA
Roll width	2,4 m
Roll length	12,5 m
Roll weight	approx. 37,5 kg
Application temperature	from +5°C to +30°C
Reference document(s)	EN 13252:2016

Works should not be carried out during precipitation.
Lay the NexGreen Duo BB 20/200 P membrane on top of the NexGreen Geo Safe 350 geotextile laid on root growth resistant waterproofing – NEXLER Green Roof PYE PV250 S50 or NEXLER Green Roof PYE PV200 S42 (roof with classic layering) or on a thermal insulation laid on top of a waterproofing (roof with reverse layering). It is important to ensure that the transverse overlaps are not positioned in a single line and that the dimples are facing the waterproofing with the geotextile facing upwards. Lay adjacent sections of the membrane in a way that the border with the flat edge overlaps the border of the membrane without the flat edge. When two borders with no flat edge need to be joined, join them by overlapping dimples and pressing them in, the minimum width of the overlap should be three rows of dimples. In order to uncover a row of dimples, unstick and fold up a section of the geotextile. Cut the membrane in appropriate places, fitting precisely to the obstacle encountered (e.g. equipment on the roof, drainage inlets).
Before spreading the vegetation substrate or aggregate, it is recommended to weigh down the ends of the membrane so that successive strips do not shift.
Lay NexGreen Duo BB 20/200 P with particular care, avoid damaging the waterproofing and geotextile layer.
The installation of the membrane should be carried out in accordance with the technical design drawn up for the specific building, in accordance with the applicable standards and regulations. The roof system should be designed with an appropriate pitch (minimum 2%) to prevent water piling up which would adversely affect plant cultivation.
Before use, please read the application details in the product's Technical Data Sheet.

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