Extensive green roof drainage membrane.
Suitable for use as a water holding and drainage layer above a deck, flat roof or pitched roof where shallow planting is used to create an extensive green roof.
A unique drainage and water-retention membrane for use where a water reservoir is required for extensive green roofs of sedum, herbaceous plants, mosses or grass above decks and roofs.
Unlike other products of this type, Newton 420 Reservoir has a bonded geotextile that prevents intrusion of the soil into the water holding cups during back-fill and compression. This results in a permanently larger volume reservoir than any other 20 mm deep green roof membrane.
When the water holding cups are full, the large drainage holes within the high-density polyethylene (HDPE) core allow water to easily pass through to the drainage layer below to prevent saturation and water logging of the green roof above.
Newton 420 Reservoir should continue over construction and movement joints and acts as a decoupling membrane preventing movement from the substrate transferring through to the surface finish.
Consult manufacturer's literature for relevant surface preparation.
Features and benefits:
Studded core: Black, Geotextile: White
Wrapped label rolls which weigh 70 kg
21 x 920 x 50000 mm
J40/295 Geocomposite studded cavity drainage/ venting membrane
Q37/130 Extensive green roof
Q37/350 Drainage layer
Studded core: High density polyethylene (HDPE), Geotextile: Polypropylene.
To EN ISO 12958, BS EN 1931, EN ISO 12236, EN ISO 10319 and to EN14030/ EN ISO 13438.
Studded core: Black, Geotextile: White.
Newton 420 Reservoir (M31)
High density polyethylene (HDPE).
0.07 L/m/s (at 20 kPa), 0.04 L/m/s (at 100 kPa), 0.02 L/m/s (at 200 kPa).
Water-flow at 20 kPa – 1:80 slope – Upper layer
Water-flow at 100 kPa – 1:80 slope – Upper layer
Water-flow at 200 kPa – 1:80 slope – Upper layer
Compressive strength – Temporary loading
Compressive strength – Permanent loading
Water vapour diffusion resistance – Sd value
Water vapour diffusion resistance – µ value
>1 208 000 µ.
Water vapour diffusion resistance
CBR puncture resistance
Tensile strength (Machine direction)
Tensile strength (Cross direction)