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Newton 420 Reservoir

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 20mm-deep green roof membrane.

When the water holding cups are full, the large drainage holes within the HDPE core allow water to easily pass through to the drainage layer below to prevent saturation and water logging of the green roof above.

  • Key Benefits
  • Typical Applications
  • Technical Data
  • Key Benefits

    Key Benefits

    • Unique bonded geotextile does not sag into the water holding cups as is the case with loose laid geotextiles.
    • Large drainage holes allow a much higher drainage flow through the membrane than comparative products, ensuring that when the water holding cups are full, the water drains quickly so as not to waterlog the soil.
    • Suspended soil particles (fines) are filtered out by the geotextile layer.
    • Large drainage layer created by the 20mm HDPE core.
    • Tough and durable.
    • Quick and easy to install.

    Typical Applications

    Typical Applications

    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.

    Technical Data

    Technical Data

    Installed Performance Result
    Water-flow at 20 kPa – 1:80 slope – Upper layer 0.07 l/m/s
    Water-flow at 100 kPa – 1:80 slope – Upper layer 0.04 l/m/s
    Water-flow at 200 kPa – 1:80 slope – Upper layer 0.02 l/m/s
    Compressive strength – Temporary loading >240 kPa
    Compressive strength – Permanent loading >120 kPa
    Water vapour diffusion resistance – Sd value >604m
    Water vapour diffusion resistance – µ value >1208000µ
    Water vapour diffusion resistance >3020 MNs/g
    CBR puncture resistance 2800.00 N
    Tensile strength (Machine direction) 19 kN/m2
    Tensile strength (Cross direction) 10 kN/m2
    Chemical resistance Excellent
    Oxidation resistance Excellent

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