Permavoid Geomembrane

Geomembranes are impermeable liners used in sustainable drainage systems (SuDS) to form watertight tanks. The membrane used depends on a risk assessment of the site and the ground and groundwater conditions.


The geomembrane is suitable for use in a range of applications including residential, industrial estates, swales, sports pitches, car parks, roofs, basements, pedestrian areas and rainwater harvesting.


A robust, heavy duty geomembrane resistant to puncture, this product combines excellent chemical resistance with low flexural modulus to provide a malleable, flexible membrane suitable for non-smooth surfaces and factory pre-fabrication to optimise on-site installation. Jointing shall be formed using fusion or extrusion bead welding in accordance with manufacturing recommendations.


Laying Generally
For retention and attenuation, the units need a sealed geomembrane to prevent the release of water and the ingress of groundwater. All joints should be sealed using proprietary techniques recommended by the manufacturer. Advice on seam testing procedures are as given in CIRIA SP 124:1996. Barriers, lines and cover systems for containment and control of land contamination.


Features & Benefits


  • Heavy duty polypropylene membrane
  • Used to create a water-tight construction and minimise risk of sub-grade softening
  • 100% recyclable


Literature & Technical info