Voltex Membrane is made up of two Geotextile membranes which are needle punched together and contain 1.1 pounds of Sodium Bentonite per sq. foot. It is an extremely durable product that does not require site concrete and can be laid directly onto clay, sand or compacted hard fill. Steel work or rebar can be laid directly on top - Voltex does not require any protection if used with 25/7 scoria. While mostly used horizontally, Voltex can also be applied vertically but not on block-work construction. The Voltex bonds itself to the concrete and becomes a permanent part of the slab or walls, also assisting in keeping moisture in the concrete and improving its curing properties.


  • Can be used in vertical and horizontal applications
  • Can be applied in wet conditions – thus saving time/money
  • Can cope with rain water for a number of days but ponded water must be removed daily
  • Meets the New Zealand Building Code durability requirement of 50 years
  • Self-healing
  • Laps 100mm
  • As the membrane is needle punched you will not experience slumpage or loss of bentonite
  • Can be applied to under floor slabs and footings, lift pit base and walls, shotcrete retention, underpinning of existing buildings
  • Durable enough to drive vehicles over