Powerbase VOC Barrier

Powerbase VOC Barrier

  • Multilayered barrier membrane for methane, radon, CO2, hydrocarbons and volatile organic compounds (VOCs)
  • Independently tested to ISO 15105-2
  • Compliant to BS 8485:2015
  • CE Marking
  • High tear and puncture resistance
  • Available in rolls for joining on site
  • Prefabricated panels option for specified footprints
  • Also acts as a damp proof membrane
  Powerbase VOC
Thickness 500mu
Tensile Strength MD 435N/50mm
XD 430N/50mm
Gas permeability Benzene 4000mg/m2/day
Toluene 4000mg/m2/day
Ethyl Benzene 500mg/m2/day
Xylene 800mg/m2/day
Radon 1.0 x 10-14m2/s
Methane 0.140ml/m2/day/bar
CO2 3.010ml/m2/day/bar
Colour Green/Blue
Standard size 3.0 x 50m


CE-ISOQARPowerbase VOC is a multilayered hydrocarbon and chemical resistance barrier membrane with exceptional resistance to commonly found hydrocarbons and volatile organic compounds (VOCs).

Using the advanced technology of a composite membrane, Powerbase VOC comprises protective polymeric layers on both sides of a hydrocarbon and chemical resistant inner core.

Powerbase VOC has CE Marking for use as "Flexible sheets for waterproofing –Damp proof sheets (EN 13967: 2012) and hydrocarbon and chemical resistant geosynthetic membrane." The membrane has been independently tested to ISO 15105-2 and is compliant to BS 8485:2015. 

Industrial Textiles & Plastics Ltd is ISOQAR Quality Assured and certified to ISO 9001. 

Powerbase VOC is supplied as rolls for joining on site as standard.

ITP's Geomembranes Team provides technical support and customer-specific service. Contact them on +44(0)1347 825201 or email powerbase@itpltd.com.

See Tech Base for more information about Compliance and Certification.



VOCs are commonly found in man-made paints and solvents, adhesive removers and cleaning products. They are also found in fuels and are used in the production of some synthetic products including plastics.

The effects of exposure to VOCs on human health are far-reaching and some compounds are carcinogenic. The use of a barrier membrane such as Powerbase VOC dramatically reduces the permeation rates VOCs, rendering contaminated sites usable.

Powerbase VOC Barrier provides effective protection on contaminated land and brownfield site developments by preventing harmful gases migrating into buildings. Other applications include environmental protection, secondary containment, and water resource and groundwater protection.

Powerbase VOC is suitable for sites requiring NHBC Green, Amber 1 and Amber 2, and Red gas protection measures.


Typically, an impermeable barrier is designed in the foundations of the building over a high permeable ventilation layer. Hazardous gases and VOCs migrate up through the soil and collect under the membrane in a sump from where they are vented and safely dispersed into the atmosphere. The principal function of the gas barrier membrane is to prevent harmful gases from entering the building through cracks, construction joints and service openings in the floor slab. The membrane should cover the whole plan area of the structure to all external faces in order to seal the ground slab as well as any cavity walls and voids in hollow concrete block work.

Typical use is for covered installations with a low level of mechanical constraints and no risk of puncture or abrasion.

Powerbase VOC can be joined on site with hot-air/hot-wedge welding or (in certain applications) taped with Powerbond Double-Sided Jointing Tape. It is important to note that the shelf life of self-adhesive products is limited: usually between 6 months and 1 year when protected from direct sunlight and ambient temperatures above 30°C.

Certification and Compliance

Alongside CIRIA and the British Standards Institute, ITP contributed to the latest standards. Within CIRIA C748 Guidance on the use of plastic membranes as VOC vapour barriers, more comprehensive and specific requirements are demanded.

Any membrane now claiming to be used as a "Hydrocarbon resistant barrier" must show the listed chemicals and their permeation rates on the data sheet, and the permeation rates must be to the latest ISO15105-2 permeation test.

Powerbase VOC vs HDPE Permeation Chart

CE Marking is required for many products. It

  • shows that the manufacturer has checked that these products meet EU safety, health or environmental requirements
  • is an indicator of a product’s compliance with EU legislation
  • allows the free movement of products within the European market

BS 8485:2015 is the code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.


Powerlon VOC App on Smartphone

ITP's in-house IT department has worked alongside our Geomembrane Team to produce a unique App designed to give users instant access to permeation rates of contaminants based on the ground soil analysis.

The App is free, easy to use and offers instant results.

The user inputs the contaminants found into the App which generates immediate permeation results for both Powerbase VOC membrane and HDPE type membranes, allowing effective comparison.

Register for and access the Powerbase VOC app. For more contact ITP's Geomembranes Team by email powerbase@itpltd.com.