Ground Gas Venting Systems

It has become common practice within the construction industry to use a passive ventilation system beneath the footprint of the structure, in addition to an appropriate membrane.

These products are designed to initially dilute the hazardous gases to a safe level and then to disperse them into the atmosphere. This is a safer option than lesser systems that just allow the gases to disperse undiluted.

Cordek offer a unique range of gas ventilation products which have been developed following extensive research andtesting. These include the BBA approved Ventform range, Cellvent, the combined heave protection / passive venting system and radon sumps.

Consult the table below to see which Venting System is right for your project.


Provides Protection Against
Venting System Ground Heave VOC&s / Hydrocarbons Methane Carbon Dioxide Radon
Ventform / Ventform Plus
Geocomposite Vent Mat
Radon Sumps


*Please contact the Cordek Technical Team for further advice regarding the suitability of these venting systems with regards to the venting of VOC’s and hydrocarbons.

Find your nearest Technical Advisor

For international enquiries please contact Peter Blanchard

For enquiries in the Manchester or Liverpool
areas please contact James Provan

Or contact Cordek Head Office