Proud to be the co-authors of CIRIA C735
Proud to be the co-authors of CIRIA C735

Q. Do I need to have my membrane/venting verified?

A. Yes ALL remedial works carried out on contaminated sites require a degree of verification and sufficient lines of evidence need to be provided to the regulator. Gas barriers are installed on contaminated land and therefore they require verification.


Q. Can I get the membrane supplier or installation contractor to provide a verification report of the installation?

A. The Environment Agency recommends that conflicts of interest in verification should be avoided (Environment Agency, 2010a) . "A contractor or gas membrane supplier certifying their own work or product is considered to be a conflict of interest and is not good practice. If verification is carried out by the same company (or related company) that carried out the installation then the process, the results and report should be audited by an independent consultant" (Ciria C 735). It may be acceptable for the installation contractor to assist with integrity testing and CQA, however this needs to be agreed with the regulators and verification consultant prior to work starting.


Q. Do I need to have all the plots/areas independently inspected?

A. It is not usually a requirement to have all plots/areas independently inspected, the frequency of independent inspections will depend on a number of factors further guidance is provided in Annex 1, Example risk-based decision structure for verification and integrity testing of gas protection systems in buildings (Ciria C735).


Q. What is a Specialist Installer?

A. A specialist installer is a contractor whose operatives hold the Cskills Awards L2 NVQ Diploma in sub-structure work occupations (construction) – installation of gas membranes. An installer who has attended the Cskills upskilling course and is working towards the L2 NVQ Diploma maybe classed as a semi- specialist, however evidence and previous experience should be taken into account when deciding on the degree of verification required. In all cases where the installer has not completed the Diploma a more hands on cautionary approach should be adopted by the verifier.


Q. Is an Approved Installer the same as a Specialist Installer?

A. An Approved Installer is a company that is approved by a membrane supplier as understanding their products and systems, the approved installer may have had some basic installation training from the supplier, but the training has not been carried out to any independently approved national level. Therefore an approved installer is not deemed as a specialist unless they also have Cskills Awards L2 NVQ Diploma in sub-structure work occupations (construction) – installation of gas membranes


Q. What are the benefits of using a Specialist Installer?

A. From our experience we would always recommend the use of a specialist installer, The three main benefits are confidence that the installation will be carried out to recognised industry standards by a company that is affiliated to "The British Geomembrane Association"(BGA). The install will usually be carried out much quicker, therefore providing a benefit in terms of programming of the works, and lastly the install will be subjected to a reduced amount of independent validation in most cases.


Q. Are MEC Environmental Specialist Installers.

A. No, MEC Environmental DO NOT install gas membranes, although are inspection surveyors have completed the Cskills Upskilling Course on Gas Membrane Installations as well as spending time with specialist installers gaining hands on experience of installing gas membranes and venting systems on sites. All MEC Environmental surveyors have attended a specially tailored course provided by The Welding Institute (TWI) on carrying out the inspection of welds for various geomembrane. The course covered the destructive and non destructive testing of hot air, hot wedge and extrusion welds. Furthermore the Technical Director of MEC Environmental was commisioned by Cskills and the BGA to co-author the courses for Cskills Upskilling Course as well as the BGA's Verification and Integrity Course. MEC Environmental are one of only two companies accredited by the BGA to deliver the BGA's Verification and Integrity Course.

Integrity Testing

We can offer all recognised forms of integrity testing to liners for Gas Membranes, Suds Tanks Liners, Waterproof Membranes, Containment Membranes and Pond Liners

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