SEL GroundGas Protection Solutions

SEL Environmental Ltd     Tel: 01254 589987     Email:

Turnkey Solutions - from Site Investigation to Validation

SEL offer the reassurance of a single point of contact to all parties involved in the design, supply, installation and validation of a complete gas protection system. All solutions will be CIRIA, NHBC & Building Regulations compliant with supporting calculations and CAD details with particular consideration of system performance, constructability, risk assessment and architectural aesthetics with access to a range of vent outlets developed to satisfy the requirements of Client and Architect. 

Site Investigation
gas monitoring

SEL can provide advice and guidance with regard to carrying out a robust site investigation including gas monitoring. We can then review these reports and advise on options for compliance to current guidance and legislation.

System Design
ground gas protection

Full ground gas protection system design available for buildings, external areas and perimeter protection. All solutions will be CIRIA, NHBC & Building Regulations compliant with calculations and CAD details.

gas barrier membrane

SEL are a specialist installer with over 20 years experience in this field, qualified to NVQ Level 2 in Gas Membrane Installation as recommended in CIRIA C735. All SEL installers hold CSCS cards.

gas validation report

We can coordinate independent 3rd party validation ensuring your project complies with the relevant building regulations. You will receive a full validation report for submission to the Local Authority to show compliance.


SEL have good close working relationships with many of the recognised key suppliers in the gas protection market such as Proctor Group, Juta, Visqueen and Cordek. These relationships offers an unrivaled expertise to ensure correct product specification, application and installation. With over 20 years of experience of installing passive and active gas protection systems, SEL have the knowledge and experience to deliver a quality assured, trouble free installation.

protech membrane
juta membrane
visqueen membrane
cordek ventform
Complete Solutions

SEL can provide complete Ground Gas Protection Systems in accordance with Ciria C655, Ciria C735, NHBC traffic lights and current building regulations. We offer different gas barrier membrane systems such as carbon dioxide barrier, methane barrier, radon barrier or VOC hydrocarbon barriers. We are a recognised installer of Cordek ventform, Juta membrane, Protech membrane and Visqueen membrane. We have a standard range of ground level vent, vent bollard and vent stack or can manufacture bespoke vents to suit Client architectural requirements. If required we can assist with the arrangement of third party gas monitoring or third party gas validation report.

constructionline gold member
iso 9001
Virtual Gas Curtain - Gas Migration Barrier
gas vent trench

The SEL Virtual Curtain Gas Migration System is the ideal solution to intercept, treat and control lateral migrating ground gases. The system has been used on numerous commercial and residential projects, on and near brownfield development sites over the last 20 years and is a cost effective alternative to traditional gas vent trench methods which use vertical membrane barriers and gravel vent media to deal with lateral migrating gases.


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