GGS offers verification of ground-gas protection measures.  Our comprehensive ground-gas protection services include:

 

• Ground-gas emissions and ventilation calculations to support gas management designs
• Detailed ground-gas risk assessment in accordance with BS8485, CIRIA C665, “The Local Authority guide to Ground-Gas” and the NHBC
• Design support and access to design and product specialists
• Awareness training of site operatives and follow-on trades to maximise membrane integrity post installation
• On site construction quality assurance (CQA) supervision
• Verification reporting

 

Why validate ground-gas protection measures?

 

The CQA and verification of the installation of ground-gas protection measures is a critical stage in the ground-gas management and is emphasised in the latest British Standards, CIRIA, CIEH and NHBC documents.

 

Hazardous ground-gases include methane, carbon dioxide, volatiles, hydrogen sulphide, carbon monoxide and radon gas.

 

Ground-gas is drawn into buildings by the pressure difference that exists between the inside and outside.  It enters through gaps around service pipes, construction joints, wall cavities and cracks in ground slabs and floors.  Having entered buildings, ground-gas may accumulate to dangerous concentrations.

 

While damp proof membranes protect against water ingress, gas proof membranes are installed to protect life. For this reason it is imperative that the ground-gas protection measures are designed and installed correctly and are subjected to specialist inspection and verification.

Our ground-gas verification service provides peace of mind to developers, contractors, regulators and ultimately to home owners. Comprehensive Professional and Environmental Insurances can be arranged.

On completion of the ground-gas protection measures we provide a verification (site completion) report detailing all visits, membrane specification, integrity testing, construction details (plans), none conformance and correction reporting, as well as photographic evidence. The GGS Verification Report can be used to support the discharge of planning / land quality conditions and meet the needs of Building Control and NHBC requirements.