Ground Gas Verification
Ground Gas Verification Services
At GeoShield, we specialise in ground gas verification, often referred to as ground gas membrane sign off, helping you stay compliant with building regulations and warranty provider clauses.
The UK’s current guidance document for ground gas protection is BS 8485:2015+A1:2019
The NHBC have their own guidance – NF94, it states:
Book Your Ground Gas Verification Today
If you need independent verification, our team is ready to help.
Contact us today to schedule an inspection visit or request a quote.
Independent Verification Testing
If your building has had ground gas protection installed – such as a ground gas membrane and ventilation – we offer independent verification testing to confirm the system has been installed as designed and to the correct standard. This ensures:
– Compliance with building regulations and national guidance
– Compliance with warranty provider clauses
– Reduced risk of future liability
– A safer environment for building users
Concrete Inspection and Testing
GeoShield provides specialist concrete inspection and testing as part of our verification services to ensure that structures are both compliant and resistant to the risks posed by ground gases.
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Detailed Reporting
Following verification, we provide a clear, comprehensive report including:
– The ground gas membrane protection design
– Data sheets for any ground gas protection components
– Photographic evidence of the installation
– Dates of Inspection and verification engineers’ details
– Weather conditions during site visits
Our reports are easy to interpret and suitable for regulatory compliance, tenant communication or internal safety management.
Ground Gas Verification in Action
Watch GeoShield perform ground gas verification services for one of our satisfied clients.
Why Choose Us?
Experienced specialists
As members of the British Verification Council, we bring proven expertise in ground gas protection, verification and integrity testing. Our team understands the technical requirements, compliance standards and practical challenges involved in delivering safe, reliable results.
Fast turnaround
We know how important timelines are. That’s why we offer efficient verification and reporting, supported by a rapid response team available within 24 hours to help keep your project moving.
Flexible service options
Whether you’re working on a residential development, commercial site or retrofit project, we tailor our service to suit your needs. From one-off testing to ongoing verification support, we provide clear, practical options that work around you.
Safety and clarity first
We take pride in delivering a thorough, professional service that gives clients confidence at every stage. Our approach is built around clear communication, detailed reporting and a commitment to protecting people, property and the environment.
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BS8485:2015+A1:2019 would be the top of the hierarchical list of documents. However, NHBC NF94, CIRIA C735, CIRIA C801 and CIRIA C748 all provide excellent information and guidance.
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Yes, all sites from CS2 up to CS6 require independent verification, clarity on this can be found in BS8485:2015+A1:2019 and CIRIA C735. It is important to understand that planning consent is dependent on fulfilling the independent verification process, failure to do so could result in planning discharge issues.
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There are several test methods available to our verification engineers when on site. The tests that will be undertaken will be noted in the pre-verification plan and would be site specific. Common tests would be pick and probe – mechanical point testing, air lancing, dielectric testing, inert gas testing and smoke testing.
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On completion a verification report will be provided, this will contain project details, drawings, and photographic evidence of the installation.
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The verification must be undertaken by an independent third party. This should not be the installer or the membrane manufacturer. BS8485:2015+A1:2019 and CIRIA C735 both provide further information on this
“Liam was professional, punctual and knowledgeable. He talked me through everything that was going to happen and again whilst he was undertaking the testing.”
J.H
