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Validating Gas Membranes

Gas proof resistant membranes are installed to provide protection against harmful ground gases, including; methane, carbon dioxide, volatiles, hydrogen sulphide, carbon monoxide and radon gas, from being drawn into buildings by the pressure difference that exists between the inside and outside. These gases can accumulate to dangerous concentrations and should therefore be prevented from effecting end users.

agb Environmental undertakes ground investigations for ground gasses and proposes appropriate remediation standards for gas membranes.  This includes advising our clients on the use of qualified Engineers to validate and verify gas membranes to ensure that they meet the requirements of Building Control and satisfy the requirements of planning conditions, as well as safely protecting those occupying the property.

Providing detailed ground gas risk assessments, the verification of ground gas protection membrane installation and validation reports detailing visits, membrane specification and integrity testing; agb Environmental would like to stress that this is all part of a critical stage in the ground – gas management and is emphasised in the latest British Standards, CIRIA, Chartered Institute of Environmental Health (CIEH) and NHBC documents.

If ground gas is considered a risk, it is imperative that these ground gas protection measures are designed and installed correctly, and then verified and validated with specialist inspections. agb Environmental can provide the peace of mind needed for developers and regulators to continue with the development process.

agb Environmental offers ground investigations and proposes suitable gas remediation measures to meet the requirements of Building Control and satisfy the requirements of planning conditions, as well as protecting those occupying the property.  Where verification and validation of gas membranes is required, agb Environmental can recommend and work with qualified Engineers that specialise in this service.

Your gas membranes questions…answered:

1. Which development projects require ground gas risk assessments and gas proof membranes?

Only a good quality ground gas risk assessment will be able to determine if a development requires gas membranes or other gas protection measures. As examples, developments on or near landfills (including formal landfills and infilled land), areas of extensive Made Ground, land affected by fuel products, radon risk sites, mine workings and sites with particularly high organic content, will also need these to be assessed.

2. What are gas proof membranes used for?

Gas proof membranes are used as a prevention of ingress, or redirect, ground gas and/or vapour migration that can migrate via driven flow, diffuse flow or buoyancy.

3. Why is the validation of gas proof membranes so important?

Validation must be carried out to ensure the remedial work completed has met the specification, and that all aspects of risk to the receptors must have been removed. The membranes must have approval from the LA to meet with, and subsequently discharge, the related planning conditions. Validation requirements can vary, and it is important that these requirements are detailed within your Remediation Method Statement.

Contact Alex Brearley on 01638 663226 or email for more information regarding the validation of gas proof membranes.

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