Along with soil types and water table levels, ground contaminates and gases such as Radon & Methane must be considered when deciding upon a waterproofing design.
Radon is a naturally occurring radioactive gas that is found within certain areas of the country and maps are available in BRE Digest 211 ; RADON Guidance on protective measures for new buildings.
Landfill gas is produced by the breakdown of organic material. The principal components of landfill gas are methane and carbon dioxide, and only specifically approved membranes should be used to prevent the ingress of such gases.
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