What Is Ground Gas Protection?

Gas protection is a technical solution designed to prevent and control gas penetration into your home, property or structure. On land that is affected by permanent ground gas or a volatile organic compound contamination. Ground Gas Protection Systems should be designed with just one focus “Reducing the risk and prevention of hazardous gases”. A ground gas protection system should cover; structural barrier, ventilation protection, membranes and monitoring and detection.

What Ground Gases Are Dangerous To Homes And Structures


Hydrocarbons are derived from the petrol chemistry industry and are highly toxic in nature. Most of these hydrocarbons have the potential to cause cancers.


Methane is an odourless and flammable gas that is highly explosive when released into the atmosphere at levels as low as 5% and exposed to an ignition source. Methane is formed when there is a degradation below ground of organic substances such as landfill sites, sewage treatment areas, mining operations and peat bogs.

Carbon Dioxide:

Carbon Dioxide is an odourless and colourless but toxic gas. In particularly high concentrations it can result in asphyxiation. The gas is formed by the oxidation of carbon compounds such as that which naturally occur in landfill sites. When the Carbon Dioxide levels reach a concentration of 3%, symptoms including headaches and shortness of breath occur, and this becomes severe at 5%, and concentrations of 7 to 10% will cause suffocation.


Radon occurs naturally in the environment and is radioactive, colourless, odourless and tasteless. Radon can migrate into any building that is built over a source. If then it accumulates in a building or structure, it increases the risk of lunch cancer for the occupants.

Radon is the cause of 15% of lung cancers worldwide (WHO 2009) and needs to be monitored accordingly. Dangers of radon gas article (NHS).

What Are Volatile Organic Compounds?

Volatile Organic Compounds are organic compounds that easily volatise under existing and normal atmospheric conditions and environments to become vapours or ground gases. Along with carbon, they contain elements such as hydrogen, oxygen, fluorine, bromine, sulphur or nitrogen.

Typical VOC’s encountered on brownfield and industrial sites include: Petroleum, benzene, toluene, butylbenzenes, chlorinated ethenes and more. VOC’s in the air react with oxides of nitrogen in the presence of sunlight to form ozone.

How To Protect Buildings On Contaminated Land

Orchard Preservations are a registered installer of Memtech Ground Gas Protection Membranes and Venting Systems. These systems are critical for developments constructed on sites affected by ground gas and VOC contamination. Call us on 01395 233436

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How To Protect Your Property From Ground Gases