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Ground Gas Protection Systems

Delta Membrane Systems

Gas Protection Systems

Delta Membrane Systems Limited offer a comprehensive range of ground gas protection solutions along with its structural waterproofing solutions. From our MemTech ground gas membranes to waterproofing systems, our product range is designed to deal with all ground gas, contaminants and waterproofing related problems.

Greater emphasis on appropriate gas protection measures have been brought about by the issue of BS 8485: 2015 – Code of Practice for the Design of Protective Measures for Methane and Carbon Dioxide Gases for New Buildings. All ground gas (Methane, Carbon Dioxide, Radon, VOC’s, along with others) protection systems should be designed in accordance with the most up to date Guidance and Regulations. Attention is drawn to CIRIA C665, C716, C735, C748 and BS 8485:2015. In addition there are specific requirements for building warranty providers such as NHBC.

MemTech Pro R1 - MemTech PRO R1 Gas Barrier is a flexible, loose laid proprietary gas barrier for use on sites with Radon (RN) ground gas. R1 is a three layer, low density polyethylene membrane reinforced with a polypropylene reinforcement grid. MemTech PRO R1 gas barrier membrane has a distinct Red (top) and Grey (bottom) as standard.

MemTech Pro M1 - MemTech Pro M1 is a flexible, loose laid Ground Gas Barrier Membrane made from low-density polythene with a foil core layer. MemTech Pro M1 can be used as a gas barrier and high performance damp proof membrane for application on concrete ground floors, above and below the slab (not subject to hydrostatic pressure), to protect a structure against moisture, radon, methane and carbon dioxide contaminates from the ground. MemTech Pro M1 complies with BS 8485:2015. Suitable for use on brownfield sites that require protection from dangerous contaminants such as hydrocarbons. MemTech Pro M1 has been developed to ease installation on site due to the flexibility of the membrane. MemTech Pro M1 will protect against the ingress of hydrocarbon vapours where is it separated from the ground (e.g. above a block and beam floor).

MemTech Pro Titan - MemTech Pro Titan ground gas membrane offers a safe solution for the protection of buildings, structures and occupiers against all levels of hydrocarbons, methane, carbon dioxide and radon gas ingress.

It is a hydrocarbon barrier gas membrane. This multi-layered, flexible membrane has a unique core component which is designed and manufactured to provide a barrier to the most aggressive chemicals and to comply with current guidance on Hydrocarbons.

It is suitable in applications that are affected by Hydrocarbons. There is a common misconception that monolithic polyolefin barriers, such as HDPE and LLDPE are effective barriers to resist Hydrocarbons. This is an incorrect assumption, as Hydrocarbons will readily permeate through monolithic polyolefin barriers.

MemTech Pro Titan Bond - MemTech Pro Titan Bond pre applied waterproof and ground gas membrane offers a safe solution for the protection of buildings, structures and occupiers against all levels of Hydrocarbons, Methane, Carbon Dioxide and Radon gas ingress.
It is a pre applied waterproof and hydrocarbon barrier gas membrane. This multi-layered, flexible membrane has a unique core component, with a bonded textile for pre applied applications which is designed and manufactured to provide a barrier to the most aggressive chemicals and ground water and to comply with current guidance on Hydrocarbons.

There is a common misconception that monolithic polyolefin barriers, such as HDPE and LLDPE are effective barriers to resist Hydrocarbons. This is an incorrect assumption, as Hydrocarbons will readily permeate through monolithic polyolefin barriers.

MemTech Pro Titan Tank - MemTech Pro Titan Tank post applied waterproof and ground gas membrane offers a safe solution for the protection of buildings, structures and occupiers against all levels of Hydrocarbons, Methane, Carbon Dioxide and Radon gas ingress.

It is a post applied waterproof and hydrocarbon barrier gas membrane. This multi-layered, flexible membrane has a unique core component, with a specialist all weather adhesive backing for post applied applications which is designed and manufactured to provide a barrier to the most aggressive chemicals and ground water and to comply with current guidance on Hydrocarbons.

MemTech Pro Titan Tank is suitable in applications that are affected by Hydrocarbons and groundwater. There is a common misconception that monolithic polyolefin barriers, such as HDPE and LLDPE are effective barriers to resist Hydrocarbons. This is an incorrect assumption, as Hydrocarbons will readily permeate through monolithic polyolefin barriers.

MemTech Pro Liquid Gas Barrier (LGB) Membrane

MemTech Pro Liquid Gas Barrier (LGB) is a liquid applied Gas Barrier Membrane. MemTech Pro Liquid Gas Membrane is a distinctive red, ready for use specialist styrene butadiene latex based liquid applied gas membrane. It offers a simple, continuous passive gas prevention barrier against the ingress of Methane, Carbon Dioxide, Radon, Ground Gas, VOC, air and Moisture into buildings. MemTech Pro LGB also acts as a waterproofing membrane complying with the requirement C2 and C4 schedule 1 of the Building Regulations 1991 for England and Wales.

MemTech Pro Void Vent 25 - MemTech Pro Void Vent 25 offers a passive venting solution which facilitates the dispersal and dilution of dangerous gases. MemTech’s Pro Void Vent 25 has been specially designed to provide for high levels of air and/or gas flow.
MemTech Pro Void Vent 25 is a cuspated HDPE (High Density Polyethylene) Membrane with a geotextile filter/separator. Void Vent 25 has been designed to be installed with the geotextile filter side of the product to be in contact with the ground to allow for air and/or gas flow. Void Vent 25 is available in either a 25mm or 40mm depth. MemTech PRO Void Vent 25 complies with the latest codes of practice (BRE, CIRIA and NHBC).

MemTech Pro Ancillaries
MemTech Gas Protection membranes come with a range of sealing tapes, detailing strips and ventilation accessories to optimise their installation. Generally where possible and practical joints between the MemTech Pro Membranes should be heat welded, where this is not possible or practical we recommend the use of MemTech sealing tapes and detailing strips.

Radon
Radon is a naturally occurring radioactive gas found in many structures, it is the second largest cause of lung cancer in the United Kingdom (second to smoking). Radon accumulates in buildings through cracks in rock or sub-soil caused by atmospheric pressure. Radon is frequently found in homes and workplaces, which is why Radon should always be identified if your site is in a radon risk area.

To find out if your project/property/structure is within a designated Radon area log on to Public Health England (PHE).
Radon levels vary in concentration. Whilst radon is found in open air (in very low concentrations), when it enters an enclosed spaces, such as buildings and basements, it can accumulate in high concentrations. Delta Gas Barrier System Radonsperre, Memtech M1 & R1 Membranes and Memtech LGB are suitable solutions.

Landfill Gas
The production of Landfill Gas is a recent problem; prior to the Clean Air Act 1956 all domestic waste was burnt. Organic waste produces gases. All waste (industrial, domestic and demolition) generate large quantities of Landfill Gas.

Landfill Gas is caused by bacteria. The gases produced are Methane (CH4) and Carbon Dioxide (CO2).
Carbon Dioxide and Methane are colourless and odourless Gases. Trace gases found in landfill tend not to represent a health hazard; however the distinctive landfill odour is caused by these types of trace gases.

Ground Gases
Ground Gas is predominately Methane (CH4) and Carbon dioxide (CO2) which presents a similar risk to that of Landfill Gases. Ground Gas is formed by man-made and natural occurrences. Building Regulations state that proper precautions should be taken to prevent danger to health and safety when building on contaminated land.

Carbon Dioxide (CO2)
Carbon Dioxide is commonly found in landfill, contaminated industrial sites or coalfields. Carbon Dioxide is a colourless gas that can result in asphyxiation when present in high levels.

Methane (CH4)
Methane is an odourless explosive and flammable gas that is commonly found in sewage treatment localities, peat bogs, landfill and mining sites. Methane can ignite at levels as low as 5%.

For suitable gas protection membranes for Methane and Carbon Dioxide in accordance with Table 7 BS 8485: 2015 Methane & Carbon Dioxide Permeability must be below 40ml/day/m2/atm (BS EN ISO15105-1manometric test method).

Memtech M1 gas barrier, Memtech LGB (liquid applied) gas barrier comply with the requirements of Table 7 BS8485:2015.

Volatile Organic Compounds (VOCs)

Volatile Organic Compounds (VOC’s) are generally organic compounds that are volatile under normal environmental conditions, they can be found in the ground in solid, liquid or gaseous form.

Some of the frequently encountered VOC’s on building sites on contaminated land are Benzene, Toluene, Chlorinated Solvents and Ethers.

VOC barrier membranes need to perform against specific challenge VOC’s in order to be considered a barrier. CIRIA C748 – provides guidance on the use of plastic membranes as VOC vapour barriers. BS8485:2015 – Code of Practice for the Design of Protective Measures for Methane and Carbon Dioxide Ground Gases for new buildings:

The code of Practice provides a solution choice flow chart and appropriate gas protection measures should be selected using this method based on the CS of each site.

Once CS level for the site has been assessed, the building should be categorised by building type, by combining the CS level with the building type a gas protection score can be determined. Once this is determined then using the following 3 elements a gas protection system can be appropriately designed:

• Structural Barrier (the building)
• Ventilation measures
• Gas resistant membrane

The design requires 3rd party verification along with installation monitoring in accordance with CIRIA C735.

Always ensure your gas protection products offer a safe solution for the protection of buildings, adhere to the appropriate standards and Building Regulations.


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Delta Membrane Systems

Delta Membrane Systems

Delta Membrane Systems Limited is the leading Type C Cavity Drain Membrane manufacturer in the United Kingdom being the UK arm of Dörken Gmbh & Co KG, the world's largest manufacturer of cavity drain membranes.

With over 125 years of...
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