GEOSYNTHETIC ENGINEERING

Details

All Proctor gas membranes are fully reinforced to ensure they are robust enough to withstand the construction phase intact and fully comply with the recommendation for gas membranes in Table 8.6 of the Ciria Report 659 "Assessing risks posed by hazardous ground gases for Buildings".

Backed by the additional reassurance of stringent independent testing, the Proctor gas membrane range is complemented with a variety of compatible sealing tapes, tophats and self adhesive flashings to ensure a permanent gas tight seal that will keep future occupants of any developments safe from harm. 

Why choose a Proctor Gas Membrane?

• Environmentally friendly geosynthetic alternatives to costly aggregate solutions for gas protection and porous pavements
• Real 'value engineered' designs that save you and your client money
• Access to highly trained personnel for up-to-date advice and assistance all the way through your project
• Constructable cost-effective solutions to even the most complex problems, often on sites where others have failed
• CPD presentations to keep you and your clients up to date with the latest on best practice and building regulations

Gas Overview

Landfill Gas

The two principal gases of concern are carbon dioxide and methane. These gases make up the main components of landfill gas. Landfill gas is produced by the breakdown of organic material by micro-organisms under oxygen free conditions (anaerobic). 

Methane and carbon dioxide are not unique to landfill and can also be associated with the following:

• fill or made ground containing biodegradable organic material
• wetlands/soils with a high organic content
• coal measures and underground mine workings
• inert fills containing ash and foundry sands
• soil gases migrating from nearby source

Methane Gas (Explosive)

Methane can form flammable and potentially explosive mixtures in air when ignited. The flammable or explosive range of methane is between 5% and 15% by volume in air. The concentration limits are commonly known as the “Lower Explosive Limit” (LEL) and the“Upper Explosive Limit” (UEL) Concentrations above the UEL should not be considered safe as dilution with air will cause the composition to fall within the flammable range. The presence of significant concentrations of carbon dioxide will affect the flammable range of methane and when the oxygen content is depleted, methane, either in isolation or when mixed with air, can lead to asphyxiation. A concentration of greater than 1% methane in a confined space is considered hazardous in Waste Management Paper No 27.