Methane is a colourless, odourless, flammable gas formed as a by-product of organic material breaking down. It is crucial that when gas protection is required, the site conditions, design and application are all taken into consideration to provide an impermeable membrane capable of surviving installation and subsequent traffic to protect the most valuable asset “the building” against harmful gases that can cause future problems.

The Corden EPS Methane Membrane prevents the transmission of unacceptable levels of dangerous gases and due to the nature of it’s construction and it’s resistance to damage, it overcomes problems associated with membranes of a lesser gauge.

The Corden EPS Methane Membrane is a high quality, very flexible polyethylene (LLDPE/VFPE) geomembrane produced from specially formulated, virgin polyethylene resin designed specifically for flexible geomembrane applications. The high uniaxial and multiaxial elongation characteristics of Corden EPS Methane Membrane make it very suitable for applications where a flexible, robust membrane meets the specification.

Product Specification 

Physical Description 

Thickness: 0.75mm               
Density: 0.92g/cm3 (min)
Colour: Black
Standard roll width: 5.9/2.95m

Technical Performance

Elongation at break: 800%
Puncture resistance: 195N
Tear Resistance: 70N   
Low temperature brittleness: -77ºc
Methane permeability: 2.0x10-6 ml/cm3.s
Moisture Vapour transmission: 107x10-9ml/cm3.s

Corden EPS Methane Membrane is available in standard roll sizes of 5.9m x 50m or 2.95m x 50m.
Several denominations of these sizes are available.

 

Advantages   

• Suitable for use on methane contaminated sites

• Excellent resistance to chemicals and UV radiation

  Excellent weld characteristics

• Very high resistance to puncture and tear

  Low permeability to methane

• Available 5.9m wide

  Compatible with vented systems

• All sundries available   

Installation Details

Corden EPS Methane Membrane is designed to exhibit superior welding properties, therefore, we recommend factory welding or on-site welding methods of jointing when the membrane is to be installed below a ground floor construction.
The use of Corden EPS Gas Tape for underslab applications forms a very effective Methane seal.

Placing

Although the Corden EPS Methane Membrane is a very robust material, it is advised that it should be laid on a blinded or smooth surface allowing adequate overlap for jointing between the sheets and avoiding bridging i.e. areas of unsupported membrane. A final floor covering should be installed above it and care should be taken to ensure the membrane is not damaged prior to this.
Inspect for damage and repair tears/holes with a piece of membrane sealed down with double sided tape and secured down with lap tape. Seal onto Corden EPS GR DPC to maintain integrity.
Corden EPS Methane Membrane and ancillary components must be installed in accordance with the recommendations of Building Research establishment BRE 414 “Protective measures for housing on gas contaminated land”, Ciria Report 149 “Protecting development from methane”, together with codes of practice CP102 and BUS 8102.
To avoid slip or shear planes, it is not recommended to take membranes through the wall. In order to provide a continuous barrier across the cavity Corden EPS DPC should be sealed to the membrane, taken through the blockwork, up the wall and incorporated below the damp proof course on the outer leaf.
Corden EPS DPC should be installed in accordance with BUS 8215: 1991, BUS 8000: Part 3, 1989 and BUS 5628: Part 3: 1985. All horizontal DPC’s must be bedded on both sides with fresh mortar. All DPC’s must project through the full width of the wall, including any externally applied rendering and project 5mm beyond the finished external face.

Ancillary Products

• Corden EPS Geovent

• Corden EPS Geovent Connectors

• Corden EPS Pervients

• Corden EPS Gas Collector Pipe

• Corden EPS Gas Tape

• Corden EPS Lap Tape

• Corden EPS Top Hats

• Corden EPS GR DPC

• Corden EPS Vent Boxes

• Corden EPS Vent Stack and Cowl

• Corden EPS GRM and Prime

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