Premseal GMA Self-Adhesive Gas Resistant Membrane 1.05m x 28.06m

A tough and durable self-adhesive gas resistant membrane ideal for external tanking when waterproofing below ground in gas affected areas

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Availability: Out of stock


RRP £262.50 Ex VAT
£187.50 Ex VAT £225.00 Inc VAT

Gas Resistant Self-adhesive Membrane

This self-adhesive gas resistant membrane from Premseal is a tough, self-adhesive sheet designed for gas proofing. It is primarily used as an external tanking membrane when waterproofing below ground structures. It should be used in conjunction with PermaSEAL 8 Geodrain Membrane

It can also be used as a tanking membrane or damp proof membrane in vertical and horizontal applications.

The membrane is constructed from an aluminium / polythene laminate that is coated on one surface with a layer of self-adhesive polymer modified bitumen. This durable gas-resistant self-adhesive membrane has an overall thickness of 1mm. 

Applications for self-adhesive gas membrane

The membrane is suitable in the following situations: 

  • landfill sites
  • radon-affected areas 
  • redeveloped contaminated sites e.g. town gasworks and tunnels

Installing a self-adhesive gas resistant membrane

Start by ensuring that all vertical surfaces on which you are installing the membrane are free of loose mortar and dust. They need to have a smooth finish. Brickwork and blockwork should be dry and pointed or rendered.

It is advisable to seal the surface with our Self Adhesive Tanking Primer which must dry thoroughly prior to installation. Pressure must be applied to the entire surface of the membrane on installation to ensure good adhesion. All laps and joints must be a minimum of 150mm and rolled to ensure a continuous watertight bond.

Protection boards or PermaSEAL 8 Geo Drain Membrane should be used when installed externally to protect the membrane from damage during backfilling. Premseal GMA Self-Adhesive Gas Resistant Membrane should not be applied in temperatures below 5 degrees, or in wet or misty conditions.

Permagard – Providing Solutions. Inspiring Confidence. 

If you have any questions about external waterproofing, our range of self-adhesive membranes or gas membranes in general then contact our technical team. You can also read our guide to gas membrane installation.


  • Self-adhesive gas membrane for horizontal and vertical applications above and below ground
  • Tough and durable with good resistance to puncture and tearing
  • Conforms to BS 8102:2009 for Type A Barrier Protection
  • BBA Approved and CE Marking
Model: CVGRTM19
Manufacturer: Capital Valley Plastics
Packaging: Individual
Size: 1.05m x 28.06m
Coverage: 1.05m x 28.06m
Country of Manufacture: United Kingdom

Need more information?

Speak to our technical experts.
0117 982 3282

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