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Protech GM+


Protech GM+ Gas Membrane is a reinforced LDPE, loose - laid, gas barrier that provides maximum protection from the ingress of Methane and Carbon Dioxide on lower risk sites.

The membrane is fully compliant with the recommendations made in Ciria 665, BS8485 and 'The Local Authority Ground Gas Handbook' when installed, in accordance with BRE 414.

Protech GM+ is a high performance proprietary reinforced gas barrier that has been specifically designed to conform with the latest guidance documents.

  • BBA Certified
  • Full range of accessories to ensure that the membrane is gas tight
  • Suitable for protection against methane on low risk sites as defined by Ciria 665
  • Reinforced for superior tear resistance and reduced elongation
  • More flexible than 2000g DPM's, easier to lay and does not suffer from creasing
  • Manufactured from High Grade Virgin Polymer

Protech GM Plus

Literature Download


BBA Certification


BIM & Specifications

NBS Logos 360x317

CAD Details


UK Availability


Worldwide Availability


Related Products

Protech GM Super


Reinforced LDPE gas barrier incorporating aluminium foil. Protects against the ingress of Methane, Carbon Dioxide and Radon.



25mm geo-composite void former. Used with air inlets and outlets to dilute harmful gases and meet site requirements.

Protech GM Plus


Reinforced LDPE loose laid gas barrier that protects against the ingress of Methane, Carbon Dioxide and damp.

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  01250 872 261

  01250 872 727


  A. Proctor Group Ltd., The Haugh, Blairgowrie, PH10 7ER



"As a roofing contractor specialising in the larger, more prestigious, type of project, we prefer to use only the highest quality products. Therefore we use Proctor Roofshield wherever possible; we have been using it for over 15 years, together with their condensation risk analyses and U-value calculations."

Mike Camilleri - Camilleri Roofing



Innovative Construction Products for Over 80 Years.