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Protech Radon 400

Protech Radon 400 is a high performance proprietary reinforced radon barrier. Due to its unique composition, the membrane is extremely robust and flexible and, therefore, easy to install on site.
It can be jointed with use of our Protech tapes or heat welded. Protech Radon 400 also acts as a high performance damp proof membrane, therefore there is no need to install a separate DPM.

  • Robust and flexible
  • Easy to install
  • Wide temperature range
  • BBA Certified

Installation Guides
Material Properties
UK Availability
CAD Details
Global Availability

Material Properties

Protech Radon 400

Property Test Method Result
Roll size 2 x 50 m
Thickness EN 1849-2 0.43 mm
Weight EN 1849-2 400 g/m2
Sd value EN 1931 290 m
Resistance to static loading EN 12730 method B 20 kg
Water tightness EN 1928:2000, Method A (2kPa Pressure) W1
Against heat ageing (EN 1296) EN 1928:2000, Method A (2kPa Pressure) W1
Against chemicals (EN 1847) EN 1928:2000, Method A (2kPa Pressure) W1
Tearing strength - MD EN 12310-1, mod with EN 13859-1:2010 Annex B 320 N
Tearing strength - CD EN 12310-1, mod with EN 13859-1:2010 Annex B 330 N
Tensile strength - MD EN 12311-1, mod with EN 13859-1:2010 Annex A 385 N/50 mm
Tensile strength - CD EN 12311-1, mod with EN 13859-1:2010 Annex A 295 N/50 mm
Elongation - MD EN 12311-1, mod with EN 13859-1:2010 Annex A 20 %
Elongation - CD EN 12311-1, mod with EN 13859-1:2010 Annex A 17 %
Foldability at low temperature EN 495-5 Pass -45 °C
Radon transmittance SP method 1.4.10-8 m/s
Radon permeability SP method 6.0.10-12 m2/s

UK Availability

North East Scotland & Islands
Linda Kay
Regional Sales Manager


South London & South East
Josephine Matchette
Regional Sales Manager


Wales & South West
Marc Blackie
Technical / Regional Sales Manager

07968215 755

North London & East England
Ben Cremer
Technical / Regional Sales Manager


Head Office
The Haugh

Kieran Basi
Regional Sales Manager


Anthony Ruth
Regional Sales Manager

Global Availability

North America
Jeff Dibdin
International Account Manager.


South America
Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.


Jeff Dibdin
International Account Manager.



Support at every stage - from site investigation to validation

  • 1 Site Investigation

    Step-1Site Investigation Reports including Gas Monitoring Results. We can review these reports and advise routes for compliance.
  • 2 System Design

    gas-Protection-System-Design-930x550Full Ground Gas Protection System Design available. CIRIA, NHBC & Building Regulations compliant.
  • 3 Specification

    Step3Ease of specification with full NBS Plus specifications available for every product. Wide library of standard details with site specific details on request.
  • 4 Installation

    Telephone-Support-930x550-1We are linked to Specialist Installers who are qualified to NVQ Level 2 in Gas Membrane Installation as recommended in CIRIA C735.
  • 5 Validation

    Step-5We have close links with independent 3rd party validation professionals, ensuring your project complies with the relevant building regulations.



New 'Protech Radon 400' Gas Membrane Added to Product Portfolio

Radon protection has become a hot topic for the industry. Once regarded as something only to worry about in specific regions of the UK, experience has led to a more robust approach to assessment and mitigation in recent years.

The reason for radon’s low-profile is evident in its infamous moniker: “the quiet killer”. Compared to other dangerous ground gases like carbon dioxide or methane, the consequences of over-exposure to radon are felt less quickly and experienced less dramatically.

That’s not to say radon is any less dangerous than CO2 or methane. The British Medical Journal estimates in-home radon poisoning is linked to over 1000 deaths in the UK every year, and rates radon as the second-highest contributor to lung cancer behind smoking.

The main challenge of dealing with radon is that there is no practical way of eliminating or neutralizing its source. Contrasted with other ground gases that are the result of pollution or historical land usage, radon is the product of natural geological processes that have been going on for eons. High radon concentration is linked to the regions in the UK with the most granite bedrock such as South West England, the Peak District, and Aberdeenshire.

The only way to manage the risk of dangerous in-house radon concentrations is to prevent the radon from getting indoors in the first place. The most common way to do this is through the installation of a ground gas barrier membrane.

There are some key considerations when choosing an appropriate radon membrane:

  • Meets Guidance Requirements: The BBA requires membranes to be a minimum 0.4mm (400 microns) thick to be eligible to be called a radon barrier
  • Good Strength and Elongation Properties: This is particularly important for membranes being installed under solid concrete slabs, as the concrete pour may stretch weaker membranes.
  • 'Thicker’ Doesn’t Mean ‘Better’: Membranes that are significantly thicker than 0.4mm may provide specifiers peace of mind but will more difficult to install on-site. Cumbersome membranes may work against fine detailing work in corners and around floor penetrations, resulting in an imperfect ground gas seal and costly remediations.

In response, the A. Proctor Group Ltd. have unveiled their latest ground gas protection membrane: Protech Radon 400. This membrane is reinforced to resist stretching and elongation, and can be used with both solid and suspended ground floor applications. Made of virgin material, Protech Radon 400 is extremely robust but remains flexible and easy to handle, even at very low temperatures. The membrane junctions can be taped or welded and, at just over 0.4mm thick, makes detailing quick and easy




ground gas accessories

Our new Ground Gas Protection Accessories Brochure is now available. Download it for complete information on our range of Protech and Provoid Ground Gas accessories.







Check our Building on Contaminated Land: VOC Barrier Membranes Webinar Page. Here you will find video replay, downloadable video, transcript & downloadable PDF transcript of our Webinar, hosted by our Managing Director, Keira Proctor.




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Ground Gas Installation

There are many potential weak spots to consider when installing a gas protection system. Maintaining a continuous gas tight seal is vital in ensuring that the system performs as it was designed to. Read our article to learn the correct way to deal with corner sections, pipe penetrations & stanchion details.



The Haugh

The A.Proctor Group operates out of The Haugh in Blairgowrie, which has belonged to the family since the early 1900’s and now acts as the Head Office for the Administration departments and Customer Services.



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  8:30am - 5pm, Mon - Fri

  01250 872 261

  01250 872 727


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





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