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Protech VOC Flex - East Calder

The new development of 2 residential properties at Lime Kilns, East Calder in Scotland has been provided with a high-quality VOC protection barrier in the form of Protech VOC Flex from the A. Proctor Group.

Prior to construction and in line with the guidance and legislation for brownfield site developments, an investigation of the site revealed the presence of historic VOCs. In full compliance with CIRIA C735 and the guidelines laid out in the British Standard 8485:2015 (+ A1 2019) and CIRIA C748, the geomembrane was installed by the specialist gas membrane contractor Structureseal Services. As laid out in CIRIA C735 the VOC geomembrane was thermal heat welded and all joints air lance tested in accordance with ASTM D4437-08 2013 in conjunction with the third-party validation engineer. The thermal heat welded joints were carried out by approved NVQ Level 2 gas membrane installers, including the installation of the A Proctor Group’s Provoid 25 cuspated geocomposite subfloor venting blanket to form a passive dispersal layer in conjunction with Provoid ground mounted gully vents to the perimeter of the houses. This combined achieved a “very good performance” passive venting installation fully compliant with BS8485:2015 (+A1 2019) Table 6.

Martin Taylor, Commercial Director of Structureseal Services commented, “we have successfully used Protech VOC Flex on several VOC vapour protection projects. It offers high-performance protection in compliance with CIRIA C748, is extremely robust and has many benefits which make it easy to install on site. One of these being that when the geomembrane is folded the product has “memory”, which enhances the speed, finished appearance and quality of the overall installation.”

The A. Proctor Group has over twenty years of experience in providing solutions for the safe development of brownfield land, and a range of ground gas protection products to make the development of these sites safer and easier. Following extensive research and development, Protech VOC Flex was introduced as a high-class performance VOC membrane, part of the Group’s comprehensive range of ground gas protection products. Protech VOC Flex is a 6-layer flexible proprietary reinforced VOC gas barrier suitable for use on brownfield sites that require protection from dangerous contaminants.

The A. Proctor Group’s expert design and specification advice allowed the project at East Calder on behalf of Concept Completed, to achieve a fully compliant design for ground gas protection measures for the project. Working with developers, specifiers and contractors the A. Proctor Group can provide safe, cost-effective and value-engineered solutions. Technical services include CAD detailing and project-specific recommendations utilising the latest guidance and ensure compliance with current legislation and standards including the BS8485:2015 (+ A1 2019) and CIRIA C748. Site Investigation Reports and Gas Monitoring Results can be reviewed and specialist advice can be provided to ensure full compliance and correct product selection.

Ground works project in Stirling

Protech VOC Flex

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Material Properties

Protech VOC Flex

Property Test Method Result
Roll Size - 50 x 2 m
Thickness - 0.55 mm
Weight ISO 536 564 gsm
Tensile Strength EN 12311-1 MD 700 / CD 640 N/50mm
Elongation EN 12311-1 MD 30% CD 25%
Nail Tear Resistance EN 12311-1 MD 500 / CD 540 N
Methane Permeability ISO 15105-1 ≤0.1 ml/m2/day
Determination of Chemical Resistance EN 14414 Methods A-D Pass - No visual degradation
Resistance to Naphthalene ISO 15105-2 (EN 14414 Method C) Pass
Resistance to Benzene ISO 15105-2 (EN 14414 Method C) Pass
Resistance to Toluene ISO 15105-2 (EN 14414 Method C) Pass
Resistance to Hexane ISO 15105-2 (EN 14414 Method C) Pass

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.


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For any building to have an energy efficient, healthy, moisture free building envelope there is a clear need to manage the balance of Heat, Air and Moisture movement (HAMM) throughout the building’s life cycle from design, construction, completion and use.


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.




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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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.




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





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