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Product Description

The ultimate membrane protection against VOCs and Methane

■ Conforms in full to CIRIA C748 and BS8485:2015

■ Excellent VOC & methane barrier resistance

■ Utilises Visqueen’s unique advanced barrier technology

■ Comprehensively tested and validated test results

■ Flexible even at low temperatures – limits stress cracking

■ Welding and Visqueen Gas Resistant tape system options


Visqueen Ultimate VOC BLOK is a flexible membrane designed to comply with current guidance on Volatile Organic Compounds (VOCs) and ground gases. Manufactured using Visqueen’s advanced barrier technology and drawing on our extensive knowledge and expertise in gas protection, Visqueen has developed a new flexible barrier membrane suitable in brownfield applications that are affected by aggressive chemicals such as Benzene, Toluene, Ethyl Benzene and Xylene (BTEX).

The product is available in large roll formats to minimise jointing and quick installation times. The membrane is grey and black and 2.44m x 41m x 1mm (100m²), in single wound roll format and packaged in a blue outer wrap.

The membrane should be installed grey side up.


Visqueen Ultimate VOC BLOK is suitable for the following applications:

■ VOC/Hydrocarbon contaminated sites in accordance with CIRIA C748

■ Carbon dioxide and methane sites in accordance with BS8485:2015

■ Radon affected sites in accordance with BRE211:2015

■ Damp protection in accordance with Building Regulations part C Due to a diverse range of applications and variations in attack chemicals we strongly advise contacting Visqueen’s technical department for correct specification – 0333 202 6800

The innovative Visqueen Advanced Barrier Technology –

1.An advanced gas barrier structure

2.Superior physical and chemical resistant barrier properties

3. Easy & rapid welding

4.Flexibility for uneven ground contours

5.Good environmental stress crack resistance Advanced barrier technology utilises Visqueen’s extensive manufacturing technical expertise and experience to ensure buildings and occupants are safe from hazardous ground gases and VOCs.

System Components - All can be purchased in addition from Miers 

■ Visqueen GX Double Sided Bonding Tape

■ Visqueen Gas Resistant Lap Tape

■ Visqueen Surface DPC Fixing System

■ Visqueen GX DPC

■ Visqueen GX Top Hat Units

■ Visqueen Detailing strip Please note that the membrane can be welded as a preferred alternative to using tapes.