Visqueen Ultimate HC BLOK

Visqueen Ultimate HC BLOK is a highly flexible 0.5 mm thick co-extruded membrane designed to comply with current guidance on Volatile Organic Compounds (VOCs) vapours and ground gases.

Manufactured using Visqueen’s advanced membrane technology and is suitable in brownfield applications which are affected by aggressive chemicals (vapour phase) such as Benzene, Toluene, Ethyl Benzene and Xylene (BTEX). The product is available in large roll formats to minimize jointing and for quick installation. The membrane is gold and white, 2440 x 41 000 x 0.5 mm (100 m²), in single wound roll format.

Features and benefits:

• Conforms to CIRIA C748 and BS 8485:2015. CE marked to EN 13967.

• Excellent VOC (vapour) and methane barrier resistance.

• Exceptional flexibility and puncture resistance.

• Comprehensively tested and validated test results.

• Easily welded, saving time and costs.

System components:

• 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.

Applications:

Suitable for the following applications:

• VOC/ hydrocarbon (gaseous phase) contaminated sites in accordance with CIRIA C748.

• Carbon dioxide and methane sites in accordance with BS 8485:2015.

• Damp protection in accordance with Building Regulations Approved Document C.

Ventilation:

Visqueen recommends when high levels of ground gases and VOCs are present in accordance with BS 8485:2015 and CIRIA C716 or when the generation of gases still occurs, then an open void beneath the ground floor should be constructed as ventilation beneath the ground floor will dilute and disperse the gases to atmosphere. Open voids are normally restricted to beam and block floors or other precast concrete floor systems. An alternative for providing ventilation to in situ concrete floor slabs is to install a Visqueen Gas Venting System.