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Description Visqueen Ultimate HC Blok is a high-performance, chemically resistant barrier designed to protect against volatile organic compounds (VOCs) and gases. This 0.5mm thick co-extruded membrane features a gold upper surface and white reverse, providing durable gas and damp proofing protection. Supplied in single wound rolls (2.44m x 41m), this product meets stringent industry standards and can be used with either taped or heat-welded lap joints depending on installation requirements. Features Agrement Certified: Independently certified for reliable third-party accreditation and performance. NHBC Compliant: Complies with NHBC Foundation’s NF94 guidance, suitable for Type A and Type B membrane applications. VOC Protection: Meets CIRIA C748:2014 standards, providing robust volatile organic compound protection. Methane & CO₂ Resistance: Conforms to BS 8485:2015 + A1:2019 for effective methane and carbon dioxide protection. Radon & Damp Proofing: Offers additional protection against radon and serves as a damp proof membrane. Versatile Jointing Options: Lap joints can be taped or heat welded, allowing for flexible installation to meet specifications.