Visqueen Gas Vent Mat VT M1

Visqueen Gas Vent Mat VT M1 is a geocomposite void former comprising a cuspated HDPE core bonded to a nonwoven polypropylene geotextile filter membrane. Laid beneath reinforced concrete ground floor slabs, it creates a 25mm deep void through which hazardous ground gases, including methane, carbon dioxide, radon and volatile organic compounds, are collected and dispersed to atmosphere via a designed arrangement of Visqueen connectors and venting components.

Where high gas concentrations have been recorded, the mat is laid in blanket format with individual mats butted together. Where concentrations are lower or pressure relief is the priority, it is laid in strip format at predetermined spacings, reducing material use without compromising performance.

Benefits

• Large format rolls allow rapid installation across large slab areas
• Reduces the volume of contaminated soil requiring removal compared to traditional pipe and gravel venting systems
• Compatible with a full range of Visqueen system components for exhausting collected gases to atmosphere

Good to know 

• Achieves between 0.5 and 1.5 points when assessed to BS 8485:2015+A1:2019
• Where high gas concentrations have been recorded, the mat is laid in blanket format with individual mats butted together.
• Where concentrations are lower or pressure relief is the priority, it is laid in strip format at predetermined spacings, reducing material use without compromising performance.