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Protecto-drain 20 is a 1mm thick HDPE membrane for large-scale tanking and sealing projects. Its 20mm cup size allows more groundwater to pass through, making it ideal for lining bridges, tunnels, and various civil engineering works. Flexible and easy to install, this membrane handles large water volumes effortlessly. HDPE material ensures no water pollution, enabling water to be directed, managed, and recycled safely. Protecto-drain 20 offers a cost-effective water management solution compared to expensive systems by redirecting water and preventing hydrostatic pressure points. Its "egg-box" profile prevents blockages, allowing greater water flow and easing sealing by clipping sheets in place with adhesive tape. In vertical applications, it excels as a waterproofing layer between concrete layers. Wallbarn Protecto-Drain 20 is available in 20m x 2m size.. Wallbarn Protecto-Drain 20 Drainage Membrane 20m x 2m Black