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Preprufe® Pre-applied Waterproofing Membranes are unique multi-layered composite waterproofing sheets made from a thick solar reflective HDPE film, a highly aggressive pressure sensitive adhesive and a weather resistant protective coating that allows freshly poured concrete to fully adhere to the membrane to prevent water tracking. Unlike some conventional membranes that are vulnerable to water penetration at junctions and penetrations, the unique Preprufe® seal with the concrete prevents any entry or migration of moisture around the structure from hydrostatic pressure or ground contamination.