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TREMproof® 3700 HD is a pre-applied, fully bonded HDPE membrane which integrally bonds when concrete is poured on it. It consists of a multi-layer composite waterproofing material for superior performance, including a layer of thick HDPE film, a self-adhesive polymer layer, and a unique particulate layer. TREMproof® 3700 HD is a composite sheet designed for below-ground waterproofing of concrete structures. Once installed, it creates an integrally bonded, high-performance waterproofing and protection layer for below-ground concrete structures against groundwater, contaminants, and ground gases.