TREMproof® Dual Waterproofing System (DWS) is a dual membrane waterproofing system comprised of TREMproof TRA sheeting embedded into TREMproof 250GC. This unique waterproofing system is designed to have tenacious adhesion, long term durability, and remarkable chemical stability. The elastomeric properties of the system’s components enable the complete assembly to withstand the most demanding waterproofing needs.