The Taipei MRT system is a large-scale underground construction. Our company has been involved in many water-proofing and water seal tenders, and has worked with large construction companies, like Rong Engineering Co Ltd, NewAsia Construction, B+B, US McKay, BES Engineering Corporation, Pan Asia Corporation, Continental Engineering Corp, and others, to provide leakage sealing services.Leakage in this project included continual wall leakage, structural cracks, cold seam leakage, honeycomb leakage, expansion joint leakage, station structure leakage, ring sheets leakage, etc. In response to these different conditions, grout used included ultra-micro cement, single-component polyimide resin, two-component type polyurethane resin, silicate resin and the like.