Twist Lock

TWIST LOCK is a high-performance, fully bonded composite sheet membrane engineered for blindside waterproofing in pre-applied below-grade waterproofing systems. It consists of a proprietary elastomeric bitumen formulation reinforced with a dimensionally stable double-layer composite. The top surface is coated with specially engineered silicon dioxide crystals, ensuring a uniform bond to structural concrete, resistance to hydrostatic pressure, and prevention of lateral water migration. The underside is laminated with a thermofusible synthetic film. The membrane’s distinctive design, featuring DUO SELVEDGE technology, enables precise alignment of 120mm side laps, of which 30% is self-adhesive. The remaining 70% is covered with a thermofusible plastic film, allowing side laps to be sealed via heat welding with a propane torch.