Waterproof sheet, also known as geotextile membrane. Conventionally, a geotextile membrane with a thickness of ≥0.8mm is called a waterproof sheet, while a 0.8mm-thick one is simply called a geotextile membrane. It is a type of waterproofing material made from basic high molecular polymer raw materials, and is categorized into homogeneous waterproof sheets and composite waterproof sheets.