Waterproofing sheet, also known as geotextile membrane. By convention, geotextile membranes with a thickness of ≥0.8mm are called waterproofing sheets, while those with a thickness of 0.8mm are simply called geotextile membranes. They are made from high molecular polymer materials and serve as a waterproofing material, available in two types: homogeneous waterproofing sheets and composite waterproofing sheets.