Waterproof membrane is primarily used for building walls, roofs, and places like tunnels, highways, and landfill sites. It is a flexible building material product that can be rolled into rolls, designed to resist external rainfall and groundwater leakage. Acting as a non-leakage connection between the engineering foundation and the building, it serves as a barrier against water leakage in the entire project, playing a crucial role in the overall waterproofing.