Waterproof membranes are materials designed to prevent water from passing through them. They are commonly used in construction to protect buildings from moisture damage. These membranes can be made from various materials, including rubber, plastic, and bitumen, and are often applied to roofs, basements, and foundations. In addition to construction, waterproof membranes are also used in other applications, such as in clothing and footwear to keep the wearer dry. They work by creating a barrier that allows moisture vapor to escape while blocking liquid water, making them effective in various environments and conditions.