Sheet membranes are thin layers of material used in construction to provide waterproofing and protection against moisture. They are typically made from materials like rubber, plastic, or bitumen and are applied to surfaces such as roofs, walls, and foundations. These membranes create a barrier that prevents water from penetrating, helping to protect buildings from damage. Installation of sheet membranes is usually done by adhering them to surfaces with adhesives or by using mechanical fasteners. They are available in various sizes and thicknesses, making them suitable for different applications. Proper installation is crucial to ensure their effectiveness in preventing leaks and moisture-related issues.