The APP membrane, which stands for Atactic Polypropylene Membrane, is a specialized waterproofing material made from bitumen. It is available in rolls, each measuring 10 meters by 1 meter and covering an area of 8.7 m². When applied with proper craftsmanship, the APP membrane provides an effective and long-lasting waterproofing solution commonly used in various construction projects. It is particularly suitable for concrete flat roofs or roofs with a low pitch. Additionally, its applications extend to concrete gutters, basements, and retaining walls.