A base sheet is a type of roofing membrane that is used as the foundation layer for the installation of other roofing materials. Base sheets are typically made from asphalt-saturated felt or other materials, and are installed over the roof deck to provide a strong and stable base for additional layers of roofing materials.
Base sheets can be used with a variety of roofing systems, including built-up roofing, modified bitumen roofing, and single-ply roofing systems. The sheet is typically fastened to the roof deck with nails or other mechanical fasteners, and is covered with additional layers of roofing materials, such as hot asphalt or other adhesives, to create a complete roofing system.
The base sheet is an important component of the overall roof system, as it provides a secure and stable base for the additional layers of roofing materials. The sheet also helps to prevent water infiltration and other types of damage, and can improve the overall durability and performance of the roof system.
Proper installation and maintenance of the base sheet, along with regular inspections and repairs, can help to ensure the continued durability and performance of the roof system. The sheet must be properly integrated with other roof components, such as flashings and drainage systems, and must be installed in a way that provides a secure and watertight seal against water infiltration and other types of damage.